hello every body
in my project i have used SIM800C and Atmega32A.
i used this circuit for supply(Recommended in SIM800C Hardware design):
and this is the sim800c circuit(Extracted from sim800c hardware design):
and this is microController circuit:
and entire PCB:
in above PCB, P2 and P3 are headers to connect board to my AVR programmer through ISP.
when programmer is connected to my board the circuit works good
But when I disconnect the programmer and want to use the board stand alone, MicroController resete for multiple times when:
1.when SIMCARD is going to be registered in network.
2.when I want to call the simcard
1.doesn't matter what program is burned into Uc, it resets.
here is a video from the problem: