got mpc controller running again

remote_control/aruco_estimator.py

@@ -4,39 +4,163 @@ import cv2
 import os
 import time
 import math
+from pyqtgraph.Qt import QtCore, QtGui
+from pyqtgraph.parametertree import Parameter, ParameterTree, parameterTypes
+import pyqtgraph as pg
+
 
 from shapely.geometry import LineString
 from queue import Queue
 
 import aruco
 
+class FPSCounter:
+    def __init__(self):
+        self.fps_start_time = time.time()
+        self.fps_counter = 0
+        self.fps_display_rate = 1.0
+
+    def get_fps(self):
+        self.fps_counter += 1
+        delta_t = time.time() - self.fps_start_time
+        if delta_t > self.fps_display_rate:
+            self.fps_counter = 0
+            self.fps_start_time = time.time()
+        return self.fps_counter / delta_t
+
+## test add/remove
+## this group includes a menu allowing the user to add new parameters into its child list
+class RobotMarkerGroup(parameterTypes.GroupParameter):
+    def __init__(self, **opts):
+        opts['type'] = 'group'
+        opts['addText'] = "Add Marker"
+        opts['addList'] = ['Robot']
+        parameterTypes.GroupParameter.__init__(self, **opts)
+
+    def addNew(self, typ):
+        current_robots = self.children()
+        current_indices = [int(r.name().split(' ')[1]) for r in current_robots]
+        new_index = len(current_indices) + 1
+        val = 0
+        self.addChild(dict(name=f"Robot {new_index}", type='int', value=val, removable=False,
+                           renamable=True))
+
+class CornerMarkerGroup(parameterTypes.GroupParameter):
+    def __init__(self, **opts):
+        opts['type'] = 'group'
+        opts['addText'] = "Add Marker"
+        opts['addList'] = ['Corner']
+        parameterTypes.GroupParameter.__init__(self, **opts)
+
+    def addNew(self, typ):
+        current_corners = self.children()
+        current_chars = [str(r.name().split(' ')[1]) for r in current_corners]
+        new_char = chr(ord(current_chars[-1]) + 1)
+        val = 0
+        self.addChild(dict(name=f"Corner {new_char}", type='int', value=val, removable=False))
+
 
 class ArucoEstimator:
-    corner_marker_ids = {
-        'a': 0,
-        'b': 1,
-        'c': 2,
-        'd': 3
-    }
-
-    corner_estimates = {
-        'a': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
-        'b': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
-        'c': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
-        'd': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
-    }
-
     def __init__(self, robot_marker_ids=None, use_realsense=True, grid_columns=8, grid_rows=8):
+        self.app = QtGui.QApplication([])
+
+        ## Create window with GraphicsView widget
+        self.win = QtGui.QWidget()
+        self.layout = QtGui.QGridLayout()
+        self.win.setLayout(self.layout)
+
+        self.win.keyPressEvent = self.handleKeyPressEvent
+        self.win.setWindowTitle('ArucoEstimator')
+
+        self.plotwidget = pg.PlotWidget()
+        self.layout.addWidget(self.plotwidget)
+
+        ## lock the aspect ratio so pixels are always square
+        self.plotwidget.setAspectLocked(True)
+        self.plotwidget.getPlotItem().getAxis('left').hide()
+        self.plotwidget.getPlotItem().getAxis('bottom').hide()
+
+        ## Create image item
+        self.img = pg.ImageItem(border='w')
+        self.img.setLevels([[0, 255], [0, 255], [0, 255]])
+        self.img.mouseClickEvent = self.handleMouseEvent
+        self.plotwidget.addItem(self.img)
+
+        # fps display
+        self.fps_counter = FPSCounter()
+        self.fps_overlay = pg.TextItem('fps = 0', color=(255, 255, 0), anchor=(0,1))
+        self.plotwidget.addItem(self.fps_overlay)
+
+        self.invert_grayscale = True
+        self.draw_grid = False
+        self.draw_markers = True
+        self.draw_marker_coordinate_system = False
+        self.corner_marker_size = 0.075
+        self.corner_marker_ids = {
+            'a': 0,
+            'b': 1,
+            'c': 2,
+            'd': 3
+        }
+        self.corner_estimates = {
+            'a': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
+            'b': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
+            'c': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
+            'd': {'pixel_coordinate': None, 'x': None, 'y': None, 'n_estimates': 0},
+        }
         self.grid_columns = grid_columns
         self.grid_rows = grid_rows
 
+        self.robot_marker_size = 0.07
         if robot_marker_ids is None:
             robot_marker_ids = []
         self.robot_marker_ids = robot_marker_ids
         self.robot_marker_estimates = dict([(marker_id, {'t': None, 'x': None, 'y': None, 'angle': None})
                                             for marker_id in self.robot_marker_ids])
 
