Atom Lite connect to sim800, RX/TX Pinout HELP

  • HI all,
    I am looking to connect SIM800 model to ATOM Lite, but have a problem to understand witch pinouts are RX and TX

    can anyone help with the Atom Lite PINOUT?

    also is there a similar project, I want to send some data to server


  • Hello @alien

    on the M5Atom there are no predefined pins assigned to RX2 and TX2. GPIO21 and GPIO25 are assigned to I2C so I would not use those. I have successfully tried GPIO19 for RX2 and GPIO22 for TX2.

    Good luck!