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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
Good point about the device on the end! I hadn't considered that.
Yes, the STM32 will push out 20mA or so per pin, so should easily be able to handle 1k or less - but the RTC itself is probably built for low power consumption so won't have powerful output drivers.