-        self.draw_grid = False
+        robot_marker_group = [{'name': f'Robot {ind}', 'type': 'int', 'value': marker_id} for ind, marker_id in
+                              enumerate(self.robot_marker_ids, 1)]
+        corner_marker_group = [{'name': f'Corner {letter}', 'type': 'int', 'value': marker_id} for letter, marker_id in
+                                self.corner_marker_ids.items()]
+
+        self.threshold = 10.0
+
+        # parameter
+        params_spec = [
+            {'name': 'Corner marker size', 'type': 'float', 'value': self.corner_marker_size, 'siPrefix': True,
+             'suffix': 'm', 'limits': (0.01, 1), 'step': 0.001},
+            {'name': 'Robot marker size', 'type': 'float', 'value': self.robot_marker_size, 'siPrefix': True,
+             'suffix': 'm', 'limits': (0.01, 1), 'step': 0.001},
+            {'name': 'Draw markers', 'type': 'bool', 'value': self.draw_markers},
+            {'name': 'Draw marker coordinate system', 'type': 'bool', 'value': self.draw_marker_coordinate_system},
+            {'name': 'Threshold', 'type': 'float', 'value': self.threshold},
+            {'name': 'Invert grayscale', 'type': 'bool', 'value': self.invert_grayscale, 'tip': "Invert grayscale image before marker detection"},
+            {'name': 'Show FPS', 'type': 'bool', 'value': True, 'tip': "Display frames per second counter"},
+            {'name': 'Draw grid', 'type': 'bool', 'value': self.draw_grid, 'tip': "Draw grid spanned by the markers 0 - 3"},
+            {'name': 'Grid columns', 'type': 'int', 'value': self.grid_columns, 'tip': "Number of columns for the grid"},
+            {'name': 'Grid rows', 'type': 'int', 'value': self.grid_rows, 'tip': "Number of rows for the grid"},
+            {'name': 'Display mode', 'type': 'list', 'values': ['color', 'grayscale'], 'value': 'color', 'tip': "Display mode for the video"},
+            {'name': 'Autoexposure', 'type': 'bool', 'value': True},
+            RobotMarkerGroup(name="Robot markers", children=robot_marker_group),
+            CornerMarkerGroup(name="Corner markers", children=corner_marker_group),
+            ]
+        self.params = Parameter.create(name='params', type='group', children=params_spec)
+        self.params.param('Invert grayscale').sigValueChanged.connect(lambda _, v: self.__setattr__('invert_grayscale', v))
+        self.params.param('Threshold').sigValueChanged.connect(lambda _, v: self.__setattr__('threshold', v))
+        self.params.param('Draw markers').sigValueChanged.connect(lambda _, v: self.__setattr__('draw_markers', v))
+        self.params.param('Draw marker coordinate system').sigValueChanged.connect(lambda _, v: self.__setattr__('draw_marker_coordinate_system', v))
+        self.params.param('Draw grid').sigValueChanged.connect(lambda _, v: self.__setattr__('draw_grid', v))
+        self.params.param('Grid columns').sigValueChanged.connect(lambda _, v: self.__setattr__('grid_columns', v))
+        self.params.param('Grid rows').sigValueChanged.connect(lambda _, v: self.__setattr__('grid_rows', v))
+        self.params.param('Corner marker size').sigValueChanged.connect(lambda _, v: self.__setattr__('corner_marker_size', v))
+        self.params.param('Robot marker size').sigValueChanged.connect(lambda _, v: self.__setattr__('robot_marker_size', v))
+        self.params.param('Show FPS').sigValueChanged.connect(lambda _, v: self.fps_overlay.show() if v else self.fps_overlay.hide())
+        self.params.param('Autoexposure').sigValueChanged.connect(lambda _, v: self.set_autoexposure(v))
+
+        self.paramtree = ParameterTree()
+        self.paramtree.setParameters(self.params, showTop=False)
+        self.layout.addWidget(self.paramtree)
+        self.win.show()  ## show widget alone in its own window
 
         self.event_queue = Queue()
 
@@ -50,9 +174,8 @@ class ArucoEstimator:
             # Start streaming
             self.pipeline.start(config)
 
-            # disable auto exposure
+            # enable auto exposure
-            color_sensor = self.pipeline.get_active_profile().get_device().query_sensors()[1]
+            self.set_autoexposure(self.params['Autoexposure'])
-            color_sensor.set_option(rs.option.enable_auto_exposure, False)
 
             camera_intrinsics = self.pipeline.get_active_profile().get_stream(
                 rs.stream.color).as_video_stream_profile().get_intrinsics()
@@ -69,16 +192,13 @@ class ArucoEstimator:
             self.pipeline = None
 
         # create detector and get parameters
-        self.detector = aruco.MarkerDetector()
-        self.detector.setDetectionMode(aruco.DM_VIDEO_FAST, 0.05)
-
-        self.detector_params = self.detector.getParameters()
 
         # print detector parameters
-        print("detector params:")
+        # print("detector params:")
-        for val in dir(self.detector_params):
+        # print(self.detector_params)
-            if not val.startswith("__"):
+        # for val in dir(self.detector_params):
-                print("\t{} : {}".format(val, self.detector_params.__getattribute__(val)))
+        #     if not val.startswith("__"):
+        #         print("\t{} : {}".format(val, self.detector_params.__getattribute__(val)))
 
         self.camparam = aruco.CameraParameters()
         if use_realsense:
@@ -90,6 +210,12 @@ class ArucoEstimator:
         self.drag_line_start = None
         self.previous_click = None
 
+    def set_autoexposure(self, v):
+        if self.pipeline is not None:
+            color_sensor = self.pipeline.get_active_profile().get_device().query_sensors()[1]
+            color_sensor.set_option(rs.option.enable_auto_exposure, v)
+            print(color_sensor.get_option(rs.option.enable_auto_exposure))
+
     def compute_clicked_position(self, px, py):
         if self.all_corners_detected():
             # inter/extrapolate from clicked point to marker position
@@ -116,21 +242,16 @@ class ArucoEstimator:
             target = np.array([px, -py])
         return target
 
-    def mouse_callback(self, event, px, py, flags, param):
+    def handleMouseEvent(self, event):
-        """
+        # get click position as distance to top-left corner of the image
-        This function is called for each mouse event inside the opencv window.
+        px = event.pos().x()
-        If there are reference markers available we compute the real world position corresponding to the clicked
+        py = self.img.height() - event.pos().y()
-        position and put it in an event queue.
+        print(f"px = {px}, py = {py}")
-        :param event: type of event (mouse movement, left click, right click, etc.)
+        if event.button() == QtCore.Qt.MouseButton.LeftButton:
-        :param px: x-position of event
+#            self.drag_line_start = (px, py)
-        :param py: y-position of event
+#        elif event == cv2.EVENT_LBUTTONUP:
-        """
-        target = None
-
-        if event == cv2.EVENT_LBUTTONDOWN:
-            self.drag_line_start = (px, py)
-        elif event == cv2.EVENT_LBUTTONUP:
             self.drag_line_end = (px, py)
+            self.drag_line_start = (px, py)
             target_pos = self.compute_clicked_position(self.drag_line_start[0], self.drag_line_start[1])
             if self.drag_line_start != self.drag_line_end:
                 # compute target angle for clicked position
@@ -155,105 +276,91 @@ class ArucoEstimator:
             if self.drag_line_start is not None:
                 self.drag_line_end = (px, py)
 
-    def run_tracking(self, draw_markers=True, draw_marker_coordinate_system=False, invert_grayscale=False):
+    def process_frame(self):
-        """
+        if self.pipeline:
-        Run the marker tracking in a loop
+            frames = self.pipeline.wait_for_frames()
-        """
+            color_frame = frames.get_color_frame()
-        cv2.namedWindow('RoboRally', cv2.WINDOW_AUTOSIZE)
-        cv2.setMouseCallback('RoboRally', self.mouse_callback)
 
