LoRa Ra-2 based Meteo station with using ESP32 controller, Arduino Pro Mini controller, BME680 (Temperature, Humidity, Pressure, Gas), BH1750 (Light intensity), OLED Display SSD1306. Data send to Thingspeak.com.
Using an ESP8266 ESP-01 module and an Arduino Pro Mini 3.3V I wirelessly update all outputs from my thermostat to here for data analysis and because it's cool. This requires a voltage divided rectifier since thermostats run at least 24 VAC RMS.