#asknostr #ultrasound #DIY #nerds #help

Been researching ways to create DIY minature ultrasound wave emitter for the 17-20 kHz range, looking for help or pointers to anything similar out there in the wilds...

I wish to build an 'inaudiable to humans' wearable ultrasound generator for protection from digital microphones and recording devices. Range 1.5-3 meters away from wearer. I have found some Arduino projects for pest-control and sonography using their board but it seems their standard ultrasound distance measuring module does not go to the right ultrasound range I am seeking for this...

Imagine having a personal ultrasound forcefield that emits static noise for microphone but not for anyone you are speaking with directly.

Whatever I build is FOSS, ideally the device will use a generic ESP32 and some small speakers with the right piezoelectric crystals.

Starting point for this rabbit hole: https://github.com/skewyapp

Ultrasound crystals: https://biologyinsights.com/what-are-ultrasound-crystals-and-how-do-they-work/

Any pointers or tips welcome