Demo of a neat use for the ESP-201 WiFi module. Zero programming necessary! Just plug it in!. I used an external antenna and the "WiFi Analyzer" Android app from Google Play Store from the developer "farproc" with the phone placed inside a can wrapped in aluminum foil.
Alternatively, you can use the app + the metal can to locate a drone that has built-in Wi-Fi, without needing a beacon.
ESP-201:
https://www.banggood.com/ESP8266-ESP-201-Remote-Serial-Port-WIFI-Transceiver-Wireless-Module-p-964288.html?p=B60120609630201406TZ
I am working on a longer range location system so stay tuned!
More projects and gadgets @ www.makersa.ga