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Watch it cycle through the colors! 64 RGB LED pixels arranged in an 8x8 screen.
The top left LED is the pure hue, moving to white and grey on the right side, fading to black on the bottom row. The gradients of the top left LED fill in the middle.
How it works:
The different shades and tints of a given pure color are accomplished by careful adjustments of the red, green, and blue values. For example, light tints require some minimum current to always be flowing in red, green, or blue. Darker shades mean limiting the maximum current that can flow. I looked at an example gradient from a color selector on a paint computer program to find the patterns of max and min values to create all the combinations of a gradient matrix.
I put the patterns of values into the voltage sources and connected them to corresponding LEDs.
Right: Constant bias voltages
Top: Green max voltage controls
Bottom: Blue max voltage controls
Left: Red max voltage controls.
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