1PCS MH-Z19B Infrared Carbon Dioxide Monitor Sensor CO2 Detection Sensor Module UART PMW Wave Output 0-5000ppm+Cable
Details
- BrandAITRIP
- Power SourceGas Powered
- AlarmAudible
- Operating Humidity95 percent
- Materialgold
- ManufacturerAITRIP
Description
🌬️ Breathe smarter, live better — CO2 sensing redefined!
- VERSATILE OUTPUT MODES - Seamlessly integrates with UART, analog, and PWM systems
- PLUG PLAY INTEGRATION - Ready for HVAC, smart homes, schools, and air purification setups
- PRECISION CO 2 DETECTION - NDIR tech ensures ultra-accurate air quality insights
- SMART TEMPERATURE COMPENSATION - Maintains accuracy with built-in thermal adjustments
- ROBUST ENVIRONMENTAL ADAPTABILITY - Operates reliably up to 95% humidity for real-world conditions
The MH-Z19B is a compact, high-performance NDIR CO2 sensor module offering precise carbon dioxide detection from 0 to 5000 ppm. Featuring built-in temperature compensation and multiple output interfaces (UART, analog, PWM), it ensures seamless integration into HVAC, air quality monitoring, and smart home systems. Designed for durability with up to 95% operating humidity tolerance, it delivers reliable, real-time air quality data for healthier environments.
Specifications
| Operating Humidity | 95 percent |
| Alarm | Audible |
| Power Source | Gas Powered |
| Material Type | gold |
Reviews
H**D
Works as advertised - Happy camper!
The media could not be loaded. On arrival, I hooked the sensor up to 5 volts, and sent the output to my rather ancient scope. Movie attached. Scope is set on 0.1 seconds per division on the time axis, and is triggering on the PWM pulse rising edge. Pulse width is thus about 200 milliseconds on room air, and if I blow on the sensor, the pulse width becomes longer. Y-axis voltage is 2v per division, so the pulse height is about 3 volts. A nice Tek digital storage scope would be nice about now, but I'm fresh out.Plan is to hook the sensor to an Arduino, measure the pulse width, and convert the time to ppm CO2.
S**E
Unreliable over long periods
Unsure what to do with this thing. On a fresh boot it seems happy and sends sane-looking values, but eventually it'll just freak out and start sending 5000ppm/122F constantly. Rebooting it fixes it but resets calibration which makes it useless.
B**L
DOA, and then all better
Update: The new sensor works great. Just had some bad luck I guess.Sensor did not show any activity on uart or pwm. Vo seemed to occasionally alternate between 0.54V and 0V. Luckily Amazon is nice when this happens. I will get another one and then update my review. Btw it was indeed a genuine sensor, though there was some light corrosion on the bottom of the board.
A**R
Very consistent. A real MHZ19B with 10,000ppm Range
I built this into an air quality monitor. The ad says 5k ppm range but mine goes to 10k. (im happy about this)The temperature reading of this thing is not very good for measurement, but it compensates the co2 reading and serves that function well.I used to have an MG811 and this is far superior at half the cost and 1/10th the power requirements. I ran this with an ESP32, oled screen and bmp280 powered by a single 18650 for 20 hrs. Would buy again.
D**W
Appears Genuine
Appears to be a genuine MH-Z19B. Using the UART interface, I get readings that appear accurate.The unit does require a few minutes to preheat, and during that time it will report a reading of zero.
N**.
Wire harness color-code pinout - MH-Z19B
Wire harness color-code pinoutMH-Z19B1-Brown Vo2-White3-Black GND4-Red Vin5-Blue RX6-Green TX7-Yellow
A**E
Works great
I am using the MH-Z19B C02 sensor in my bedroom with a ESP32 to enable outside air ventilation when the CO2 level reaches a set point. Works great and helps with keeping me healthier.
E**G
Received a genuine part!!
I was worried that this may be a counterfeit unit. It was not. Great product.
Common Questions
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