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Serial Port UART PWM Carbon Dioxide CO2 Detection Infrared Gas Sensor Module  MH-Z19E


Product Details:
The MH-Z19E carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor. It has two products: pin and terminal. It uses the principle of non-dispersive infrared (NDIR) to detect CO2 in the air and has good selectivity. , No oxygen dependence, long life, etc.; built-in temperature compensation; also has serial port output, PWM output, easy to use. The sensor is a high-performance sensor made by closely combining mature infrared absorption gas detection technology with precise optical circuit design and sophisticated circuit design.

Sensor characteristics:

  • High sensitivity, low power consumption
  • Excellent stability
  • Temperature compensation, excellent linear output
  • Provide serial port (UART), PWM waveform and other output methods
  • long lasting
  • Anti-water vapor interference, no poisoning



  • HVAC equipment
  • Air quality monitoring equipment
  • Fresh air system
  • Air purification equipment
  • Smart home
  • school


Product model: MH-Z19E
Detection gas: carbon dioxide
Power supply voltage: DC(5.0±0.1)V
Average current: <40mA (@5V power supply)
Peak current: 125 mA (@5V power supply)
Interface level: 3.3V (compatible with 5V)
Measuring range: 400~5000ppm optional
Output signal: serial port (UART) (TTL level 3.3V); PWM
Warm-up time: 1min
Response time: T90 <120s
Working temperature: -10℃~50℃
Storage temperature: -20℃~60℃
Working humidity: 0~95%RH (non-condensing)



1. MH-Z19 Datasheet

2.  MH-Z-CO2-Sensor GitHub library




Carbon Dioxide CO2 MHZ19E Gas Sensor Module  MH-Z19E

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