i working on a problem to control devices with sms. i have interfaced sim900a and lcd 16x2 with PIC16f877A. i m able to send sms from sim900a to mobile . but i have problem in reading sms from sim900a and display it on LCD 16x2.i connected my C with SIM900a directly without any chip conversion check out my module .i have checked my programming code and and GSM module by hyperterminal both are working good but i dont know where is the problem .can anyone give me solution?
hello guys i m using pic16f877a with sim900a .and i successfully send sms .But i m facing problem in reading sms from sim900a can anybody give me solution that what can be the reason behind the problem
Hi as you said you are successful in sending SMS from GSM module can you please share the schematic hardware connection you did for sending SMS from microcontroller
Please share as soon as possible.
Thanks
Thanks for the replay, here am attaching schematic of wt am doing with hardware which is not working(not sending SMS).
please help me out. whats wrong in my connections.
am also attaching picture of GSM module am using.
kindly guide.
Try this code. If you get "IRP_bit must be set manually to access xyz variable" message in Compiler and also get garbage data on LCD or UART then use CopyConst2Ram() or change to PIC18F device.
Do you interface GSM to PIC UART directly using TTL pins ? If yes, does your GSM has 5V TTL pins ? Have you connected RxD, TxD, GND of GSM to TxD, RxD GND of PIC ?