RGB LED PWM DRIVER

Description

The original RGB PWM driver application that I wrote in 2004 had a few shortcomings. Probably the biggest was that it was not easy to add to or change the sequences.  This new version addresses that problem, is more flexible and now includes the ability to put the PIC to 'sleep' and 'wake' it again using the sequence select switch, eliminating the need for an on/off switch in battery powered applications.
The circuit uses (RGB) Red, Green and Blue high brightness LEDs that are pulse width modulated (PWM) to vary the intensity of each colour LED.  This allows effectively any colour to be generated with rapid changing strobe effects, fast and slow colour fades as well as static colours.   The data used to set and change the colours is held in an easy to edit file so if you don't like the sequences provided with it, you can modify the sequence data include file yourself and reprogram with your own sequences.

        Schematic   

Since I do not know exactly which LEDs you will use I've specified the LED current limiting resistors on the conservative side.  You may want to change the value of these resistors to suit the actual LEDs used.  Keep the current per channel to under 40mA maximum.



Download schematic in pdf
Download source code
Download hex for 16F629 and 16F675
Download hex for 6F683