Embedded Lab

I²C or IIC (Inter-Integrated Circuit) is a simple bidirectional serial interface, which requires only 2 signal lines for data transfer. It was originally developed by Philips in 1980′s to provide easy on-board communications between a CPU and various peripheral chips in a TV set. Today, it is widely used in varieties of embedded systems to connect many low speed peripherals, such as external EEPROMs, sensors, LCD drivers, port expanders, real-time clocks, etc, to the host microcontroller. In this tutorial, we will explore the chipKIT Wire Library for establishing an I²C communication link between the chipKIT Uno32 board and two I²C sensors. The Uno32 board receives the sensor outputs through the I²C link and displays the results on the serial monitor window on the computer screen.

I2C communication demo