My own device based on ESP8266. Sensor for temp, humm and pressure is BME280. Second sensor is MH-Z19 for CO2 concentration. Device located at office or home, Moscow, Russia.
Stacja pogodowa - Międzyrzec Podlaski. Pomiar temperatury, wilgotności i ciśnienia.
detect temprature and humidity by dht11,ethanol gas by mq3 sensor
Scheme to use drier Outside air to minimize basement dehumidifier run time
measurement of tempreture,humidity and ethanol gas using dh11 and mq3 sensor