Hi there. i need a solution - something to makes a sound when someone is entering a room

Thread Starter

disturbed123

Joined Jun 11, 2020
63
it is a summer and i would like to work on open door and not to think who`s gonna enter and steal something

thanks in advance

i dont pay for security services when i am not at work and do not have such equipment. i need the cheapest item.
 

Thread Starter

disturbed123

Joined Jun 11, 2020
63
i have glass door that is opening to external world direction. i want the door to be fully opened to have some fresh air and just install some sensor like in security systems and when that sensor detects something to make a sound
 

BobTPH

Joined Jun 5, 2013
3,308
I bought a small device that did this at the dollar store, just to see how it worked. It basically had a photocell at the end of a tube about 5mm is diameter an 15mm long. Worked better than expected. If placed where the person would throw a shadow, it could work for you at very low cost.

Bob
 
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