Instructables

i need a light and motion sensitive cat scaring device.

i need a noise making motion sensitive device that only works when there is no light.

Thoughts: want to use a plug in (no batteries) light sensitive night light (these come on when it's dark) and have it power something that is a motion sensitive noise maker that would scare a cat.  the point being these would go in a bathroom and i only want them to be active if the lights are out.

hopefully cheap as I need to make two of these. willing to rip apart toys or other electronics that are easy to get.

Thanks for any advice

mwrenfro4 years ago
Two words: Blender Defender. Adjust as needed. For example, in case you don't want to include the blender itself.

+1, and that's some very entertaining video!
I have such a device. It's called a "dog".
Best answer :-)
acidbass4 years ago
motion detector(cheap battery operated) and some have lights that light up when activated
orksecurity4 years ago
May I ask (1) why you don't want the cats in the bathroom, and (2) why simply closing the door wouldn't be cheaper, more effective, and more humane?
rickharris4 years ago
apparently flashing LEDs work - Red ones particularly as they think they are another animals eyes.