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Download the libraries file CCS811 and code from the link: https://fs.keyestudio.com/KS0457 Technical Parameters Working voltage: DC 5V Working current: 30mA Maximum power: 46mW eCO2 measurement range: 400-8192 ppm TVOC measurement range: 0 to 1187ppb Working temperature: -25 ~ +65℃ Interface: 7pin (2.54mm pitch) Positioning hole diameter: 3mm Dimensions: 36mm*20mm*7mm Environmental attributes: ROHS PINOUT: GND——Ground VCC——Input power(5V) SDA——I2C data pin SCL——I2C clock pin RST——Reset pin: connect to ground, sensor will automatically reset. WAKE——WAKE pin should connect to ground to communicate with sensor conveniently INT——This is the interrupt output pin that detects when a new reading is ready or the reading becomes too high or too low.