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@vimalkhanna try using transistor(2n2222) as switching to convert your signals to 5v then use MAX232 for serial communication. It works i have tried it for 3v but you can make it for 1v also.
I am having some problem with my SIM900D, at first its got connected to the network but now it does not connects to the network. I check the AT+CREG command and the result is +CREG:1,3 3 means registration denied. I have this same problem with my old module then I changed the SIM900D SMD it...
I am having some problem with my SIM900D, at first its got connected to the network but now it does not connects to the network. I check the AT+CREG command and the result is +CREG:1,3 3 means registration denied. I have this same problem with my old module then I changed the SIM900D SMD it...
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