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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.
Ganblejs
By the way, you can use the green light from HRM sensor as a flashlight in bjs2.
Just run HRM and shine it in a dark place, visibility will be much higher than from the screen as a flashlight âš¡