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  • after 2days battle with the DS3231 RTC I want to share my thoughts

    If you get this kind of error

    Uncaught InternalError: Timeout on I2C Write BUSY

    It's most likely because I2C pull-up resistor value is too low, it should be 10k not 4,7k
    4,7k is a default pull-up value in many schematics but it's not enough for stm32, of course in many cases 4,7k would do the job but if you want to avoid hazards always pull-up 10k on I2c.

    In my case, a cheap DS3231 module had soldered 4,7k resistors, funny enough it was working on a breadboard but not on my custom made PCB lol....


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