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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.
@Gordon
With the Web IDE, did you click the 'connect' button in the top left? If you're not connected then the terminal won't react.
Also, you say you used
/dev/tty...- what about/dev/cu...? Sometimes I think you may need to use that on Macs.It's possible that the Mac is actually trying to take control of the Pico and use it as a modem (you could check in settings and see if that's happening?). It would explain the issues you were having with
screentoo.For the external button, after using
pinMode(B4, "input_pulldown");, doesdigitalRead(B4)return 0 when not pressed and 1 when pressed?