MH-Z19 MH-Z19C IR Infrared CO2 Sensor Module Carbon Dioxide Gas Sensor

The MHZ19C carbon dioxide gas sensor hereinafter referred to as the sensor is a generalpurpose intelligent small sensor that uses the principle of nondispersive infrared NDIR to detect the presence of C02 in the air And other features builtin temperature compensation simultaneously has serial output PWM output easy to use The sensor is a highperformance 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 50 01 V
Average current lt40mA 5V power supply
Peak current 125 to 5V power supply
Interface level 3 3v compatible with 5v
Measuring range 4005000PPM optional
Output signal serial UART TL level 33V
Warmup time 1min
Response time T90lt 120s
Working temperature 1050degree
Working humidity 095RH no condensation
Pin description
Vin Power in
GND power supplyGND
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 4002000ppm
CO2 Concentration output range 4002000ppm
Period 1004ms5
High level output at the beginning of the cycle 2ms theoretical value
Central period 1000ms5
Low level output at the end of the period 2ms theoretical value
Calculation formula for obtaining current CO2 concentration value by PWM Cppm2000X TH2msTHTL4ms
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