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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.
@stewartg
Great, thanks! This is very helpful. :-)
I wasn't sure if I would have to implement my own PWM, but this looks easy.
I'm fairly confident that a piezo stuck to the back will be better. This is how talking watches are constructed, and they can be very loud. It might not be optimal because of the need to use a smaller piezo, positioned away from the center of the plate. Looking forward to trying it out when my devices arrive.