| Board | AVR | DIGITAL | ANALOG | PWM | SERIAL, SPI, I2C, INTERRUPT, Power |
|---|---|---|---|---|---|
| Power | |||||
| RESET | PC6 | ||||
| Analog | |||||
| A0 | PC0 | 14 | A0 | ||
| A1 | PC1 | 15 | A1 | ||
| A2 | PC2 | 16 | A2 | ||
| A3 | PC3 | 17 | A3 | ||
| A4 | PC4 | 18 | A4 | I2C: SDA | |
| A5 | PC5 | 19 | A5 | I2C: SCL | |
| Digital | |||||
| 0 | PD0 | 0 | SERIAL: RX | ||
| 1 | PD1 | 1 | SERIAL: TX | ||
| 2 | PD2 | 2 | INTERRUPT: INT0 | ||
| 3 | PD3 | 3 | PWM | INTERRUPT: INT1 | |
| 4 | PD4 | 4 | |||
| 5 | PD5 | 5 | PWM | ||
| 6 | PD6 | 6 | PWM | ||
| 7 | PD7 | 7 | |||
| 8 | PB0 | 8 | |||
| 9 | PB1 | 9 | PWM | ||
| 10 | PB2 | 10 | PWM | SPI: SS | |
| 11 | PB3 | 11 | PWM | SPI: MOSI | |
| 12 | PB4 | 12 | SPI: MISO | ||
| 13 | PB5 | 13 | SPI: SCK | ||