units
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@ -16,7 +16,7 @@ On the top side of the PCB you will find a lot of `U`-shaped markings in with `D
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The top side of the diodes shows a vertical line followed by the letters T4, i.e. it looks like `|T4`.
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The diode has to be solder to the PCB such that the vertical line is on the closed side of the `U`-marking.
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Solder in all 37 diodes that way.
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Diodes `D1-D36` are in the center of the PCB, diode `D73` is $\approx 4$cm right of the MCU.
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Diodes `D1-D36` are in the center of the PCB, diode `D73` is $\approx 4\,\mathrm{cm}$ right of the MCU.
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## Testing the keyboard
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@ -64,7 +64,7 @@ The LEDs are also very sensitive to temperature, so be careful when soldering th
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### Picking a position for the solder jumper / picking a voltage for the first LED
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Turn the keyboard around once more, such that you can no longer see the swords and the MCU is facing away from you.
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#### Background
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Approximately 3cm to the right side of the MCU you will find a solder-jumper.
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Approximately $3\,\mathrm{cm}$ to the right side of the MCU you will find a solder-jumper.
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It is used to pick between two possible voltages powering the first LED of the backlight.
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The datalines of the backlight-LEDs are not specified to work with the 3.3V supplied by the MCU, when the LEDs are driven by (the standard) 5V.
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However usually they do still work in that scenario.
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