The CJMCU-811 is an advanced digital air quality sensor that measures ambient eCO2 (equivalent Carbon Dioxide) and TVOC (Total Volatile Organic Compounds) levels. Unlike the analog MQ series, it directly transmits the measurements over the I2C protocol, processing them with its in-house microcontroller. Since it works with 3.3V logic level, it is recommended to be used with a level converter in 5V systems. With its low power consumption and high sensitivity, it is an ideal option for smart home, ventilation (HVAC) and professional indoor monitoring projects.
