Movement sensor

[Archangel]

Mister_e,


Let's say if you push the car it should be already enough to switch
on.
My project is a gps data recorder and the switch will avoid the pic
to stay on.

Bye
Lotondo

Hi Lotondo,
The alarm industry already sells motion / Vibration sensors which are very sensitive, my noisey car sets them off all over town They work by suspending a little magnet over a coil or hall effect sensor on a silicon rubber band. you could use one to "wake up" your pic which could then check the vss or antilock brake sensor and go back to sleep. I really do not see why you would need to go so low power mode given the massive power reserve a car battery contains, I am pretty sure you could power a pic for many months without killing the battery. Your car's computer has a constant draw and yet the battery lives a very long time.

[Pic_User]

Omni-directional Tilt and Vibration Sensor
SQ-SEN-200
draws as little as 0.25uA of continuous current
This site even has PIC BASIC Pro Code:
http://itp.nyu.edu/physcomp/sensors/Reports/SQ-SEN-200

Manufacturer:
http://www.signalquest.com/sq-sen-200.htm