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iam using ‘AT 89s52’ microcontroller…….. generally the input of pin P1^1 is 0………. whenevere its input turns into “1”……… a call should be established to a mobile number and a sms(“danger”) also send through gsm modem………and also tell me the hard ware connections interfasing of gsm modem to microcontroller…… plz help me……….. i need source code for this …..thank u sir……
Hi Ravi,
You should have a good idea about hardware interrupts and also gsm interfacing. I hope the following links will help you a lot
http://www.engineersgarage.com/tutorials/interrupts-8051-interrupt-programming
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