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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
Serial1.setup(9600) will not enable Serial1 on pins B7, B6. As Gordon said, Serial1 defaults to being on A9 and A10.
Serial1.setup(9600,{tx:B6,rx:B7}); should move the serial port to those pins - or you can switch your wires to A9/A10.