Both sound very promising.
I could use the switch to activate/deactivate the magnetometer.
Do the IO ports have internal pull-up or pull-down resistors? How should the reed contact be connected to the Puck for lowest power consumption?
Am I right that I can use also my Espruino Pico to do the first tests to bridge the time until December? Are there any major differences between Pico and Puck I have to take into account? (besides no BT LE :-) )
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