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    erazor

    @erazor

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    Posts made by erazor

    • RE: ATOM-DTU-NB-IoT - modem does not respond anymore

      @forairaaaaa you can find my code here:
      https://github.com/erazor83/nb_dtu_reset_issue/

      posted in Atom
      E
      erazor
    • RE: ATOM-DTU-NB-IoT - modem does not respond anymore

      Update for anybody who's reading this.

      My previous assumption that the reset-button kills the modem seems incorrect.

      I've had another two devices and carefully did not use the reset-button at all but these modules also stopped working.

      posted in Atom
      E
      erazor
    • RE: ATOM-DTU-NB-IoT - modem does not respond anymore

      @felmue thanks for your hints and your time!

      posted in Atom
      E
      erazor
    • RE: ATOM-DTU-NB-IoT - modem does not respond anymore

      @felmue there is nothing. I also removed and replaced Q3 with Q5. My idea was, that maybe Atom-RX line became output and killed Q3 but that's not the case.

      Removing the Q5 completely changed nothing.

      I ordered another two modules to check the signals but I start to think the issue is in the modem.

      Maybe I come to a point where I should ask the M5 team for help. This is kinda annoying, I really like the design of the DTU.

      posted in Atom
      E
      erazor
    • RE: ATOM-DTU-NB-IoT - modem does not respond anymore

      Well, yes.... "AT\r" should be enough and this was even mentioned in the datasheets.

      Anyway, mostly people use tinyGSM and "AT\r\n" should work anyway.

      I tried "AT\r" - no difference, the modem remains silent. I also tried a USB-USART connection with 3.3V levels and tried different baudrates, spamming the modem with any combination of "AT\r\n" - no success.

      Normally it has autobaud, if not it should start with "RDY" - I'm not getting anything with powerup. The modems LEDs blink but thats all.

      I saw that they're translating the logic-levels from 3.3V to 1.8V. I'm not sure but these are looking completely strange to me.

      0_1676556849878_IMAG001.BMP

      There shouldn't be any 3.3V peaks, right? The image shows my TX line, somewhere at transistor Q3. NB_RX and U1_RX are looking quite similar, so maybe the transistor is broken?

      posted in Atom
      E
      erazor
    • ATOM-DTU-NB-IoT - modem does not respond anymore

      Hi, I was playing with the DTU-NB some days ago until suddenly the modem stopped responding to any AT command.

      So I bought two new devices, and now none respond anymore.

      For testing I started to use "TinyGsmAutoBaud" (I also modified the code to use the correct PINs). With my first broken DTU - no response to any Baudrate.

      Since I seemed to broke the second module already and the TinyGsmAutoBaud also does not respond I simply put the Atom into my third unused DTU - which worked and got a response with 115200 - so the TinyGsmAutoBaud and Firmware seems to work.

      I tried the same Atom on my second (broken) DTU with no success. So I resumed playing with the third DTU, and pressed the rest button - and finally this one also does not respond.

      Is this a hardware issue? Any way to get the broken devices running again?

      Thanks for your time.

      posted in Atom
      E
      erazor