User:Chotee/ultranoise: Difference between revisions
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= TLDR = | = TLDR = | ||
What: Area denial for rodents by ways of random noise | * What: Area denial for rodents by ways of random noise | ||
How: Get a bunch of tweeters and drive them hard at ultra-sonic frequencies. | * How: Get a bunch of tweeters and drive them hard at ultra-sonic frequencies. | ||
When: When the space is closed. | * 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. | 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. | ||
Latest revision as of 10:51, 5 April 2019
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:
Similar commercial products:
References:
- About Ultrasound speakers: https://www.diyaudio.com/forums/planars-and-exotics/212650-ultrasound-speaker-20khz.html