Raj of Embedded Lab has a series of chipKIT tutorials. This 5th project will show you how to build a digital stopwatch on seven segment LED display with the chipKIT Uno32:
In this project, we will use the chipKIT Uno32 board to build a digital stopwatch capable of timing minutes, seconds, and 1/10th of seconds, and with a basic start and stop control feature. A MAX7219-driven 8-digit seven segment LED display is used to display the time elapsed. The Reset switch on the Uno32 board will be used to reset the current time back to 0 when the stopwatch is stopped.