Huge current drain



  • Hi there,
    Just finished upgrading my wipyv2.
    now I am experiencing a weird issue:

    I am suplying 3V3 with an LM317T circuit.
    Thing is it was getting terribly hot 80ºC+ and the wipy led was not blinking.
    Nothing else but P1 P2 UART port connected.
    I measured current and reaches up to 400mA maybe due to power supply limitation. Otherwise could go higher.

    Upon starting I can continuosly read this on UART

    rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
    flash read err, 1000
    Falling back to built-in command interpreter.
    OK
    .>ets Jun 8 2016 00:22:57

    rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
    flash read err, 1000
    Falling back to built-in command interpreter.
    OK
    .>ets Jun 8 2016 00:22:57

    I then thought maybe the recent upgrade went wrong so pulled down P3 and got

    rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
    waiting for download
    ets Jun 8 2016 00:22:57

    But upgrade keeps failing.

    Any ideas?



  • @deadpixel If it is not working any more, it's probably the regulator chip which is dead. That's the smaller one of the two chips next to the RGB LED. If you unsolder it, you can supply the WiPy through the 3V3 Pin (now!).



  • @robert-hh Thanks again... I wish this Warning was on the Getting Started Section rather than notes...
    Will see if my wipy is still alive... :(



  • @deadpixel NEVER use the 3.3V pin for supplying the device. This Pin is an output, not an input. See: https://docs.pycom.io/chapter/datasheets/notes/ You can safely supply the device through the 5V pin with 3.3V, even if the note says 3.4 V.



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