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Murlidhar Roy
Student
 · BhubaneswarIndia
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I am working on a project DTMF based home automation using arduino and gsm 900a and i need some help. Please send me the circuit diagram and code.

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Nilotpal Sarma
Engineer
 · GuwahatiIndia
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You can simply connect the DTMF module to the digital pins of arduino, for connecting the gsm module make a new serial port on arduino and connect rx(ard)-tx(gsm) and tx(ard)-rx(gsm)

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