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Security Bike/Car

This is to understand working of GSM, which is used in many communication devices. GSM module understand AT commands. This all works of AT command is done by using library <"GPRS_Shield_Arduino.h">. In this project when the missed call will be received from the owner mobile number , then only, bike/car ignition should get on, else it should give alarm for showing somebody else is trying to switch on the bike/car.

So in the input we have to give an authorised telephone number of the owner of the bike/car. Here I have given 13 digits as 10 for number and 3 for country code.

At output after receiving the missed call for that particular sim card, we write in the program to do that Pin status HIGH, which is connected to corresponding relay module whose pole and no (not connected) works as a switch for the power supply of Bike/Car.

GSM card has only three connection. One is ground, second is Rx and third is Tx-Rx is connected to Tx of Arduino, and Tx of GSM card is connected to Rx of Arduino.

For this we have to give the owner number in the program, and no of digits of the telephone no we have given 13 and 10 digits for the telephone number, 3 digits country code.

,p>When signal /missed call received by the receiver of GSM Card , And the number matches with the given number in the program, we do HIGH to the Pin of Arduino , which is connected to that relay module, whose pole and NO connection we have to use, as a switch for the power supply of the bike/ car.

GSM module is used in many communication devices which are based on GSM (Global System for Mobile Communications) technology. It is used to interact with GSM network using a computer. GSM module only understands AT commands, and can respond accordingly. The most basic command is “AT”, if GSM respond OK then it is working good otherwise it respond with “ERROR”. There are various AT commands like ATA for answer a call, ATD to dial a call, AT+CMGR to read the message, AT+CMGS to send the sms etc. AT commands should be followed by Carriage return i.e. \r (0D in hex), like “AT+CMGS\r”. We can use GSM module using these commands: