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……