Is there any better GSM module over SIM800L modules? I encountered so many issues with it & planned not to use it again.Anyone has someother modules which can use in the industry...!!I only need CALL& SMS functions.
1)Unfamiliar UART level convertion, How did you connect it to the PIC? whats the supply voltage of the PIC?
2)What type of antenna did you used?
I powered the PIC with 3V3 & connected directly the UART.I put a 1K on PIC TX side.Problems down to half way mark.I am powering the module using LM2596 buck modules @4.2V
But still the modules not stable in factory environment.
Just resistiors for level conversion, aerials are to a socket, so plug in what you want - for testing I use the little crappy PCB aerials than often come witth them.
With all such modules supply is critical, I use 1F super capacitors on their supply.
Just resistiors for level conversion, aerials are to a socket, so plug in what you want - for testing I use the little crappy PCB aerials than often come witth them.
With all such modules supply is critical, I use 1F super capacitors on their supply.
The module is turned off almost all the time, usually only turned ON once a week - I hold it in reset as power is applied, and then release the reset pin once the supply has settled.