hossam abdo
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do u mean by calling the destination mobile and let it to answer automaticaly and pressing key 1 button on ur mobile..??
At command set is for sending messages or receiving messages and dialing a phone. For that you need a Sim card and network connection. But in your case you can make use of DTMF(dial tone multi frequency).
B clear whether you want to press keys and do the project go for DTMF
if you want to send message then go for GSM module with AT Command Set.
Decide it first then i will help you
You could take a look at HT9170 IC. It takes the audio signal as input and produces 5 digital outputs when a DTMF tone is detected. Fairly simple. I believe that this is what you are looking for.hossam abdo said:i want to press keys (DTMF)
Have you checked out the "ATS0" command?the another problem here is how can i setup the mobile for automatic reply.
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