7. AVR Pin Assignment Table Sorted by Function

 Function   Pin 
digital I/Os (x16) PB0, PB1, PB2, PB4, PB5,
PC0, PC1, PC2, PC3, PC4, PC5,
PD0, PD1, PD2, PD4, PD7
analog inputs (x8) PC0, PC1, PC2, PC3, PC4, PC5, ADC6, ADC7
motor 1 control (A and B) PD5 and PD6
motor 2 control (A and B) PD3 and PB3
red user LED PD1
user trimmer potentiometer ADC7
ISP programming lines (x3) PB3, PB4, PB5
RESET PC6
UART (RX and TX) PD0 and PD1
I2C/TWI (SDA and SCL) PC4 and PC5
SPI inaccessable to user
Timer1 PWM outputs (A and B) PB1 and PB2