Sebastian Tomczak has been playing around with controlling VGA output from an Arduino. Using Max/MSP to process audio and send data to the Arduino and a standard VGA output to send sync data to the monitor, he’s been able to put together some cool video effects.
You can grab the Max patch and Arduino code from Sebastian’s post. I dig the effect – it reminds me of the cool C64 demos kids used to make.
Arduino @ The Maker Shed store.