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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.
@DrAzzy
Yup - to be clear, they don't need to be the same letter. They just need to have different numbers.
If you need more than 16 buttons (or, more likely, before then) you can use a matrix keypad (search for membrane keypad on ebay - dirt cheap 1x4, 3x4, 4x4, 5x4 are readily available) with the KeyPad module.