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  • I'd definitely recommend that you go with the Espruino MDBT42Q module that @allObjects mentioned - it's low power, has a reasonably accurate clock, and even if you don't use the Bluetooth it's a nice easy way of setting the time correctly.

    The Pico is a little smaller but while it is faster it's not quite as power efficient, and it's also the only official Espruino board that lacks an accurate clock - which could make life tricky for you.

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