-        fps_display_rate = 1  # displays the frame rate every 1 second
+            # Convert images to numpy arrays
-        fps_counter = 0
+            color_image = np.asanyarray(color_frame.get_data())
-        start_time = time.time()
+        else:
-        try:
+            # Capture frame-by-frame
-            running = True
+            ret, color_image = self.cv_camera.read()
-            while running:
+        t_image = time.time()
-                if self.pipeline:
+
-                    frames = self.pipeline.wait_for_frames()
+        gray = cv2.cvtColor(color_image, cv2.COLOR_BGR2GRAY)
-                    color_frame = frames.get_color_frame()
+        if self.invert_grayscale:
-                    if not color_frame:
+            cv2.bitwise_not(gray, gray)
-                        continue
+
-                    # Convert images to numpy arrays
+        detector = aruco.MarkerDetector()
-                    color_image = np.asanyarray(color_frame.get_data())
+        detector.setDetectionMode(aruco.DM_VIDEO_FAST, 0.01)
+
+        #detector_params = detector.getParameters()
+
+        # run aruco marker detection
+        detected_markers = detector.detect(gray)
+#        detected_markers2 = detector.detect(gray)
+        #gray = detector.getThresholdedImage()
+
+        display_mode = self.params.param('Display mode').value()
+
+        #print(f"detected_markers = {[marker.id for marker in detected_markers]}")
+        #print("threshold = ", self.threshold)
+
+        # extract data for detected markers
+        detected_marker_data = {}
+        for marker in detected_markers:
+            if marker.id >= 0:
+                detected_marker_data[marker.id] = {'marker_center': marker.getCenter()}
+
+                if marker.id in self.corner_marker_ids.values():
+                    marker.calculateExtrinsics(self.corner_marker_size, self.camparam)
                 else:
-                    # Capture frame-by-frame
+                    marker.calculateExtrinsics(self.robot_marker_size, self.camparam)
-                    ret, color_image = self.cv_camera.read()
+                detected_marker_data[marker.id]['Rvec'] = marker.Rvec
-                t_image = time.time()
+                detected_marker_data[marker.id]['Tvec'] = marker.Tvec
 
-                gray = cv2.cvtColor(color_image, cv2.COLOR_BGR2GRAY)
+                if self.draw_markers:
-                if invert_grayscale:
+                    marker.draw(color_image, np.array([255, 255, 255]), 2, True)
-                    cv2.bitwise_not(gray, gray)
 
-                # run aruco marker detection
+                if self.draw_marker_coordinate_system:
-                detected_markers = self.detector.detect(gray)
+                    aruco.CvDrawingUtils.draw3dAxis(color_image, self.camparam, marker.Rvec, marker.Tvec, .1)
 
-                # extract data for detected markers
+        # store data
-                detected_marker_data = {}
+        for marker_id, data in detected_marker_data.items():
-                for marker in detected_markers:
+            self.update_estimate(marker_id, data['marker_center'], data['Rvec'], data['Tvec'], t_image)
-                    if marker.id >= 0:
-                        detected_marker_data[marker.id] = {'marker_center': marker.getCenter()}
 
-                        if marker.id in self.corner_marker_ids.values():
+        # draw grid
-                            marker.calculateExtrinsics(0.075, self.camparam)
+        if self.draw_grid:
-                        else:
+            color_image = self.draw_grid_lines(color_image, detected_marker_data)
-                            marker.calculateExtrinsics(0.07, self.camparam)
+        color_image = self.draw_robot_pos(color_image, detected_marker_data)
-                        detected_marker_data[marker.id]['Rvec'] = marker.Rvec
-                        detected_marker_data[marker.id]['Tvec'] = marker.Tvec
 
-                        if draw_markers:
+        # draw drag
-                            marker.draw(color_image, np.array([255, 255, 255]), 2, True)
+        if self.drag_line_start is not None and self.drag_line_end is not None:
+            color_image = cv2.line(color_image, self.drag_line_start, self.drag_line_end, color=(0, 0, 255), thickness=2)
 
-                        if draw_marker_coordinate_system:
+        # compute frame rate
-                            aruco.CvDrawingUtils.draw3dAxis(color_image, self.camparam, marker.Rvec, marker.Tvec, .1)
+        self.fps_overlay.setText(f"fps = {self.fps_counter.get_fps():.1f}")
 
-                # store data
+        # Show images
-                for marker_id, data in detected_marker_data.items():
+        color_image_rgb = cv2.cvtColor(color_image, cv2.COLOR_BGR2RGB)  # convert to RGB
-                    self.update_estimate(marker_id, data['marker_center'], data['Rvec'], data['Tvec'], t_image)
+        if display_mode == 'color':
+            self.img.setImage(np.transpose(np.flipud(color_image_rgb), axes=(1, 0, 2)))
+        elif display_mode == 'grayscale':
+            self.img.setImage(np.transpose(np.flipud(gray)))
 
-                # draw grid
+        QtCore.QTimer.singleShot(1, self.process_frame)
-                if self.draw_grid:
-                    color_image = self.draw_grid_lines(color_image, detected_marker_data)
-                color_image = self.draw_robot_pos(color_image, detected_marker_data)
 
-                # draw drag
+    def handleKeyPressEvent(self, ev):
-                if self.drag_line_start is not None and self.drag_line_end is not None:
+        key = ev.key()
-                    color_image = cv2.line(color_image, self.drag_line_start, self.drag_line_end, color=(0, 0, 255), thickness=2)
+        self.event_queue.put(('key', key))
-
+        if key == QtCore.Qt.Key_Q:
-                # compute frame rate
-                fps_counter += 1
-                delta_t = time.time() - start_time
-                if delta_t > fps_display_rate:
-                    fps_counter = 0
-                    start_time = time.time()
-                color_image = cv2.putText(color_image, f"fps = {(fps_counter / delta_t):.2f}", (10, 25), cv2.FONT_HERSHEY_PLAIN, 2,
-                                          (0, 255, 255),
-                                          thickness=2)
-
-                # Show images
-                cv2.imshow('RoboRally', color_image)
-                key = cv2.waitKey(1)
-
-                if key > 0:
-                    self.event_queue.put(('key', key))
-                    if key == ord('g'):
-                        self.draw_grid = not self.draw_grid
-                    if key == ord('q'):
-                        running = False
-                    if key == ord('x'):
-                        color_sensor = self.pipeline.get_active_profile().get_device().query_sensors()[1]
-                        if color_sensor.get_option(rs.option.enable_auto_exposure) == 1.0:
-                            color_sensor.set_option(rs.option.enable_auto_exposure, False)
-                            print("auto exposure OFF")
-                        else:
-                            color_sensor.set_option(rs.option.enable_auto_exposure, True)
-                            print("auto exposure ON")
-                    if key == ord('i'):
-                        invert_grayscale = not invert_grayscale
-        finally:
-            cv2.destroyAllWindows()
             if self.pipeline is not None:
                 # Stop streaming
                 self.pipeline.stop()
+            self.app.quit()
+        elif key == QtCore.Qt.Key_I:
+            self.invert_grayscale = not self.invert_grayscale
 
