User:Chotee/ultranoise

TLDR

• What: Area denial for rodents by ways of random noise
• How: Get a bunch of tweeters and drive them hard at ultra-sonic frequencies.
• When: When the space is closed.

Please note: This project is a copy/inspired by a build Julf did: The Ultrasonic Wall Of Sound https://imgur.com/a/aES9I9W .

Longer Explanation

The idea is to have a µC output random noise in the 25K to 70Khz range since it's very likely there's spillover into the <20K range, we hook it in so that it only runs then the space is closed.

Parts needed:

• MicroController with network
• Tweeters
• Amplifier that does these frequencies well (normal audio have low performance at these frequencies)
• Case/housing
• Some Indicator lights (power, network-ok, active)
• Power source.

Notes:

• Random patterns work best. Unpredictable patterns.

Ideas:

• Get the state from the MQTT topic
• Have a 5 min delay on the activation

Possible parts:

• https://www.aliexpress.com/item/ultrasonic-piezo-transducer-40khz-60W-for-ultrasonic-cleaning-tank-40khz-frequency-cleaning/32965377938.html

Similar commercial products:

• https://www.amazon.co.uk/Victor-PestChaser-Ultrasonic-Repeller-Control/dp/B008O3GDIS?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duc08-21&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B008O3GDIS

References:

• About Ultrasound speakers: https://www.diyaudio.com/forums/planars-and-exotics/212650-ultrasound-speaker-20khz.html