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car crash notification system

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ERCCS

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im building a car crash notification system,, can anyone tell me how can i interface a trigger (crash sensor) to a 16f877a ?
 

I'm assuming this trigger is to set off an air bag or something, I just have this image of crashing my car and a little light lighting up on the dash board telling me that I have crashed ... What kind of sensor are you thinking of using?
 

im connecting a a linkmatik 2.0 to the microcontroller (16f877a) which will trigger my android application (in car phone) to send gps coordinates via sms,, my question is how can i trigger the microcontroller to do this?? and i also need to know how can i program my pic

---------- Post added at 23:58 ---------- Previous post was at 23:45 ----------

i dont want to use a real crash sensor,, i just want to trigger the pic,, the crash sensor will be designed later on
 

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