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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Robin
Sat 2017.04.15
Although my experience is with the Pico, my guess is that any GPIO pin will work. The software function you are after is digitalRead() http://www.espruino.com/Reference#l__global_digitalRead
Use this tutorial to garner insight. Wire Loop Game
One wire to ground. The other through a 10K to the GPIO pin. Or rely on the internal pull-up.