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Noise cat scarer device with with motion detection Answered

I need a cat/pet scarer device. 

Main problem: Indoor housecats scratch bedroom doors during the night. 

Observations: I''ve had partial success with a comercial product called "Ssscat Cat Spray Control System". It uses motion detection and a bottle of compressed air, shooting a burst of air on detection. The concept is good, but it's not easily available anymore and was a bit expensive. It seems that cats are more scared of the sound it makes than the burst of air. 

Ideas: I was hoping to use a "Pyroelectric Infrared IR Motion Sensor Detector Module" and a small audio speaker to make a static sound (white noise) to accomplish a goal similar to commercial solution. A sound loudness slightly above normal talking sound would be enough.  The sound legth should be about one second. Maybe two LEDs lighting at the same time would also help. I would need about 2-5 such devices. They would have to be battery operated with an on/off switch. 

Could such devices be easily built from components? If so, I would need on finding the right components and instruction on building the device. I have only basic skills like soldering and tinkering, but I don't know how to design electronic devices more complicated than simple LED projects. 


You can buy motion-sensitive ultrasonic cat scarers - they're supposed to be used in gardens, to prevent other folk's cats messing in your garden, but you could always stand one in the right place to sense cats going near bedrooms.

Apparently they are on all the time. That's probably not good for indoor cats.

Google tells me they are motion sensitive, so that the noise starts when the cat is near, creating the deterrent surprise.

The bigger question would be: Why does the cat want in and why is the door closed?
Once a cat is used to open doors and rooms a closed door (especially with someone behind it) will always make the cat want to join and check.
The cheapest way I know it sticky tape.
Fold the end over so you can place it on the door.
Cat scratches (if not scared enough from the tape) and tangles up in tape.
After you removed the tape from the cat it might try again but usually twice is enough for them to avoid the discomfort of the tape removal.
This way I trained mine that the kitchen and bench tops are no go zones...

These are indoor cats. They do stuff at night. Why - I don't know. If the bedroom door is closed the cats come during the night and wake us up by jumping into bed.

Sticky tapes seemed to work for a small ammount of time but did not provide a long term solution. Tapes were also a bit messu to set up each night and collect away in the morning.