How to Measure ROOM CO2 concentration with 20$ sensor "MH-Z19" and Raspberry Pi
MH-Z19 CO2 concentration Sensor This blog post is outdated. The updated version is here . MH-Z19 is a small, low-cost, weigh 15g CO2 sensor module product by 郑州炜盛电子科技 . You can buy it at an online shop like eBay or aliexpress about 20$. The electrical interface of this sensor is compatible with Raspberry Pi. So you can make your D.I.Y. CO2 Monitor with MH-Z19, Raspberry Pi, and MONITOR™. The normal CO2 concentration is about 400ppm. In a poorly ventilated room, the CO2 concentration will soon increase and make you feel drowsy. By ventilation, co2 concentration soon decrease and you can get your head refreshed. You can check your room air freshness by yourself and can protect your health with this. Cabling Connect RPi & mh-z19 as: - 5V on RPi and Vin on mh-z19 - GND(0v) on RPi and GND on mh-z19 - TxD and RxD are connected to cross between RPi and mh-z18 The following are an example of cabling, you can free to use other 5...