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GSM projet beginning problem.

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tapu

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Dear all,
I want to switch relay(5v dc) by using sim900a module.but i am new in gsm project.I have made 8051 projects in embeded c by using keil.Here how to program sim900a module? Or only I have to send command by mobile message and take a signal in module-port & control switch & vice versa??Please reply.
THanks,
tapu
 

how to program sim900a module?
Click to expand...

Your question can be quickly answered by reading datasheet; As being a modem, the sim900a module isnt't programmable, but interfaced with your code by using AT commands. Also, at datasheet we can't see any general purpose pin, therefore you should have another microcontroller based system at the remote side to get the commands that you will define to perform each specific task.
 

THank you for replying.
I want to interface 8051 with gsm module.I connect Rx,Tx of 8051 to Tx,Rx of gsm module & making same ground.But how to program/code 8051 to send message from module to my mobile?Please reply?

note:I have used keil5 to program 8051 in previous RTC project.
 

tapu said:
But how to program/code 8051 to send message from module to my mobile?Please reply?
Click to expand...

Again, read datasheet.
One option could be by issuing an SMS message with a command syntax defined by yourself.
 

tapu said:
THank you for replying.
I want to interface 8051 with gsm module.I connect Rx,Tx of 8051 to Tx,Rx of gsm module & making same ground.But how to program/code 8051 to send message from module to my mobile?Please reply?

note:I have used keil5 to program 8051 in previous RTC project.
Click to expand...

The interface is correct, Sending SMS using GSM module through microcontroller can be done through your program only in your case. Generally for sending SMS using GSM module need to use the command --> AT+CMGS ="Mobile number".

Attaching the snapshot of the command details.

Capture.JPG​

Now you need to program your controller in such a way that it can send the above message command to the module.
 

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