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6. AVR Pin Assignment Table Sorted by Function
| Function | ATmega324/1284 Pin |
|---|---|
| free analog input and digital I/O (x8) | PA0 – PA7 |
| free digital I/O (x8) | PB3, PC0, PC1, PD0 – PD4, PD5** |
| free digital output | PB4* |
| free PWM outputs (x2) | PB3, PB4 |
| red user LED | PD1 |
| green user LED | PC4 |
| UART0 | PD0, PD1 |
| UART1 | PD2, PD3 |
| user pushbuttons (bottom to top, x3) | PC2, PC3, PC5 |
| motor 1 (direction, speed) | PC7, PD7 |
| motor 2 (direction, speed) | PC6, PD6 |
| buzzer | PD4 |
| LCD control (RS, R/W, E) | PB0, PB1, PB2 |
| LCD data (4-bit: DB4 – DB7) | PC2 – PC5 |
| SPI auxiliary processor control lines (x3) | PB5, PB6, PB7 |
| ICSP programming lines (x3) | PB5, PB6, PB7 |
| ADC reference pin | AREF |
| reset pushbutton | RESET |
*: Using PB4/SS as an input will interfere with communication to the auxiliary processor, so we recommend using it as a digital output. See Section 3.j of the Pololu USB AVR C/C++ User’s Guide for more information.
**: PD5 is a free digital I/O unless you want to use the built-in servo pulse hardware.
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