I'm trying to connect a GSM module(sim800L) with a NodeMCU to execute remote operations. But the GSM module cannot be powered using the NodeMCU. So, what are the other ways to power the board as well as the module. Also I want to connect directly to a wall power supply instead of using a battery.

  • connect them to the supply in parallel.
    – dandavis
    Commented Jun 1, 2023 at 6:49
  • So, I would have to use a 5V 2A power adapter and then connect the devices in parallel to it. Right? Commented Jun 1, 2023 at 13:05
  • Check if your SIM800L can actually take 5V. If so, then you can connect both in parallel.
    – Fahad
    Commented Jun 12, 2023 at 5:16
  • the sim800l module operates between 3.7 to 4.7 V Commented Jun 19, 2023 at 16:41

1 Answer 1


After a bit of researching, I have found the following solution:-

A DC-DC buck converter (such as the LM2596) can convert a 12 V 2A rated power supply down to 4 V (the value is adjustable) which can then be used to power the module.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.