Double your microcontroller GPIO pins for LEDS - Charlieplexing Example Circuit

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Charlieplexing takes advantage of the HIGH-Z state of most microcontrollers to effectively double the number of GPIO outputs available for driving LEDs.

#shorts #circuitdesign #arduino #circuit #electronic #short #circuit #electronica
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To be clear, the three tri-state buffers are inside the microcontroller that is not part of the circuit. You only need 3 resistors extra to pull this off.

PeetHobby