I have a very weird project. I have a neibour and I am worried that he is 110% motivated to rob me. I have looked over my apartment for weaknesses. I already made a motion activated esp32 cam that emails me if anyone enters my room. I have one more concern I am worried about my ceiling as a easy place to break in. Recently there was construction on my building and the workers left a hatch that goes into above my ceiling. I live in a shady part of town and my neibour is an apartment rober So I am taking all precautions. I want to make a sensor that's attached to a servo that sweeps my roof back and forth looking for any breaches or hopefully holes.
I have some of these
I first thought about using Pir sensors but they wont do enough, then I thought ultra sound but all of my ultrasound sensors only detect from a straight line of sight. so they wont do much then I saw microwave sensors and did not read any absolute facts but I have seen images and advertisements that says stuff like range for some microwave sensor is 30 degrees * 70 degrees and all. In my mind that says that they have not only a single line point to work with but an area. This sounds like what I need. I would imagine I need to use very high frequencies to detect small objects. I have used a lot of sensors but for this topic I wanted to ask more because this is an uncommon project and I don't want to bend over backwards for criminals. Hopefully someone has some more experience with sensors detecting very small objects in large enough areas.