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When a car collides with a hard object like another car, wall etc. There will be a rapid deceleration. This rapid change in acceleration can be detected by MEMS based sensor Accelerometer like ADXL203. It is available from Analog Devices. Search Results | Analog Devices . But it requires a complex circuit and sophisticated air bag arrangement with a very fast response time so that air bag opens in real time just after accident. It is not possible to make such a working arrangement at home. It requires sophisticated facilities, equipments, gas and material.
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