SIM900 (SIM900A) Mini DEV Board


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  • Power supply by 5V, can be powered by USB, for long term use it is better to still use 1A current power source. XH2.54-2P connector.
  • TTL 5V and 3V3 interface (yellow pins marked on board), compatible with arduino, STM32, raspberry pi, etc.
  • On board RS232 interface, easy for debugging. On the left, white pins.
  • On board ring signal LED, on the left-top corner of SIM900A IC.
  • On Board reset and restart pins, on the bottom of the SIM900A IC.
  • Reserved IPX mini connector, but not yet soldered.
  • Standard SMA antenna connector.
  • Serial port is protected by TVS and beads circuit, to prevent any surging current or HV.
  • SIM circuit has SMF05C electrostatics releasing IC.
  • Package includes antenna and DC jack.
  • Do NOT have audio power jack on board, which means you can not hearing or speaking through the call.
  • Board size is 5×5 CM

The attached images show how the use the USB-TTL programmer and RS232 to connect it.

Note: SIM900A is dual band module, may not work for some countries, please check your GSM frequency in your country before buy it.

Documentation please see on this page.

Additional information

Weight N/A
IC (General)


5 reviews for SIM900 (SIM900A) Mini DEV Board

  1. 5 out of 5

    conradj (verified owner)

    Absolutely a great module!!, a very good price and the 3.3V and 5V serial interface pins makes it easy to connect to all arduino without logic level conversion.

  2. Andy

    pls can i get how to connect the module to the arduino if possible can i get the code

  3. Chi

    Can I have the datasheet of this gsm module?
    Because I need to know more in detail about how to connect this module to PIC16f887a and how to configure in coding.

  4. 5 out of 5

    diazfjg (verified owner)

    Just perfect and easy to use.

  5. 5 out of 5

    vestale (verified owner)

    I took some time to find good examples to use this board. But is ok.

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