Strictly speaking, a Theremin uses a pair of antennae that act as capacitors in a specific R/C circuit. Looking at ...

The Sound Sensor is Purchasable Equipment in Phasmophobia. You can place a sound sensor on any wall in an environment to help identify what room a Ghost may be haunting.

Contribute to sparkfun/SparkFun_AS3935_Lightning_Detector_Arduino_Library development by creating an account on GitHub.

arduino-audio Notes, code, and wiring diagrams for common audio modules for small electronic projects ...