5. Arduino pin assignment table

Digital pins Zumo Shield function Notes/alternate functions
0digital I/ORX for programming and serial communication on Uno and older Arduinos
1digital I/OTX for programming and serial communication on Uno and older Arduinos
2digital I/O (front expansion)I²C SDA on Leonardo
3digital I/Ooptional jumper to buzzer control line for Uno and older Arduinos
I²C SCL on Leonardo
4digital I/O (front expansion)
5digital I/O (front expansion)
6digital I/Ooptional jumper to buzzer control line for Leonardo
7right motor direction control line
8left motor direction control line
9right motor PWM control line
10left motor PWM control line
11digital I/O (front expansion)
12digital I/Ouser pushbutton (pressing pulls low)
13digital I/Oyellow user LED (high turns LED on)
Analog pins Zumo Shield function Notes/alternate functions
A0analog input and digital I/O (front expansion)
A1analog input and digital I/O (front expansion)optional jumper to battery level voltage divider
A2analog input and digital I/O (front expansion)
A3analog input and digital I/O (front expansion)
A4analog input and digital I/O (front expansion)I²C SDA on Uno and older Arduinos
A5analog input and digital I/O (front expansion)I²C SCL on Uno and older Arduinos