RGB led matrix control

After learning a lot from my initial LED matrix driver I wanted to go to the next level, RGB! The problem is to PWM so many leds. Texas instruments has a wide range of chips that make it possible to PWM a large amount of leds with current control via a serial interface.

The TLC5940 is a popular chip that is demonstrated here. Only one line for now is connected and only 16 leds at that. I am still working on the row multiplexing. This needs to be very fast with minimal ghosting, the previous led matrix system had problems with that. Instead of using low Vce transistors for switching MOSFET's are going to be used.

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Last update at: 26-09-2010