Contact/pressure switches? Source?

I need to design a switch that works with a Jalousie window and an adapted motor.

Here's a Jalousie window:

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and I'd like to have some sort of contact switch that would switch off a motor driving the opening and closing of the window once it has closed down to a certain pressure to seal out the outside.

What kind of switch am I looking for, and where would I find it?

Reply to
Phil, Squid-in-Training
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