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I got some little zombie heads from a forum member. They change from red to green to blue to white. Is this done by varying the voltage or is it voodoo.
 

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I got some little zombie heads from a forum member. They change from red to green to blue to white. Is this done by varying the voltage or is it voodoo.
Single 2-lead color changing LED'S have a tiny microcontroller built in. The chip controls the color pattern.
 

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Thanks J Man. But if the color is controlled by a chip the chip must be changing something like the voltage.
Well sort of. The LED is actually RGB and contains 3 LED'S in one package, (red, green, blue). The chip uses PWM to control the intensity of each color to produce, (what appears to the human eye), a wide array of colors.
 
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