Overheating issue of the SIM800L module

Projects Networking, Protocols, and Devices
1

I am using SIM800L for a SOS project where in the state of emergency the Arduino UNO sends a SMS via GSM module. The message consists the location and time of the emergency.

But, I am facing a problem with my SIM800L cause its overheating to a point where it melted and fused the SIM card. The first time I used it I had used 9v batteries to power the GSM module but I knew that the power supply wasn't stable enough to connect to SMS server. Now i am using a DC power supply adapter with Buck down converter. i have tried supplying 3.3v, 4v, 5v and 9v but it overheats in all the voltages. After which I even tried to supply power from Arduino board itself its still burning up. I thought its the defective module and bought a new one but the issue remains the same.

Please help me resolve this issue.

2

The datasheet says "The power supply range of SIM800L is from 3.4V to 4.4V. Recommended voltage is 4.0V."

Are you following a tutorial that says you can use 9v?

3

Yes. I tried giving it 4v also but the results are same.
Please do provide with reference link if you have one.

4

Learn from your mistakes: recycle the trashed GSM module responsibly, and power the next one correctly.

5

To quote the datasheet again "power supply must be able to provide sufficient current up to 2A", so make sure your power supply can deliver that without going into current limit mode.

6

in case of power loss currently using Rechargeable Battery, 3.7 V, Lithium Polymer, 1.35 Ah
requires some mechanism for recharging, e.g. mains, solar, etc
important to check battery voltage before switching on modem and attempting to transmit

7

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