Pinout

Digital I/O pin
Analog input or
digital I/O pin
I²C pin
5V
Vin (7.45 V)
Ground
On the Uno R3,
and SCL is a duplicate of analog pin 5 (A5).
On the Leonardo, SDA is a duplicate of digital pin 2
and SCL is a duplicate of digital pin 3.
SDA is a duplicate of analog pin 4 (A4)
SDA
SDA
SCL
SCL
A0
A0
A0
A5 A5
A5
A1
A1 A1
A1
A4
A4
A4
A4
A1
A2
A2
A2
A2
A3
A3
A3
A3
2
2 2
2
11
11 11
11
4 4
4 4
5 5
5
5
Vin
Vin
A4
5V 5V 5V
5V
5V
5V
5V
5V 5V
5V
5V
5V
GND GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
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www.pololu.com
Pololu Zumo Shield for Arduino
Front expansion pinout