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