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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
On the Espruino board (and the Pico) there's the RTC, but also another software timer based on SysTick that 'follows' the RTC and allows the board to make very accurate time measurements.
On other boards (like the Nucleo) that doesn't happen. Instead SysTick is used directly, which means that you're totally dependent on the speed that the processor is running at.