This application can be used to find Wifi devices in your home.
It uses the onboard LED of the esp32-cam board to show signal strength.
The Led is on IO-Pin 4, change that if your boards LED is different.
The blink frequency is 5 seconds if no signal detected.
It then increases up to 25Hz, the nearer you get to a wifi device.
As wifi activity is usually quiet with occasional packets being transfered, this detector works best in heavy transfers.
It works in monitor mode and scans channels 1 to 13.
It is assumed you are familiar with setting up and using the esp32 environment.
You need ESP-IDF from: https://github.com/espressif/esp-idf The crosscompiler from: https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz
I compiled the project using Ubuntu with crosscompiler and make.
Goto cam_server directory and edit the sdkconfig file to update your wifi AP settings.
Then type "make" to compile the project.
It also possible to use the Arduino IDE.