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B4R Question Help with schematics (Arduino-SIM900)

Discussion in 'B4R Questions' started by Beja, May 12, 2019.

  1. Beja

    Beja Expert Licensed User

  2. Cableguy

    Cableguy Expert Licensed User

    I have successfully used a different GSM shield with ESP8266 and I remember it was tricky.
    First lesson learned, don't power the GSM module from the Uno, it draws too much current and you may fry the Uno.
    The Comms are simple TX-Rx but there the CS pin that need to be pulled up during initialization.

    It's all I remember, and I no longer have code to share...
  3. Erel

    Erel Administrator Staff Member Licensed User

    Beja likes this.
  4. Beja

    Beja Expert Licensed User

    Thanks Erel
    A little more than that.. The button, LED and resistors connection not so clear to me.
    We need a volunteer to draw the sch
  5. embedded

    embedded Member Licensed User

    Both Ground are comman...means connected with each other

    Transmitter of GSM....Receiver of Arduino
    Receiver of GSM.....Transmitter of Arduino

    Both having separate power supply....in this scenario
    Beja likes this.
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