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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
No, you don't need the SD card for that.
The code you pasted isn't exactly what you sent over, because somewhere there's a
save()command and areset()command?What happens if you put exactly what you wrote into the right-hand side of the Web IDE and click 'Send to Espruino'? I've just tried it and it works with a MAX7219 here.