Peacefair Pzem-004T channel with ESPproMon smartphone app - https://peacefairapp.com/
This is a STEM based project consisting of an AQIX and CWX3 ESP32-C3 Air Quality Monitor IoT Weather Station - SDK Board. The output ThingSpeak data display is from a test site showing examples of data produced from an AQIX board.
Uses the ESP8266-01 with a DHT11 for Temperature and Humidity. Requires Arduino IDE and programming the ESP8266
ESP32 scans a target BLE device to get its RSSI and estimates the distance of the device