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LedBorg - An ultra bright RGB LED add on board for your Raspberry Pi | PiBorg
https://www.piborg.org/ledborg/specs, posted 2015 by peter in hardware raspberrypi visualization
The LedBorg provides a tri-colour LED controllable from the Raspberry Pis GPIO header. Using simple on / off logic it can provide a total of seven colours as well as off. Using software based pulse width modulation (PWM) it is capable of many more colours, around a million in fact.