C C++ Arduino Prolog
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Problem: Arcade machine buttons have provision for a lamp to illuminate the button. Originally this was a filament bulb, nowadays usually an LED. We want to replace these with full-color RGB modules. However the housing only provides two terminals. Solution: An RGB LED module that requires ony two external connections, one of which is ground. firmware/ Code that runs on the LED module pcb/ PCB design libowled/ Arduino library for controlling LEDs The v1 PCB does not work as-is. The pull-down resistor shoould not be populated, and a 1nF bypass capacitor added in parallel with the schotty diode.