In my car (a 98 Nissan Sentra GXE), there doesn't seem to be any detection
(electronic or mechanical) of the window being fully up or down. If you
push the switch with the engine at idle, the engine revs up ever so
slightly (I assume to provide the needed power without draining the
battery) and this happens even when you push the switch with the window
fully up.

Sean


At 05:26 PM 7/15/99 -0400, you wrote:
>Measuring current or voltage drop over the motors can works, but it
>changes so much from different brands, contacts resistances and so one,
>even some extra drags on the windows can sometimes reach the same
>current of the end-of-curse.
>
>Actually when the motor reaches the end-of-curse position, it (most of
>the times) enter in a steady condition of non movement, with a (almost)
>constant current or voltage drop, so monitoring this situation could be
>a solution.
>
>If you could install something close to the motor, a field effect sensor
>would be (probably) a solution, since the magnetic field around the
>motor is changing when the motor is rotating, and somehow steady when it
>is overload and blocked.
>
>If you really can install things, do what all the manufacturers should
>do long ago, install limit switches...!
>
>--------------------------------------------------------
>Wagner Lipnharski - UST Research Inc. - Orlando, Florida
>Forum and microcontroller web site:  http://www.ustr.net
>Microcontrollers Survey:  http://www.ustr.net/tellme.htm
>
|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
Save lives, please look at http://www.all.org
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