The MH-Z19B is a compact, high-performance CO₂ sensor that uses NDIR (Non-Dispersive Infrared) technology to detect carbon dioxide concentrations in ambient air. With features like auto-calibration, low power consumption, and multiple output interfaces, it is perfectly suited for use in HVAC systems, air purifiers, IoT devices, smart homes, and educational kits.
It provides stable and accurate readings and is easy to integrate via UART or PWM output, making it ideal for indoor air quality monitoring.
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Detection Gas: Carbon Dioxide (CO₂)
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Detection Range: 400 – 5000 ppm
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Detection Principle: Non-Dispersive Infrared (NDIR)
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Accuracy: ±(50 ppm + 5% of reading)
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Output Interface: UART (3.3V TTL), PWM
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Operating Voltage: 4.5 – 5.5V DC
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Current Consumption: ≤ 20 mA (average), ≤ 150 mA (peak)
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Response Time (T90): < 120 seconds
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Operating Temperature: 0°C to +50°C
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Operating Humidity: 0–90% RH (non-condensing)
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Dimensions: 33 × 20 × 9 mm
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Life Span: ≥ 5 years (typical indoor use)
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Applications:
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Indoor air quality monitoring
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Smart home devices
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Ventilation and HVAC systems
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Greenhouses and classrooms
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CO₂ safety alarms
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