| Port | Pin | Arduino Mask | Bertha V4.4 | |
|---|---|---|---|---|
| D | 2 | D0 / RX | RX D1/AIN1/INT2 | |
| D | 3 | D1 / TX | TXD1/INT3 | Memory CS |
| D | 1 | D2 / SDA | SDA/INT1 | I2C SDA |
| D | 0 | D3 / SCL | OC0B/SCL/INT0 | I2C SCL |
| D | 4 | D4 / A6 | ICP1/ADC8 | IO3 |
| C | 6 | D5 (PWM) | OC3A/#0C4A | IO2 / PWM food OUT |
| D | 7 | D6 (PWM) | T0/OC4D/ADC10 | PID on PWM |
| E | 6 | D7 | PE6 (INT.6/AIN0) | Ext. OneWire 1 |
| B | 4 | D8 / A8 | ADC11/PCINT4 | Stepper direction |
| B | 5 | D9 / A9 | PCINT5/OC1A/#OC4B/ADC12 | Stepper step |
| B | 6 | D10 / A10 | PCINT6/OC1B/OC4B/ADC13 | IO1 / PWM food IN |
| B | 7 | D11 (PWM) | PCINT7/OC0A/OC1C/#RTS | FAN control |
| D | 6 | D12 / A11 | T1/#OC4D/ADC9 | IO4 |
| C | 7 | D13 (PWM) | ICP3/CLK0/)0C4A | Blink Led |
| B | 3 | MISO / D14 | PDO/PCINT3/MISO | Memory MISO |
| B | 1 | SCK / D15 | PCINT1/SCLK | Memory SCK |
| B | 2 | MOSI / D16 | PDI/PCINT2/MOSI | Memory MOSI |
| B | 0 | RXLED / SS / D17 | SS/PCINT0 | RXLED |
| F | 7 | A0 / D18 | ADC7/TDI | CLK HX711 |
| F | 6 | A1 / D19 | ADC6/TDO | Data HX711 |
| F | 5 | A2 / D20 | ADC5/TMS | OneWire PCB |
| F | 4 | A3 / D21 | ADC4/TCK | |
| F | 1 | A4 / D22 | ADC1 | |
| F | 0 | A5 / D23 | ADC0 | Ext. OneWire 2 |
| D | 5 | TXLED / D30 | XCK1/#CTS | TXLED |
| E | 2 | HWB | HWB |