added kick-start for small motor control signals

micropython_firmware/d1motor.py

@@ -10,6 +10,10 @@ m0.speed(5000)
 
 """
 import ustruct
+import utime
+import math
+
+sign = lambda x: math.copysign(1, x)
 
 
 _STATE_BRAKE = const(0)
@@ -49,6 +53,10 @@ class Motor:
     def speed(self, speed=None):
         if speed is None:
             return self._speed
+        if abs(speed) < 30 and abs(speed) > 10: # kick-start for small speeds
+            self.speed(int(100 * sign(speed)))
+            utime.sleep_ms(5)
+
         if speed > 0:
             self._speed = min(10000, max(1, speed))
             self._state = _STATE_RIGHT