I would like to start off by saying this isn't totally a motion detector. It's as close as I could come to making a realistic, functioning one. It's probably one of my most complected saves. (just shows how simple my saves are.)
Because it only has two buttons, it is quite is to operate.
1. Spark the calibrate button. Some photons should come flying out of the sensor.
2. Wait a little bit after the calibrating light come off, and spark the test button. Some more photons come out, and then nothing happens.
That's because it didn't detect any difference. Follow the next steps to make it detect difference, and make sure you reload it.
1. Spark the calibrate button. Some photons should come flying out of the sensor.
2. Make the metal piece that the photons are bouncing off of higher. Just raise it 18 pixels or more. Don't lower it, that can't be detected.
3. Spark the test button. Some photons should come out, then wait. Once the testing light is off, look over at the alarm. You should notice it spazzing out.

THINGS TO COMPLAIN ABOUT:
1. It only detect increases in height.
2. You can only use it once before having to reload it.
3. It only tests once.
4. You have to calibrate it.
5. It can only detect big differences.
6. (Your complaint here)

@EqualsThree (View Post)
It times how long it takes for the photons to bounce of the metal slab. The unit it measure it in (which isn't really a actual unit of time) is pretty long. and the longer it is, the less actuate it is. But, the shorter it is, the more space is taken up by electronics. I might make it more accurate in the future.