If you need documents about this product, please contact us. Thank youThe MH-Z19C carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor that uses the principle of non-dispersive infrared (NDIR) to detect the presence of C02 in the air. And other features; built-in temperature compensation: simultaneously has serial output, PWM output, easy to use. The sensor is a high-performance sensor made by closely combining mature infrared absorption gas detection technology with sophisticated optical circuit design and sophisticated circuit design.Product parameters:Detection gas: carbon dioxidePower supply voltage: DC (5.0 ± 0.1) VAverage current: <40mA (@5V power supply)Peak current: 125 to (@5V power supply)Interface level: 3. 3v (compatible with 5v)Measuring range: 400-5000PPM optionalOutput signal: serial UART (TL level 3.3V)Warm-up time: 1minResponse time: T90< 120sWorking temperature: -10-50degreeWorking humidity: 0~95%RH (no condensation)Pin description:Vin: Power +(in)GND: power supply-(GND)PWM: PWMHd: HD (zero calibration, low level is effective for more than 7 seconds)Rx: UART (RXD) TTL level data inputTx: UART (TXD) TTL level data outputOutput method:PWM outputAssume the measurement range is 400-2000ppmCO2: Concentration output range: 400-2000ppmPeriod: 1004ms±5%High level output at the beginning of the cycle: 2ms (theoretical value)Central period: 1000ms±5%Low level output at the end of the period: 2ms (theoretical value)Calculation formula for obtaining current CO2 concentration value by PWM: Cppm=2000X (TH-2ms)/(TH+TL-4ms)Cppm: CO2 concentration value calculated by the unit of ppmTH: the time when the output is high level in one output cycleTL: the time when the output is low in one output cycle
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