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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.
@ancienthero
I haven't thought about it that way, good point
as I found, these tiny rtc modules are designed to work with Raspberry Pi (https://goo.gl/hwqD8I) moreover they all have soldered 4.3k pull-ups, I dont think they all manufactured broken with wrong pull up value.
I suspect 4,7k is okay for stm32 but anything below (like 4,3k) is not