     def update_estimate(self, marker_id, pixel_coord_center, rvec, tvec, t_image):
         # update the marker estimate with new data
@@ -377,7 +484,7 @@ class ArucoEstimator:
         corner_1_center = self.corner_estimates[corner_1]['pixel_coordinate']
         corner_2_center = self.corner_estimates[corner_2]['pixel_coordinate']
         if corner_1_center is not None and corner_2_center is not None:
-            frame = cv2.line(frame, tuple(corner_1_center), tuple(corner_2_center), color=(0, 0, 255), thickness=2)
+            frame = cv2.line(frame, tuple(corner_1_center.astype(int)), tuple(corner_2_center.astype(int)), color=(0, 0, 255), thickness=2)
         return frame
 
     def draw_grid_lines(self, frame, detected_marker_data):
@@ -400,7 +507,7 @@ class ArucoEstimator:
             for x in range(1, self.grid_columns):
                 column_line_top = a + x / self.grid_columns * vab
                 column_line_bottom = d + x / self.grid_columns * vdc
-                frame = cv2.line(frame, tuple(column_line_top), tuple(column_line_bottom), color=(0, 255, 0),
+                frame = cv2.line(frame, tuple(column_line_top.astype(int)), tuple(column_line_bottom.astype(int)), color=(0, 255, 0),
                                  thickness=1)
 
             # draw horizontal lines
@@ -409,7 +516,7 @@ class ArucoEstimator:
             for y in range(1, self.grid_rows):
                 row_line_top = a + y / self.grid_rows * vad
                 row_line_bottom = b + y / self.grid_rows * vbc
-                frame = cv2.line(frame, tuple(row_line_top), tuple(row_line_bottom), color=(0, 255, 0),
+                frame = cv2.line(frame, tuple(row_line_top.astype(int)), tuple(row_line_bottom.astype(int)), color=(0, 255, 0),
                                  thickness=1)
 
         return frame
@@ -446,4 +553,9 @@ class ArucoEstimator:
 
 if __name__ == "__main__":
     estimator = ArucoEstimator(use_realsense=True, robot_marker_ids=[11, 12, 13, 14])
-    estimator.run_tracking(draw_markers=True, invert_grayscale=True)
+    estimator.process_frame()
+
+    import sys
+
+    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+        QtGui.QApplication.instance().exec_()

remote_control/control_commander.py

@@ -3,19 +3,40 @@ import time
 
 from robot import ControlledRobot
 from pid_controller import PIDController
+from mpc_controller import MPCController
 from event_listener import EventListener
 
 
 class CommanderBase:
-    def __init__(self):
+    valid_controller_types = {'pid': PIDController,
-        self.robots = []
+                              'mpc': MPCController}
-        self.robots = [ControlledRobot(12, '10.10.11.91')]  # , Robot(13, '192.168.1.13'), Robot(14, '192.168.1.14')]
-        # self.robots = [ControlledRobot(marker_id=13, ip='10.10.11.90'),
-        # ControlledRobot(marker_id=14, ip='10.10.11.89')]
 
-        for r in self.robots:
+    def __init__(self, id_ip_dict, controller_type='pid'):
+        """
+
+        :param id_ip_dict: dictionary containing robot marker id and ip of the robot, e.g. { 12: '10.10.11.91' }
+        :param controller_type: string 'pid', 'mpc'; or dictionary with robot id and controller type string, e.g. { 12: 'mpc', 13: 'pid'}
+        """
+        self.robots = {}
+        for id, ip in id_ip_dict.items():
+            self.robots[id] = ControlledRobot(id, ip)
+
+        for id, r in self.robots.items():
             r.connect()
-            r.attach_controller(PIDController())
+
+        if type(controller_type) == dict:
+            for id, ctype in controller_type.items():
+                if ctype in CommanderBase.valid_controller_types:
+                    self.robots[id].attach_controller(CommanderBase.valid_controller_types[ctype]())
+                else:
+                    raise Exception(f"invalid controller type {ctype} specified for robot {id}. "
+                                    f"valid controller types are {list(CommanderBase.valid_controller_types.keys())}")
+        elif controller_type in CommanderBase.valid_controller_types:
+            for id, r in self.robots.items():
+                r.attach_controller(CommanderBase.valid_controller_types[controller_type]())
+        else:
+            raise Exception(f"invalid controller type {controller_type} specified. valid controller types are "
+                            f"{list(CommanderBase.valid_controller_types.keys())}")
 
         self.event_listener = EventListener(event_server=('127.0.0.1', 42424))
 
@@ -24,14 +45,14 @@ class CommanderBase:
         self.running = False
 
     def run(self):
-        unconnected_robots = list(filter(lambda r: not r.connected, self.robots))
+        unconnected_robots = list(filter(lambda r: not r.connected, self.robots.values()))
         if len(unconnected_robots) > 0:
             print(f"warning: could not connect to the following robots: {unconnected_robots}")
             return
 
         all_detected = False
         while not all_detected:
-            undetected_robots = list(filter(lambda r: None in r.get_measurement(), self.robots))
+            undetected_robots = list(filter(lambda r: None in r.get_measurement(), self.robots.values()))
             all_detected = len(undetected_robots) == 0
             if not all_detected:
                 print(f"warning: no measurements available for the following robots: {undetected_robots}")
@@ -50,23 +71,25 @@ class CommanderBase:
         if event[0] == 'click':
             target = event[1]
             target_pos = np.array([target['x'], target['y'], target['angle']])
-            self.robots[self.current_robot_index].move_to_pos(target_pos)
+            controlled_robot_id = list(self.robots.keys())[self.current_robot_index]
+            self.robots[controlled_robot_id].move_to_pos(target_pos)
         elif event[0] == 'key':
             key = event[1]
             if key == 32:  # arrow up
                 self.controlling = not self.controlling
                 if not self.controlling:
                     print("disable control")
-                    for r in self.robots:
+                    for _, r in self.robots.items():
                         r.stop_control()
                 else:
                     print("enable control")
-                    for r in self.robots:
+                    for _, r in self.robots.items():
                         r.start_control()
             elif key == 9:  # TAB
                 # switch controlled robot
                 self.current_robot_index = (self.current_robot_index + 1) % len(self.robots)
-                robot = self.robots[self.current_robot_index]
+                controlled_robot_id = list(self.robots.keys())[self.current_robot_index]
+                robot = self.robots[controlled_robot_id]
                 print(f"controlled robot: {robot.id}")
             elif key == 113 or key == 27:  # q or ESCAPE
                 print("quit!")
@@ -76,5 +99,15 @@ class CommanderBase:
 
 
 if __name__ == '__main__':
-    rc = CommanderBase()
+    id_ip_dict = {
+        #11: '10.10.11.88',
+        #12: '10.10.11.91',
+        #13: '10.10.11.90',
+        14: '10.10.11.89',
+    }
+
+    # controller_type = {12: 'mpc', 13: 'pid'}
+    controller_type = 'mpc'
+
+    rc = CommanderBase(id_ip_dict, controller_type=controller_type)
     rc.run()

remote_control/controller.py

@@ -18,10 +18,11 @@ class ControllerBase:
 
                 control = self.compute_control(state)
 
