Arduino Mega

Pin 2 (PWM/INT4) -> Encoder Right A
Pin 3 (PWM/INT5) -> Encoder Right B
Pin 4 (+ GND) -> Tirette
Pin 5 (+ GND) -> Switch Side Select (Yellow/Purple)
Pin 6 (PWM) -> Vacuum Pump Right
Pin 7 (PWM) -> Vacuum Pump Left
Pin 8 (PWM) -> Motor Right Forward
Pin 9 (PWM) -> Motor Right Backward
Pin 10 (PWM) -> Motor Right PWM
Pin 11 (PWM) -> Motor Left Forward
Pin 12 (PWM) -> Motor Left Backward
Pin 13 (PWM) -> Motor Left PWM
Pin 14 (TX3) -> (<-> Nano 8 (SoftwareSerial RX))
Pin 15 (RX3) -> (<-> Nano 9 (SoftwareSerial TX))
Pin 16 (TX2) -> Data XL320
Pin 17 (RX2) ->
Pin 18 (TX1) -> Data AX-12A
Pin 19 (RX1) ->
Pin 20 (SDA/INT1) -> Encoder Left A
Pin 21 (SCL/INT0) -> Encoder Left B
Pin 54/A0 (ADC) -> Status Led Red
Pin 55/A1 (ADC) -> Status Led Green
Pin 56/A2 (ADC) -> Status Led Blue
Pin 57/A3 (ADC) -> Current Shunt Vaccum Pump Right
Pin 58/A4 (ADC) -> Current Shunt Vaccum Pump Left

GPIO with GND & 5V: 59/A5 | 69/A15

Arduino Nano

Pin 0 (RX) ->
Pin 1 (TX) ->
Pin 2 (INT0) ->
Pin 3 (INT1/PWM) ->
Pin 4 -> Sonar 0 Trigger
Pin 5 (PWM) -> Sonar 0 Echo
Pin 6 (PWM) -> Sonar 1 Trigger
Pin 7 -> Sonar 1 Echo
Pin 8 -> Sonar 2 Trigger
Pin 9 (PWM) -> Sonar 2 Echo
Pin 10 (SS/PWM) -> Sonar 3 Trigger
Pin 11 (MOSI/PWM) -> Sonar 3 Echo
Pin 12 (MISO) ->
Pin 13 (SCK) ->
Pin 14/A0 (ADC) -> SoftwareSerial RX (<-> Mega 14 (TX3))
Pin 15/A1 (ADC) -> SoftwareSerial TX (<-> Mega 15 (RX3))
Pin 16/A2 (ADC) ->
Pin 17/A3 (ADC) ->
Pin 18/A4 (ADC/SDA) -> SDA LCD Display
Pin 19/A5 (ADC/SCL) -> SCL LCD Display
Pin A6 (ADC only) ->
Pin A7 (ADC only) ->