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The
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
CO2 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 dioxide
Power supply voltage: DC (5.0 ± 0.1) V
Average current: <40mA (@5V power supply)
Peak current: 125 to (@5V power supply)
Interface level: 3. 3v (compatible with 5v)
Measuring range: 400-5000PPM optional
Output signal: serial UART (TL level 3.3V)
Warm-up time: 1min
Response time: T90< 120s
Working temperature: -10-50degree
Working humidity: 0~95%RH (no condensation)
Pin description:
Vin: Power +(in)
GND: power supply-(GND)
PWM: PWM
Hd: HD (zero calibration, low level is effective for more than 7 seconds)
Rx: UART (RXD) TTL level data input
Tx: UART (TXD) TTL level data output
Output method:
PWM output
Assume the measurement range is 400-2000ppm
CO2: Concentration output range: 400-2000ppm
Period: 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 ppm
TH: the time when the output is high level in one output cycle
TL: the time when the output is low in one output cycle