This module includes an arduino sketch designed to run on the ESP32.

The sketch takes simple input from serial (ESP32 microusb port), and converts the input to a duty cycle that can be used on servos.

The protocol specification is as follows, assuming an array of bytes:


| Byte Number   | Value Description |
| :---------- |  ----------: |
| 0 | 0 if Calibrating a servo. Higher values indicates channel number to set duty cycle on. |
| 1 | If byte 0 = 0: number of servos to calibrate. Else, the new duty cycle value for the channel specified in byte 0. |

The table below describes the byte format for calibrating a servo. This array of bytes can be repeated for the given number of servos in byte 1:

| Byte Number   | Value Description |
| :----------   |  ----------:      |
| 0             | Servo channel to set (this will be byte 0 when setting duty cycle, so don't use 0). |
| 1             | The pin number to setup |
| 2             | The frequency for the pin |

The min/max pulse widths are hardcoded to 1000us/2000us respectively. 

At the end of each loop, the entire array will be read, to flush any data that may cause issues later.