miniature limit switch

Other Hardware Sensors
1

Hello!

I am working on a project involving steppers and limit switches.
These switches should be hidden in a 5mm aluminium plate. Therefore I have to find sensors as small as possible. So far, I only found mechanical switches that are 6mm thick. I have read about optical limit sensors that might do the job. Would you have any advice about "ultra miniature sensors" that could be that small and that I could use with an arduino?

Thanks for your help.

2

Hall sensors can be small.
You can find three of them in an old computer fan.
Leo..

3

Thank you wawa.
Can i use any type of magnet to trigger hall sensors?
Is there any chance to interfere with the signal if aluminium parts are really close?

4

There are many hall sensor tutorials online.

Aluminium is non-magnetic.
Try a small neodymium magnet.
You could embed that into the aluminium.
Leo..