How to provide enough power for SIM800L/SIM800L V2 GSM module?

Other Hardware General Electronics
1

Hello! This is my first post here, on this forum, so I hope I choosed proper forum section.

I'm doing some project based on Arduino Uno, some sensors, LEDs, buzzer etc. I want to add GSM module and see that SIM800L / SIM800L V2 should be enough to send SMS.

I read that these modules should be powered via external power source, and peak current can reach even 2A.

I have some AC adapter - 5V, 2A. If I choose SIM800L V2 and add this connector: Accelevision PS204PF1 5.5mm x 2.1mm Female DC power jack with screw terminals

then it will be working properly?

But when I choose SIM800L, then I need something like this: LM2596 DC-DC converter to adjust lower voltage from 5V to ~4.1 V right? But what about current? Will it lower together with voltage?

Thanks in advance for any suggestions.

Greetings

2

Does your specific module take 5V as input? (not all do!) If yes, it'll work fine. Do consider adding a large capacitor near the SIM800L (right at the board) to help stabilise the voltage.

If no, you may indeed add a buck converter - make sure it can supply sufficient current.

1 Like
3

I ordered SIM800L V2 which takes 5V input :slight_smile:

But I would like to power up all the things from one power source. I thought about buying AC adapter 5V/3A-4A, using DC connector and power all from the contact board, but when SIM800L V2 takes 5V as input, Arduino takes 7-12V when using external power source.

I thought about using short USB-A <> USB-B cable, cutting off USB-A connector. Then I could plug 5V and GND from this cable to the contact board and power supply UNO this way. What do you think about it?