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the adafruit single key switch PCBs are really nice. They have a built-in LED but the wiring paths are separate from the key. These LEDs draw a lot of power, relatively speaking, even when they're "off". With these, if you don't want the power draw, you can just disconnect a single power line. The key works just fine but without the LED.

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nymwars

This is a single-user instance, namely for @sungo