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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.
@taro33
Thanks both. I apologise for referring to Espruino in my post when I meant Puck.js - this is the device that we're interested in. Does the Puck.js product have any hole in it to attach it to a lanyard?
ClearMemory - I like your solution but given the two-way communication between A and B it would require pairing, right? If so it's not really an option for us as we need a solution which can work across many different devices in quick succession. If you have further ideas please do let me know though.