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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.
@DrAzzy
They operate at 3.3v - however they are 5v tolerant, so if you set the pinmode of the relevant pins to 'af_opendrain' and rely on the shield's pullups, you should be good to go.