Tilt/Vibration Sensor

[wdmagic]

I have done some vibratin sensors using a old headphone speaker with a small ball point pen spring superglued to the cone , I have tried perpendicular and parallel, #2 works better, but I had to use a LM386 to amplify it and used a germanium diode to rectify it. it might be possible to use a opto isolator in place of a amplifier, just depends how much voltage you can get out of a vibrating speaker, usually not much.

[pedja089]

Most of car alarms use coil and magnet on spring, signal from coil is goes to comparator, output to monostable.
This way you can set trigger level, and you can define duration of output signal.
In stand of coil, magnet and spring you can use piezo.

[Ioannis]

No in my case. PIC must be in sleep mode until a clear TTL level trigger wakes it up.

So, anything like a switch can be used. Not analog senors.

Thanks for the input.

I am waiting for the new spring sensors and also trying ways with the ball sensor.



Ioannis