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5. Arduino pin assignment table
| Digital pins | Zumo Shield function | Notes/alternate functions |
|---|---|---|
| 0 | digital I/O | RX for programming and serial communication on Uno and older Arduinos |
| 1 | digital I/O | TX for programming and serial communication on Uno and older Arduinos |
| 2 | digital I/O (front expansion) | I²C SDA on Leonardo and A-Star 32U4 Prime |
| 3 | digital I/O | optional jumper to buzzer control line for Uno and older Arduinos I²C SCL on Leonardo and A-Star 32U4 Prime |
| 4 | digital I/O (front expansion) | |
| 5 | digital I/O (front expansion) | |
| 6 | digital I/O | optional jumper to buzzer control line for Leonardo and A-Star 32U4 Prime |
| 7 | right motor direction control line | |
| 8 | left motor direction control line | |
| 9 | right motor PWM control line | |
| 10 | left motor PWM control line | |
| 11 | digital I/O (front expansion) | |
| 12 | digital I/O | user pushbutton (pressing pulls low) |
| 13 | digital I/O | yellow user LED (high turns LED on) |
| Analog pins | Zumo Shield function | Notes/alternate functions |
|---|---|---|
| A0 | analog input and digital I/O (front expansion) | |
| A1 | analog input and digital I/O (front expansion) | optional jumper to battery level voltage divider |
| A2 | analog input and digital I/O (front expansion) | |
| A3 | analog input and digital I/O (front expansion) | |
| A4 | analog input and digital I/O (front expansion) | I²C SDA on Uno and older Arduinos |
| A5 | analog input and digital I/O (front expansion) | I²C SCL on Uno and older Arduinos |
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