charlieplexing

Controlling LEDs with Charlieplexing

Controlling LEDs with Charlieplexing

MAKE contributor Andy has created a great tutorial to introduce you to the utility of “Charlieplexing,” a method for controlling multiple LEDs without the use of multiple microcontroller pins. With charlieplexing you can turn on or off one LED at a time. To light more than one LED at a time, you can scan the LEDs by turning a sequence of them on and off really fast.

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Charlieplexing times two: GuGaplex your LEDs

Dhananjay Gadre wrote in from New Delhi with news of “GuGaplexing”, an update to the tried and true technique of Charlieplexing. GuGaplexing introduces a set of transistors into the mix to double the number of LEDs you can address: The transistor pairs are so arranged that they provide an out of Vcc/2 at the output […]

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