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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.
@Michael
Sorry I forgot to mention originally that I had tried using B1 (wired it to SDA - B1 is 4th from the right on the top row of pins in the photo). It may be worth to update the doc (to specify B1 for pico & B2 for original for SDA)? I also tried tying SDA to hi or lo, and in all cases I'm getting spurious emissions of the error I mentioned. I will try another card, and report back. Thanks for your help.