SIM800 Module stops registering after a few days

[Nigel Goodwin]

HELLO I am using sim800l...
The imei printed on my board is different than as I get the imei number from AT+CGSN command.. What does it mean... My module is fake or something....?

That's perfectly normal, all mine do the same - and I actually use the IMEI to identify the units they are built-in.

But there's no need for the printed number on the board, mine connect to a PHP/MYSQL database, and automatically create a new entry if the IMEI number isn't already in the database thus self registering.

As for not registering, are you trying to leave it permanently connected?, because after a while the provider will disconnect you.

One of mine has recently flattened it's battery, it was on long term test running from a single (second hand) 18650, uploading data every 8 hours (normal usage for the intended application would be weekly) - it managed 378 uploads, before the battery was too low for it to continue.

 

[kishanbhamre]

That's perfectly normal, all mine do the same - and I actually use the IMEI to identify the units they are built-in.

But there's no need for the printed number on the board, mine connect to a PHP/MYSQL database, and automatically create a new entry if the IMEI number isn't already in the database thus self registering.

As for not registering, are you trying to leave it permanently connected?, because after a while the provider will disconnect you.

One of mine has recently flattened it's battery, it was on long term test running from a single (second hand) 18650, uploading data every 8 hours (normal usage for the intended application would be weekly) - it managed 378 uploads, before the battery was too low for it to continue.

Thanks for quick reply...

I put the module permanently Connected for 1 hour ... And +CREG: 0,3 and network led blinking at 1 sec Continuously... Here I attached photos of my set up.. I gave 5v supply to sim800l board and was working perfectly few days ago... I am using 18650 battery and 5v booster as supply...

 

[Nigel Goodwin]

Don't use the 5V booster, you're probably killing the SIM800 by using that, the 18650 direct to the SIM800 is all you need. Check the SIM800L datasheet for it's voltage specifications - it's designed for a maximum of 4.4V, and specifically for a direct feed from a Li-Ion battery.

And make sure your FDTI module is set to 3.3V, it looks as if it is though.

 

[danial1860]

Hi everyone,
Has the problem been solved?

 

[SobhanJahanipsrast]

First, make sure about the power supply and stability by adding a large capacitor. Then take care of the antenna. If your problem didn't solve. Replace your GSM module.