Datasheet

Solder these 4 pins too, since you're good at it now this

should be easy.

Bi-Color Bargraph LED Backpack Wiring & Firmware

We wrote a basic library to help you work with the bi-color bargraph backpack. The library is written for the Arduino

and will work with any Arduino as it just uses the I2C pins. The code is very portable and can be easily adapted to any

I2C-capable micro.

Wiring to the bargraph is really easy

Connect SCL to the I2C clock - on Arduino UNO thats Analog #5, on the Leonardo its Digital #3, on the Mega its

digital #21

Connect SDA to the I2C data - on Arduino UNO thats Analog #4, on the Leonardo its Digital #2, on the Mega its