The following table describes the pins available on the Arduino board, and their purpose in the Kegboard firmware.
| Pin | Description |
|---|---|
| 2 | Flowmeter 0 input |
| 3 | Flowmeter 1 input |
| 4 | Flow 0 LED output |
| 5 | Flow 1 LED output |
| 6 | ID-12 RFID input |
| 7 | Thermo OneWire bus |
| 8 | Presence OneWire bus |
| 9 | GPIO pin C |
| 10 | ID-12 RFID reset output |
| 11 | Buzzer output |
| 12 | Test pulse output |
| 13 | Alarm output |
| A0 | Relay 0 output |
| A1 | Relay 1 output |
| A2 | Relay 2 output |
| A3 | Relay 3 output |
| A4 | GPIO pin A |
| A5 | GPIO pin B |