Created Variant USART (markdown)

Candas1
2020-11-21 12:16:53 +01:00
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This variant can be used to control the board from another board(e.g. Arduino, ESP32, ESP8266,RASPBERRY PI) or a computer via a serial protocol.<br />
The example [Arduino sketch](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/tree/master/Arduino/hoverserial) will send commands and process the feedback.
## Wiring:
* Connect blue wire to RX, blue wire to TX and black wire to GND of Arduino on right sensor cable(shorter)
⚠ Red wire from sensor cable delivers 15v !!!
Use 3.3v from programming port, 5v from hall sensor cable, or a voltage regulator.
## Calibration:
Proceed with [calibration](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/wiki/Calibration) for better control if you use input devices(e.g. Joystick or Throttle handle) on the Arduino.
## Troubleshooting:
If the board is beeping
* Make sure the baud rate is 38400
* Make sure you are using the sensor cable(left=USART2 or right=USART3) selected in config.h
* On some boards the wire colors might differ, try switching blue and green wires