Atmel based using pwm for the rgb outputs. I used a pot which was read by the avr chip to process the pwm for output values, giving me control of the actual colors emitted. I added a dimmer circuit for night-time. The housing is clear plexiglass that i sanded a bit to diffuse the light. The camera doesn't really pick up all the colors but you get the idea. All code was written and compiled with arduino ide.
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