RFHunter V4.0 is an innovative project by Matthew Rogers, a simple hacker from the US, that uses an ESP32, AD8317 RF detector, and other components to create an RF Signal Scanner. The device displays signal strength on an OLED display and is useful for detecting hidden cameras and wiretapping devices. V4 has impressive updates like snapping together without tools, lasting weeks on one battery, and having a boost converter instead of a 9V battery. The detailed build process and wiring instructions ensure proper assembly. The project is open-source under GNU GPLv3, and feedback for improvement is welcome. Ultimately, RFHunter V4.0 is a unique DIY tech project worth exploring.
https://github.com/RamboRogers/rfhunter