-                self.apply_control(control)
+                if self.controlling:
+                    self.apply_control(control)
 
-                time.sleep(self.control_rate)
+        if self.robot is not None:
-        self.apply_control((0.0, 0.0))   # stop robot
+            self.robot.send_cmd(u1=0, u2=0)   # stop robot
 
     def set_target_position(self, target_pos):
         self.target_pos = target_pos
@@ -42,6 +43,7 @@ class ControllerBase:
         else:
             raise Exception("error: controller cannot apply control!\n"
                             "       there is no robot attached to the controller!")
+        time.sleep(self.control_rate)
 
     def attach_robot(self, robot):
         self.robot = robot

remote_control/manual_controller.py

@@ -0,0 +1,62 @@
+import socket
+import pygame
+from argparse import ArgumentParser
+
+class ManualController:
+    def __init__(self, estimator):
+        self.estimator = estimator
+        self.estimator.external_keyboard_callback = self.handle_keypress
+
+        self.controlling = False
+
+    def handle_keypress(self, key):
+        pass
+
+parser = ArgumentParser()
+parser.add_argument('ip', metavar='ip', type=str, help='ip address of the controlled robot')
+args = parser.parse_args()
+
+ip = args.ip
+
+pygame.init()
+pygame.display.set_mode((640, 480))
+
+rc_socket = socket.socket()
+try:
+    rc_socket.connect((ip, 1234)) # connect to robot
+except socket.error:
+    print("could not connect to socket")
+
+running = True
+while running:
+    u1 = 0
+    u2 = 0
+    vmax = 1.0
+    events = pygame.event.get()
+    for event in events:
+        if event.type == pygame.KEYDOWN:
+            if event.key == pygame.K_LEFT:
+                u1 = -vmax 
+                u2 = vmax
+                print(f"turn left: ({u1},{u2})")
+            elif event.key == pygame.K_RIGHT:
+                u1 = vmax
+                u2 = -vmax
+                print(f"turn right: ({u1},{u2})")
+            elif event.key == pygame.K_UP:
+                u1 = vmax
+                u2 = vmax
+                print(f"forward: ({u1},{u2})")
+            elif event.key == pygame.K_DOWN:
+                u1 = -vmax 
+                u2 = -vmax 
+                print(f"backward: ({u1},{u2})")
+            elif event.key == pygame.K_ESCAPE:
+                print("quit")
+                running = False
+                u1 = 0.0
+                u2 = 0.0
+            rc_socket.send(f'({u1},{u2})\n'.encode())
+        elif event.type == pygame.KEYUP:
+            print("key released, resetting: ({},{})".format(u1, u2))
+            rc_socket.send(f'({u1},{u2})\n'.encode())

remote_control/measurement_server.py

@@ -22,7 +22,13 @@ class MeasurementHandler(socketserver.BaseRequestHandler):
                     self.request.sendall((json.dumps(event) + '\n').encode())
                     self.server.estimator.last_event = None
                 time.sleep(1.0 / self.server.max_measurements_per_second)
-
+        elif 'corners' in data.decode():
+            # send positions of the board markers
+            corner_estimates = self.server.estimator.corner_estimates
+            response = {}
+            for corner, data in corner_estimates.items():
+                response[corner] = {'x': data['x'], 'y': data['y']}
+            self.request.sendall((json.dumps(response) + '\n').encode())
         else:
             # send robot position
             try:
@@ -57,12 +63,23 @@ class MeasurementServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
 
 
 if __name__ == "__main__":
-    aruco_estimator = ArucoEstimator(use_realsense=True, robot_marker_ids=[11, 12, 13, 14])
+    aruco_estimator = ArucoEstimator(use_realsense=True, robot_marker_ids=[12, 13])
-    estimator_thread = threading.Thread(target=aruco_estimator.run_tracking, kwargs={'invert_grayscale': True})
-    estimator_thread.start()
 
-    with MeasurementServer(('0.0.0.0', 42424), MeasurementHandler, aruco_estimator,
+    # first we start thread for the measurement server
-                           max_measurements_per_second=30) as measurement_server:
+    measurement_server = MeasurementServer(('0.0.0.0', 42424), MeasurementHandler, aruco_estimator, max_measurements_per_second=30)
-        measurement_server.serve_forever()
+    server_thread = threading.Thread(target=measurement_server.serve_forever)
+    server_thread.start()
+
+    # now we start the Aruco estimator GUI
+    aruco_estimator.process_frame()
+    import sys
+    from pyqtgraph.Qt import QtCore, QtGui
+
+    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+        QtGui.QApplication.instance().exec_()
+
+    #with MeasurementServer(('0.0.0.0', 42424), MeasurementHandler, aruco_estimator,
+    #                       max_measurements_per_second=30) as measurement_server:
+    #    measurement_server.serve_forever()
 
