LED Thermal (Mis)Management

Ed explores heat transfer and shows how a simple linear equation can predict an LED’s operating temperature. He presents the thermal effects that arose in some of his most recent LED projects. After you’ve provided an LED with the proper voltage and current, as I described in my March 2016 Circuit Cellar 308 column, you must also […] The post LED Thermal …

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Lights and Music

Serially Addressable LEDs as Ukulele Learning Tools ukule-LED is a ukulele with LEDs embedded in its fret board. These LEDs can light up in configurations corresponding to different chords, which can aid the ukulele player in learning how to play chords and entire songs. The system’s microcontroller interfaces with the LEDs and a Python-based command […] The post Lights and …

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The Analog Side of PWM LEDs

Ed shows the surprising current waveforms drawn by what seems to be a trivially simple LED Mood Light. He explains how Neopixels work and presents the large current pulses produced by their PWM controllers. Sophi’s most recent Burning Man installation featured a pair of Mythical Talking Unicorns outlined in rainbow hues produced by several hundred […] The post The Analog …

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