Hi all!

In this (car alarm expansion module...)project, when a trigger occurs the
system switchs on the electric glasses motors, and then I need to sense when
the glasses are full up, to turn off the motors.

To sense this window closing without using any external sensors and wires, I
though in sensing the dc motor current; when the glass get full high the
current will increase and the uC can detect it and turn off the motor.
Maybe sensing the voltage drop on a low value series (power...) resistor, or
sensing the change of current (and magnetic flux) when the motor stops, with
an external coil (provided with ferromagnetic core...) A PIC with ADC can
then do the remaining job.

I know, there are security issues involved in this kind of approach (Hand
pushing the glass when closing...)

Any better approach? Any hints?

I'm trying to avoid the use of, for example, piezo sensors, because of the
problem of the wires and external mounting.

TIA,

S.-

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