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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.
@Gordon
The Pico/Original/WiFi boards have that restriction on the full number after the letter - so you should be able to theoretically have 16 watches (0..15) - although not all boards have all numbers exposed (eg. no pin 11 or 12 on the Pico).
Pin A2 and B12 shouldn't interfere, so I'm not sure what's going on there...