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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.
@user97106
I am using 2V01.
To be honest, I'm suspecting the NFC card reader.
I think I will pursue your suggestion. I don't have an oscilloscope at the moment, but I think this is a good time to buy one :-)
Thanks