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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
Have you got the up to date firmware on your Pico? And which bit of that tutorial doesn't work properly?
Getting the CPU activity from your PC/Mac is probably the hardest part since it's being done with command-line tools... What's your operating system? It might be the commands need to be slightly different