Abstract
Human life is the most valuable thing on earth. There are many ways the life of human can be put to risk. The most pathetic one is fatal accident. Accidents are caused because of rash driving and negligence of traffic rules. This paper will provide a solution to avoid accidents caused when drivers go beyond the stop line without noticing the change of signal. In the proposed system the circuit uses a Magnetometer sensor which detects the distance between the vehicle and the stop line. Even after the signal turns red if the person approaches the stop line with the same speed, the circuit turns on the switch which in turn raises an alarm. The intensity of the sound produced by the alarm is initially below 20dB less than the audible range, as the distance goes on decreasing the dB of sound increases and if the vehicle stops this switch is opened. This will thus cause a loud sound if the vehicle crosses the white line even after the signal is turned red. This may not provide a complete solution but at least save the other person from moving beyond by knowing that vehicles are still moving on the other side.

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I want more details about the circuit of magnetometer sensors and how it get power to switch on the alarm......