If the carbon dioxide sensor is deployed in the battery powered terminal node, it does not meet the requirements of low power consumptionseekDesign principles. Considering the fluidity of the air, a wide range of carbon dioxide concentrations can be considered equal. Therefore, in the design process, the use ofCO2 sensorThe router is deployed on the router node with normal power supply. Ccs811 sensor is a kind of sensor with analog signal output, and its output voltage range is265-326mvThe CO2 concentration should be 350-10000ppm.Through the back-end amplifier circuit, its voltage output range is 0-2v, through the built-in AD converter (analog-to-digital conversion) of ccs811, up to 12 bit analog-to-digital converter can be realizedDigital converter