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FastLED is a fast, efficient, easy-to-use Arduino(ish) library for programming LED strips and pixels like WS2801, WS2811, LPD8806 and more!
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128x64 OLED displays are available for under $5 USD and are easily interfaced to Arduino AVR and STM32 boards such as the Maple Mini clone.
How about NTSC color video on a single chip with just 2 resistors?
Some Canon DSLRs don't have a built-in intervalometer. Simple solution - make one yourself!
Work in progress
Magic wand to paint with color light based on temperature.
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Offload IR decode to a dedicated Attiny85 for efficiency, simplicity, and reduced resources on the main microcontroller.