MH-Z19B Infrared CO2 Sensor Module with Pin

The MH-Z19B is a high-performance carbon dioxide gas sensor module designed for both general and specialized use. It employs the non-dispersive infrared (NDIR) principle to detect CO2 presence in the air, offering excellent selectivity, anaerobic gas independence, and a long lifespan. Its built-in temperature compensation feature, along with serial, analog, and PWM outputs, make it easy to use and versatile. The sensor combines mature infrared absorption gas detection technology with a precise optical path design and sophisticated circuit design.

📝 Technical Specifications:

Product Model Number: MH-Z19B

• Gas Detection: Carbon Dioxide
• Supply Voltage: 4.5~5.5V DC
• Average Current: <20mA (@5V power supply)
• Peak Current: 150 mA (@5V supply)
• Interface Level: 3.3V (5V compatible)
• Measurement Range: 0~5000ppm (selectable within the range)
• Warm-up Time: 3min
• Response Time: 90<120s
• Working Temperature: 0～50°C
• Operating Humidity: 0 to 95% RH (non-condensing)

🌟 Key Features:

• Gold-plated gas chamber that is waterproof and corrosion-resistant
• High sensitivity with low power consumption
• Excellent stability and linear output
• Temperature compensation
• Provides serial (UART), analog (DAC), PWM waveform output methods
• Long-lasting lifespan
• Resistant to water vapor interference and non-poisonous

🔧 Applications:

• HVAC refrigeration equipment
• Air quality monitoring equipment
• Fresh air systems
• Air purification equipment
• Smart home systems
• Schools

🔌 Pin Configuration:

• Vin: Power Positive (Vin)
• GND: Negative Power Supply (GND)
• Vo: Analog output
• PWM: PWM
• HD: HD (zero for school, low for more than 7 seconds)
• Rx: UART(RXD) TTL Level Data Input
• Tx: UART (TXD) TTL level data output

📌 Pin Assignment:

• Pin 1: Analog Output Vo
• Pin 2: None
• Pin 3: Negative Power Supply (GND)
• Pin 4: Positive Power Supply (Vin)
• Pin 5: UART(RXD) TTL Level Data Input
• Pin 6: UART (TXD) TTL Level Data Output
• Pin 7: None

📦 Package Includes:

1 x MH-Z19B 0-5000ppm Infrared CO2 Sensor