This Instructable teaches how a basic embedded controller can be programmed to control LEDs (of the primary colors) such that Red, Green, and Blue light can be mixed to create a full spectrum of colors. Optical effects created due to pulsation patterns of light can be explored as well.
The Color Mixer uses a ‘Stamp’ Microcontroller Module from Parallax to control 4 bright LEDs.
The LEDs are Red, Blue, and Green and by controlling which LED is active at a given moment it possible to create a mix of colors from Red to Purple and even White.
Interesting Pulsating and Strobe Effects can be created by selecting a given color and adjusting the pulse rate.
The Color Mixer Circuit can be used as described in these instructions or can be modified to be part your unique application. Code for the controller is included and can be modified to extend the visual effects possible.
The next step has a video of the color mixer is operation.
Step 1: Color Light Mixer Operation Video
Example of a "Blue" color being generated by the mixer: (ref static image)
Example Operation of the Color Mixer: (ref Video)
The Color Mixer can adjust colors from Deep Red to Bright Purple (and near White) and the light can be made to pulse at varying rates.
Some pulse rates and color combinations create an optical illusion that look like the following: a laser, a plasma stream, and a jet engine exhaust.