| Pin | Description | Use |
|---|---|---|
| 1 | V_IN | No Connection |
| 2 | GND | Ground |
| 3 | PC6/RST | No Connection |
| 4 | +5V | +5V |
| 5 | A7 | J1 - BRK_3 |
| 6 | A6 | LED 2 (Doesn't work - can't drive LED from Analog Pin) |
| 7 | A5/D19 | LED 1 |
| 8 | A4 | LED EXT |
| 9 | A3 | Current - 5V |
| 10 | A2 | Current - Vcc |
| 11 | A1 | Latch Off |
| 12 | A0 | Voltage - Vcc |
| 13 | A_REF | No Connection |
| 14 | +3V3 | No Connection |
| 15 | PC5/D13 | SPI - SCLK |
| 16 | D1/TX/PD1 | UART Tx |
| 17 | D0/RX/PD0 | UART Rx |
| 18 | RST/PC6 | Reset |
| 19 | GND | Ground |
| 20 | D2 | ARD_GPIO_AUX |
| 21 | D3 | PWM - ESC |
| 22 | D4 | J1 - BRK_2 |
| 23 | D5 | PWM - Rudder |
| 24 | D6 | PWM - Stbd ELev |
| 25 | D7 | J1 - BRK_1 |
| 26 | D8 | Actuator Fault |
| 27 | D9 | PWM - Port Elev |
| 28 | D10 | Actuator Enable |
| 29 | D11 | SPI - CIPO |
| 30 | D12 | SPI - PICO |
| Pin | Description | Use |
|---|---|---|
| 1 | GND | Ground |
| 2 | BRK_1 | Arduino D7 |
| 3 | BRK_2 | Arduino D4 |
| 4 | BRK_3 | Arduino A7 |
| Pin | Description |
|---|---|
| 1 | +5V |
| 2 | LED EXT |
| 3 | GND |
| Indicator | Description |
|---|---|
| D2 | User available output from Arduino |
| D7 | 5 V Rail is active |
| D8 | 3.3 V Rail is active |

| Pin | Description | Notes |
|---|---|---|
| GPIO6 | Arduino Reset | |
| GPIO10 | IMU Embedded Reset | |
| GPIO23 | IMU Retrofit Reset | |
| GPIO26 | XBee Reset |
| Indicator | Description |
|---|---|
| D1 | Raspberry Pi Compute Module Power |
| D2 | User available output from Pi (GPIO24) |
| D3 | Raspberry Pi Compute Module Activity |

| Pin | Description |
|---|---|
| 1 | GND_RF |
| 2 | XBEE_SPI_CS |
| 3 | XBEE_SPI_CLK |
| 4 | XBEE_SPI_POCI |
| 5 | XBEE_SPI_CIPO |
| Address | Device |
|---|---|
| 0x28 | Adafruit IMU Breakout - Bosch BNO055 |
| 0x64 | Atlas Scientific EC-OEM Salinity Sensor |
| 0x76 | Blue Robotics Bar30 Pressure Sensor |
| 0x42 | uBlox NEO-M8M-0 GPS |