     # receive with: nc 127.0.0.1 42424  -> 12 + Enter

remote_control/mensaabend.py

@@ -0,0 +1,117 @@
+from flask import Flask, render_template, request
+
+import socket
+import threading
+import time
+import numpy as np
+
+from robot import Robot
+
+from mpc_controller import MPCController
+from aruco_estimator import ArucoEstimator
+
+from shapely.geometry import LineString
+
+width = 600
+height = 400
+
+robot_ids = [11, 12, 13, 14]
+robot_ids_control_history = [11, 12, 13, 14]
+
+app = Flask(__name__)
+
+def calc_target_pos(px, py):
+    if rc.estimator.all_corners_detected():
+        # compute column line
+        a = np.array([rc.estimator.corner_estimates['a']['x'], rc.estimator.corner_estimates['a']['y']])
+        b = np.array([rc.estimator.corner_estimates['b']['x'], rc.estimator.corner_estimates['b']['y']])
+        c = np.array([rc.estimator.corner_estimates['c']['x'], rc.estimator.corner_estimates['c']['y']])
+        d = np.array([rc.estimator.corner_estimates['d']['x'], rc.estimator.corner_estimates['d']['y']])
+        x_frac = (px + 0.5) / width
+        y_frac = (py + 0.5) / height
+
+        vab = b - a
+        vdc = c - d
+        column_line_top = a + x_frac * vab
+        column_line_bottom = d + x_frac * vdc
+
+        vad = d - a
+        vbc = c - b
+        row_line_top = a + y_frac * vad
+        row_line_bottom = b + y_frac * vbc
+
+        column_line = LineString([column_line_top, column_line_bottom])
+        row_line = LineString([row_line_top, row_line_bottom])
+
+        int_pt = column_line.intersection(row_line)
+        point_of_intersection = np.array([int_pt.x, int_pt.y, 0.0])
+
+        return point_of_intersection
+
+
+@app.route('/', methods=('GET', 'POST'))
+def presence():
+    global robot_ids_control_history
+    if request.method == 'GET':
+        return render_template('telepresence.html', oldest_control=robot_ids.index(robot_ids_control_history[0]))
+    elif request.method == 'POST':
+        x = int(float(request.form.get('x')))
+        y = int(float(request.form.get('y')))
+        print(x, y)
+        margin = 0.1
+        x = min(max(width * margin, x), width * (1 - margin))
+        y = min(max(height * margin, y), height * (1 - margin))
+
+        id = int(request.form.get('robot'))
+        robot_ids_control_history.append(robot_ids_control_history.pop(robot_ids_control_history.index(id)))
+
+        target_pos = calc_target_pos(x, y)
+        rc.estimator.event_queue.put(('robot', id, target_pos))
+
+        return 'OK'
+
+
+class RemoteController:
+    def __init__(self):
+        self.robots = []
+        #self.robots = [Robot(11, '192.168.1.11')] #, Robot(13, '192.168.1.13'), Robot(14, '192.168.1.14')]
+        self.robots = [Robot(11, '10.10.11.88'), Robot(12, '10.10.11.91'),
+                       Robot(13, '10.10.11.90'), Robot(14, '10.10.11.89')]
+
+        self.robot_ids = {}
+        for r in self.robots:
+            self.robot_ids[r.id] = r
+
+        # socket for movement commands
+        self.comm_socket = socket.socket()
+        self.comm_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+
+        for robot in self.robots:
+            robot.connect()
+
+        self.comm_socket.bind(('', 1337))
+        self.comm_socket.listen(5)
+
+        self.t = time.time()
+
+        # start thread for marker position detection
+        self.estimator = ArucoEstimator(self.robot_ids.keys())
+        self.estimator_thread = threading.Thread(target=self.estimator.run_tracking, kwargs={'draw_markers':False})
+        self.estimator_thread.start()
+
+        self.controller = MPCController(self.estimator)
+
+    def run(self):
+        print("waiting until all markers are detected...")
+        while not (self.estimator.all_corners_detected() and self.estimator.all_robots_detected()):
+            pass
+        print("starting control")
+        self.controller.interactive_control(robots=self.robots)
+
+
+if __name__ == "__main__":
+    rc = RemoteController()
+    rc_thread = threading.Thread(target=rc.run)
+    rc_thread.start()
+
+    app.run('0.0.0.0')

remote_control/mpc_controller.py

@@ -1,175 +1,62 @@
 import numpy as np
 import time
 
+from controller import ControllerBase
 from casadi_opt import OpenLoopSolver
 
 
-class MPCController:
+class MPCController(ControllerBase):
-    def __init__(self, estimator):
+    def __init__(self, N=20, T=1.0):
-        self.t = time.time()
+        super().__init__()
+        self.t = None
 
-        self.estimator = estimator
+        self.ols = OpenLoopSolver(N=N, T=T)
-        self.controlling = False
+        self.ols.setup()
+        self.control_rate = self.ols.T / self.ols.N
 
         self.mstep = 2
-        self.ols = OpenLoopSolver(N=20, T=1.0)
-        self.ols.setup()
-        self.dt = self.ols.T / self.ols.N
 
         # integrator
         self.omega_max = 5.0
-        self.control_scaling = 0.4
+        self.control_scaling = 0.5
 
-    def move_to_pos(self, target_pos, robot, near_target_counter=5):
+    def set_target_position(self, target_pos):
-        near_target = 0
+        super(MPCController, self).set_target_position(target_pos)
-        while near_target < near_target_counter:
+        self.t = time.time()
-            while not self.estimator.event_queue.empty():
-                event = self.estimator.event_queue.get()
-                print("event: ", event)
-                if event[0] == 'click':
-                    pass
-                elif event[0] == 'key':
-                    key = event[1]
 
-                    if key == 84:  # arrow up
+    def compute_control(self, state):
-                        self.controlling = True
+        x_pred = np.array(state[1:])
-                        self.t = time.time()
-                    elif key == 82:  # arrow down
-                        self.controlling = False
-                        robot.send_cmd()
-                    elif key == 48:  # 0
-                        target_pos = np.array([0.0, 0.0, 0.0])
-                    elif key == 43:  # +
-                        self.control_scaling += 0.1
-                        self.control_scaling = min(self.control_scaling, 1.0)
-                        print("control scaling = ", self.control_scaling)
-                    elif key == 45:  # -
-                        self.control_scaling -= 0.1
-                        self.control_scaling = max(self.control_scaling, 0.1)
-                        print("control scaling = ", self.control_scaling)
-                    elif key == 113:
-                        print("quit!")
-                        self.controlling = False
-                        robot.send_cmd()
-                        return
-                    elif key == 27:  # escape
-                        print("quit!")
-                        self.controlling = False
-                        robot.send_cmd()
-                        return
 
-            x_pred = self.get_measurement(robot.id)
+        error_pos = np.linalg.norm(x_pred[0:2] - self.target_pos[0:2])
+        angles_unwrapped = np.unwrap([x_pred[2], self.target_pos[2]])  # unwrap angle to avoid jump in data
+        error_ang = np.abs(angles_unwrapped[0] - angles_unwrapped[1])
 
-            if x_pred is not None:
+        if error_pos > 0.05 or error_ang > 0.2:
-                error_pos = np.linalg.norm(x_pred[0:2] - target_pos[0:2])
+        #if error_pos > 0.05:
-                angles_unwrapped = np.unwrap([x_pred[2], target_pos[2]])  # unwrap angle to avoid jump in data
+            # solve mpc open loop problem
-                error_ang = np.abs(angles_unwrapped[0] - angles_unwrapped[1])
+            res = self.ols.solve(x_pred, self.target_pos)
-                # print("error pos = ", error_pos)
-                # print("error_pos = {}, error_ang = {}".format(error_pos, error_ang))
 
