Esp 8266, sensor to know when the sectional door is closed

Projects General Guidance
1

Hy guys

I have a automatically sectional door for my car garage.

I need to pay and install a additional platine to use a relay or some other cable button.
So I don't want a new remote button.

I want to install a sensor, which detect, when the door is closed. That's all

Which sensor can I use???
I don't want to know the position. Only to know if it is closed

Thank you

2

A microswitch operated when the door is closed or a Hall effect sensor near the door and a magnet on the door would be simple solutions

3

Optical (beam break) sensors are also used with such doors. It is important that if there is an obstruction, the door does not attempt to close.