I have developed a prototype of an asset tracking system using a GPS receiver and sim800l module to send the location through SMS. Arduino UNO was used in this project and an external battery was used to supply 4V 2A current to sim800l. The system worked very well for the initial 2-3 months then it wasn’t used for like 40 months or so.
Now with the aim to upgrade the prototype, I powered this using the same battery (recharged to 4V) and same circuit configurations (shown below) but sim800l is resetting just before sending the messages. I’ve tested the sim800l module using AT command and it is working fine but just before an SMS is to be sent, it resets, and LED blinks once per second.
I’ve tried some of the solutions provided on this platform such as using 1000uF or 4700uF capacitor in parallel with the power supply but it didn’t work for me.
kindly help me out…