| Arduino Pin | AVR Pin | Alternative Funktion | Interrupt | Timer | Sonstiges |
| D0 | PD0 | RXD | PCINT16 | | verbunden mit USB-UART Interface Chip (CH340G oder FTDI) |
| D1 | PD1 | TXD | PCINT17 | | verbunden mit USB-UART Interface Chip (CH340G oder FTDI) |
| D2 | PD2 | | PCINT18/INT0 | | |
| D3 | PD3 | | PCINT19/INT1 | OC2B | IR-TX für Arduino-IRremote |
| D4 | PD4 | | PCINT20 | T0 | |
| D5 | PD5 | | PCINT21 | OC0B/T1 | |
| D6 | PD6 | | PCINT22 | OC0A | |
| D7 | PD7 | | PCINT23 | | |
| D8 | PB0 | | PCINT0 | ICP1 | |
| D9 | PB1 | | PCINT1 | OC1A | |
| D10 | PB2 | SS | PCINT2 | OC1B | |
| D11 | PB3 | MOSI | PCINT3 | OC2A | IR-RX für Arduino-IRremote |
| D12 | PB4 | MISO | PCINT4 | | |
| D13 | PB5 | SCK | PCINT5 | | verbunden mit on-board LED |
| A0/D14 | PC0 | | PCINT8 | | |
| A1/D15 | PC1 | | PCINT9 | | |
| A2/D16 | PC2 | | PCINT10 | | |
| A3/D17 | PC3 | | PCINT11 | | |
| A4/D18 | PC4 | SDA | PCINT12 | | |
| A5/D19 | PC5 | SCL | PCINT13 | | |
| A6 | ADC6 | | | | |
| A7 | ADC7 | | | | |
