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August 29, 2014 AT 5:04 pm

The Issue | LED Tricks: Gamma Correction

Components Dutycycle
The Issue | LED Tricks: Gamma Correction @ The Adafruit Learning System.

You’re trying to program some cool LED effect but keep getting these weird not-quite-right colors. Maybe you’re trying to mix orange (say 100% red, 50% green) but the LEDs show yellowinstead. What gives?

An LED driver IC — the “smarts” inside NeoPixels and other addressible LEDs — use pulse-width modulation, switching the LED on and off very quickly (about 400 times per second in the case of NeoPixels), much faster than our eyes can perceive; we just see a uniform brightness. The “on” vs. “off” time determines the intensity.

Learn more!


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