Inverted button

thingiverse

I've used an inverted door switch like the one you see in my Fridge. I've automated turning on lights in my wardrobe with it. The printed parts have holes for wires and require additional soldering: Glue a conductive element onto the piston jacket. Solder the output wire to the conductive element. Solder the second wire to the conductive element inside the piston (I used my girlfriend's hairpin). Add a spring (I used a ball-pen spring) inside the piston jacket. Attach the base to the piston jacket. Insert the piston into the spring-loaded jacket. Put the conductive element (the hairpin part in my case) into the pre-made holes of the piston to secure it inside the jacket. This will create a stopper that closes the circuit. You're now ready to use this inverted button in your project of choice. You can screw the base, which has a 90-degree angle, into your door or closet. If you want a straight mount option instead of a corner mount, let me know in the comments section. (Tip: Use it on the inner part of the door, closer to the hinges, to avoid false triggering.)