-                # if error_pos > 0.075 or error_ang > 0.35:
+            us1 = res[0] * self.control_scaling
-                if error_pos > 0.05 or error_ang > 0.1:
+            us2 = res[1] * self.control_scaling
-                    # solve mpc open loop problem
-                    res = self.ols.solve(x_pred, target_pos)
 
-                    # us1 = res[0]
+            dt_mpc = time.time() - self.t
-                    # us2 = res[1]
+            if dt_mpc < self.control_rate:  # wait until next control can be applied
-                    us1 = res[0] * self.control_scaling
+                time.sleep(self.control_rate - dt_mpc)
-                    us2 = res[1] * self.control_scaling
+        else:
-                    # print("u = {}", (us1, us2))
+            us1 = [0] * self.mstep
+            us2 = [0] * self.mstep
 
-                    # print("---------------- mpc solution took {} seconds".format(tmpc_end - tmpc_start))
+        return us1, us2
-                    dt_mpc = time.time() - self.t
-                    if dt_mpc < self.dt:  # wait until next control can be applied
-                        # print("sleeping for {} seconds...".format(self.dt - dt_mpc))
-                        time.sleep(self.dt - dt_mpc)
-                else:
-                    us1 = [0] * self.mstep
-                    us2 = [0] * self.mstep
-                    near_target += 1
 
-                # send controls to the robot
+    def apply_control(self, control):
-                for i in range(0, self.mstep):  # option to use multistep mpc if len(range) > 1
+        if self.robot is not None:
-                    u1 = us1[i]
+            for i in range(0, self.mstep):  # option to use multistep mpc if len(range) > 1
-                    u2 = us2[i]
+                u1 = control[0][i]
-                    robot.send_cmd(u1, u2)
+                u2 = control[1][i]
-                    if i < self.mstep:
+                self.robot.send_cmd(u1, u2)
-                        time.sleep(self.dt)
+                if i < self.mstep:
-                    self.t = time.time()  # save time the most recent control was applied
+                    time.sleep(self.control_rate)
-            else:
+                self.t = time.time()  # save time the most recent control was applied
-                print("robot not detected yet!")
+        else:
-
+            raise Exception("error: controller cannot apply control!\n"
-    def interactive_control(self, robots):
+                            "       there is no robot attached to the controller!")
-        controlled_robot_number = 0
-        robot = robots[controlled_robot_number]
-
-        target_pos = np.array([0.0, 0.0, 0.0])
-
-        running = True
-        while running:
-            # handle events from opencv window
-            while not self.estimator.event_queue.empty():
-                event = self.estimator.event_queue.get()
-                print("event: ", event)
-                if event[0] == 'click':
-                    target_pos = event[1]
-                elif event[0] == 'key':
-                    key = event[1]
-
-                    if key == 32:  # arrow up
-                        self.controlling = not self.controlling
-                        if not self.controlling:
-                            print("disable control")
-                            robot.send_cmd()  # stop robot
-                        else:
-                            print("enable control")
-                            self.t = time.time()
-                    elif key == 48:  # 0
-                        target_pos = np.array([0.0, 0.0, 0.0])  # TODO: use center of board for target pos
-                    elif key == 43:  # +
-                        self.control_scaling += 0.1
-                        self.control_scaling = min(self.control_scaling, 1.0)
-                        print("control scaling = ", self.control_scaling)
-                    elif key == 45:  # -
-                        self.control_scaling -= 0.1
-                        self.control_scaling = max(self.control_scaling, 0.1)
-                        print("control scaling = ", self.control_scaling)
-                    elif key == 9:  # TAB
-                        # switch controlled robot
-                        robot.send_cmd()  # stop current robot
-                        controlled_robot_number = (controlled_robot_number + 1) % len(robots)
-                        robot = robots[controlled_robot_number]
-                        print(f"controlled robot: {robot.id}")
-                    elif key == 113 or key == 27:  # q or ESCAPE
-                        print("quit!")
-                        self.controlling = False
-                        robot.send_cmd()
-                        return
-
-            if self.controlling:
-                # measure state
-                x_pred = self.get_measurement(robot.id)
-
-                # print(np.linalg.norm(x_pred-target_pos))
-
-                # solve mpc open loop problem
-                res = self.ols.solve(x_pred, target_pos)
-
-                us1 = res[0] * self.control_scaling
-                us2 = res[1] * self.control_scaling
-
-                dt_mpc = time.time() - self.t
-                if dt_mpc < self.dt:  # wait until next control can be applied
-                    time.sleep(self.dt - dt_mpc)
-
-                # send controls to the robot
-                for i in range(0, self.mstep):  # option to use multistep mpc if len(range) > 1
-                    u1 = us1[i]
-                    u2 = us2[i]
-                    robot.send_cmd(u1, u2)
-                    if i < self.mstep:
-                        time.sleep(self.dt)
-                    self.t = time.time()  # save time the most recent control was applied
-
-    def get_measurement(self, robot_id):
-        return self.estimator.get_robot_state_estimate(robot_id)

remote_control/mpc_test.py

@@ -3,17 +3,32 @@ import socket
 import threading
 import time
 
-from robot import Robot
+from robot import Robot, ControlledRobot
 
 from mpc_controller import MPCController
 
-from aruco_estimator import ArucoEstimator
+# HOST, PORT = "localhost", 42424
+#
+# robot_id = 12
+#
+# sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+# sock.connect((HOST, PORT))
+# sock.sendall(f"{robot_id}\n".encode())     # request data for robot with given id
+# #sock.sendall(f"events\n".encode())        # request events
+# receiving = True
+# while receiving:
+#     received = str(sock.recv(1024), "utf-8")
+#     print("Received: {}".format(received))
+#     receiving = len(received) > 0
 
 
 class RemoteController:
     def __init__(self):
         self.robots = []
-        #self.robots = [Robot(11, '192.168.1.11'), Robot(13, '192.168.1.13'), Robot(14, '192.168.1.14')]
+        #self.robots = [Robot(11, '192.168.1.11')] #, Robot(13, '192.168.1.13'), Robot(14, '192.168.1.14')]
+        #self.robots = [Robot(12, '10.10.11.91'), Robot(13, '10.10.11.90'), Robot(14, '10.10.11.89')]
+        #self.robots = [Robot(14, '10.10.11.89')]
+        self.robots = [ControlledRobot(13, '192.168.1.13')]
 
         self.robot_ids = {}
         for r in self.robots:
@@ -32,18 +47,17 @@ class RemoteController:
         self.t = time.time()
 
