| Name | I/O | Description |
|---|---|---|
| RST | Reset | |
| VIN | Power Input | 5V~12V Input Power |
| 3.3V | Power Output | 3.3V 500mA Max. |
| 5V | Power Output | 5V 500mA Max. |
| AREF | ADC reference voltage | |
| P0 | I/O | |
| P1 | I/O | |
| P2 | I/O | |
| P3 | I/O | PWM3 |
| P4 | I/O | PWM4 |
| P5 | I/O | PWM5 |
| P6 | I/O | |
| P7 | I/O | |
| P8 | I/O | |
| P9 | I/O | |
| P10 | I/O | |
| P11 | I/O | |
| P12 | I/O | |
| P13 | I/O | |
| P14 | I/O | |
| P15 | I/O | |
| P16 | I/O | ADC0 : AD Channel 0 |
| P17 | I/O | ADC1 : AD Channel 1 |
| P18 | I/O | ADC2 : AD Channel 2 |
| P19 | I/O | ADC3 : AD Channel 3 |
| P20 | I/O | ADC4 : AD Channel 4 |
| P21 | I/O | ADC5 : AD Channel 5 |