Lot's of cars have auto up, at least here in the UK, and many car alarm
systems (such as Clifford) have a "total closure" option so that arming the
vehicle will close all windows/sunroof and lock all doors etc.

But you are correct, the window motors are very powerfull, and capable of
inflicting quite nasty injuries.  I suspect proper systems don't just have a
specific switch off current, but also look for a fixed increase in current
which would make the system far more sensitive.

However, hopefully you wouldn't be leaving children in the car when you are
leaving it long enough to justify arming the alarm.

Cheers

Mike Rigby-Jones

> -----Original Message-----
> From: Chris Eddy [SMTP:ceddy@NB.NET]
> Sent: Thursday, July 15, 1999 3:40 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: car window project
>
> Peter;
> Be wary of closing the window automatically.  The reason that the electric
> windows have a 'auto down' feature but not an 'auto up' feature relates to
> children's arms and heads.
>
> Chris
>
> Peter Marinsek wrote:
>
> > Hello,
> >
> > I'm currently working in a car project where I want to drive opening and
> > closing car windows (car alarm).
> > And the question is:
> > a simple circuit to detect when a DC motor is overloaded (when the
> > window full close or full open the motor current increase)
> >
> > Thanks, Peter