         # start thread for marker position detection
-        self.estimator = ArucoEstimator(self.robot_ids.keys())
+        self.controller = MPCController()
-        self.estimator_thread = threading.Thread(target=self.estimator.run_tracking)
+        self.robots[0].attach_controller(self.controller)
-        self.estimator_thread.start()
-
-        self.controller = MPCController(self.estimator)
 
     def run(self):
-        print("waiting until all markers are detected...")
+        #print("waiting until all markers are detected...")
-        while not (self.estimator.all_corners_detected() and self.estimator.all_robots_detected()):
+        #while not (self.estimator.all_corners_detected() and self.estimator.all_robots_detected()):
-            pass
+        #    pass
         print("starting control")
-        self.controller.interactive_control(robots=self.robots)
+        #self.controller.interactive_control(robots=self.robots)
+        self.controller.start()
+        pass
 
 
 def main(args):
@@ -53,3 +67,13 @@ def main(args):
 
 if __name__ == '__main__':
     main(sys.argv)
+
+# to use the program, first start measurement_server.py, which launches the Aruco marker detection GUI and streams
+# marker positions and GUI events via socket
+# next, launch this program (mpc_test.py) in debug mode and set a breakpoint after self.controller.start()
+# you can now set the target position for the controlled robot via move_to_pos(), e.g.
+# self.robots[0].move_to_pos([0.0,0,0], True)
+
+# TODO
+# figure out how to get clicked positions from measurement server and drive robot there
+# also document and improve program structure

remote_control/pid_controller.py

@@ -10,8 +10,6 @@ class PIDController(ControllerBase):
         super().__init__()
         self.t = None
 
-        self.controlling = False
-
         self.P_angle = 0.4
         self.I_angle = 0.35
         self.D_angle = 0.1
@@ -46,7 +44,7 @@ class PIDController(ControllerBase):
         if self.t is None:
             dt = 0.1
         else:
-            dt = time.time() - self.t
+            dt = time.time() - self.t   # time since last control was applied
 
         if self.mode == 'angle':
             # compute angle such that robot faces to target point
@@ -108,9 +106,11 @@ class PIDController(ControllerBase):
 
                 self.e_pos_old = e_pos
                 self.e_angle_old = e_angle
-
         else:
             u1 = 0.0
             u2 = 0.0
-        self.t = time.time()  # save time when the most recent control was applied
         return u1, u2
+
+    def apply_control(self, control):
+        self.t = time.time()  # save time when the most recent control was applied
+        super(PIDController, self).apply_control(control)

remote_control/robot.py

@@ -1,7 +1,9 @@
 import socket
 import threading
 import json
-
+import numpy as np
+import time
+import math
 
 class Robot:
     def __init__(self, marker_id, ip, measurement_server=('127.0.0.1', 42424)):
@@ -123,8 +125,26 @@ class ControlledRobot(Robot):
         self.controller = controller
         self.controller.attach_robot(self)
 
-    def move_to_pos(self, target_pos):
+    def move_to_pos(self, target_pos, blocking=False):
         if self.controller is not None:
-            self.controller.set_target_position(target_pos)
+            if not blocking:
+                self.controller.set_target_position(target_pos)
+            else:   # only return after the robot has reached the target
+                self.stop_control()
+                self.controller.set_target_position(target_pos)
+                self.start_control()
+
+                close_to_target = False
+                while not close_to_target:
+                    current_pos = np.array([self.x, self.y, self.angle])
+                    v = target_pos - current_pos
+                    angles_unwrapped = np.unwrap([current_pos[2], target_pos[2]])  # unwrap angle to avoid jump in data
+                    e_angle = angles_unwrapped[0] - angles_unwrapped[1]  # angle difference
+                    e_pos = np.linalg.norm(v[0:2])
+                    print(f"e_pos = {e_pos}, e_ang = {e_angle}")
+                    close_to_target = e_pos < 0.05 and abs(e_angle) < 0.1
+                    time.sleep(0.1)
+                print("target reached!")
+                self.stop_control()
         else:
-            raise Exception("Error: Cannot move to position: there is not controller attached to the robot!")
+            raise Exception("Error: Cannot move to position: there is not controller attached to the robot!")

remote_control/templates/telepresence.html

@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <title>Mensa-Abend Telepräsenz</title>
+        <style>
+            div.meerschweinchen {
+                max-width: 600px;
+                margin: auto;
+                text-align: center;
+            }
+            div.arena {
+                height: 400px;
+                width: 600px;
+                background-image: url("https://p.0au.de/3d62ea7/foo.png");
+                border: none;
+                text-align: center;
+                position: relative
+            }
+            div.arena p {
+                margin: 0;
+                position: absolute;
+                top: 50%;
+                left: 50%;
+                transform: translate(-50%, -50%)
+            }
+        </style>
+
+        <script type=text/javascript src="{{url_for('static', filename='jquery-3.5.1.min.js') }}"></script>
+    </head>
+    <body>
+        <h1 style="text-align: center">Welcome to Mensa-Abend digital</h1>
+        <div style="text-align: center">
+            <p>Click anywhere to control the robots in our hackerspace. You can see them in the Zoom video.<br>
+                    <br>
+                    Please let us know about your study background.
+            </p>
+        </div>
+        <div class="meerschweinchen">
+            <div class=arena style="font-size: large;">
+
+            </div>
+
+            <form method="post">
+                <p>Choose your robot:</p>
+                <div>
+                  <input type="radio" id="r11" name="robot_id" value="11">
+                  <label for="r11">Robot 11</label>
+                </div>
+                <div>
+                  <input type="radio" id="r12" name="robot_id" value="12">
+                  <label for="r12">Robot 12</label>
+                </div>
+                <div>
+                  <input type="radio" id="r13" name="robot_id" value="13">
+                  <label for="r13">Robot 13</label>
+                </div>
+                <div>
+                  <input type="radio" id="r14" name="robot_id" value="14">
+                  <label for="r14">Robot 14</label>
+                </div>
+            </form>
+        </div>
+    </body>
+
+    <script>
+        function fireThis(e) {
+            var parentOffset = $(this).parent().offset();
+            var x = e.pageX - parentOffset.left;
+            var y = e.pageY - parentOffset.top;
+
+            var robot = document.querySelector('input[name = "robot_id"]:checked').value;
+
+            $.post( "/", { 'x': x, 'y': y , 'robot': robot} );
+        }
+
+        $('.arena').on('mousedown', fireThis);
+
+        function callRandom() {
+          var array = document.getElementsByName('robot_id');
+          array[{{ oldest_control }}].checked = true;
+        }
+        callRandom();
+    </script>
+</html>