Cheap wireless door switches ?

[ksor]

I'm planing adding some facilities to my burgler alarm in my house - it's wired between units

I want to add some 'mount on the door frame and listen' for an 'open' signal in my Arduino main system.

DO you have any experience with some CHEAP and easy to use ones ?

[ruilviana]

Use reed relays....

Reed relay

[ksor]

Do you know what "wireless" means

[EmilyJane]

Like this?

[Paul_KD7HB]

A search for wireless door alarm found many possible to choose from. Your Arduino will need to listen to the system receiver to monitor the alarm condition.