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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.
@allObjects
Feels like a jitter to me, caused may be by auto-flipping pin modes...
Try to set pin mode before using the pins...
ESP826, ESP32 and the various STMs are all different hardware. The GPIO HW and how the are 'operated' have impact on Espruino behavior.