Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Detection Range	0 - 5000 ppm
Output Interface	UART, PWM, Analog
Operating Voltage	4.5V - 5.5V DC
Accuracy	±(50 ppm + 5% reading)
Response Time	< 120 seconds
Operating Temperature	-10°C to 50°C
Dimensions	33mm x 20mm x 9mm
Calibration Method	Automatic Background Calibration (ABC)
Lifetime	> 10 years
Application	Greenhouse Monitoring, HVAC, Indoor Air Quality

6 reviews

Anonymous

Mar 22, 2026

Rating: 5/5

Perfect for my tomato greenhouse

I installed three of these modules in my commercial greenhouse to monitor CO2 levels for optimal plant growth. The UART output makes it incredibly easy to integrate with my Arduino-based logging system. Readings are stable and match my handheld reference meter closely.

Anonymous

Mar 20, 2026

Rating: 4/5

Good accuracy, compact size

The small form factor allowed me to fit it into a tight enclosure near the intake fan. Accuracy seems good compared to more expensive industrial units. Only wish the cable was a bit longer, but that's a minor issue.

Anonymous

Mar 19, 2026

Rating: 5/5

Robust performance in humid conditions

We tested this in a high-humidity environment typical of mushroom cultivation. The sensor held up well without drift issues. The long lifetime rating gives us confidence for long-term deployment.

Anonymous

Mar 14, 2026

Rating: 5/5

Easy integration with Raspberry Pi

Connected this to a Raspberry Pi Zero for a smart ventilation project. The documentation provided by the manufacturer was clear, and I had data flowing into my dashboard within an hour. Highly recommended for hobbyists and pros alike.

Anonymous

Mar 10, 2026

Rating: 4/5

Reliable but needs warm-up time

The sensor works great once it has warmed up for about 3 minutes. Initial readings can be a bit off, but after that, it provides consistent data. The PWM output is handy for quick checks without a microcontroller.

Anonymous

Mar 09, 2026

Rating: 5/5

Excellent value for precision agriculture

We use these across multiple hydroponic setups. The automatic background calibration feature is a lifesaver, reducing maintenance tasks. Build quality feels solid, and the pinout is clearly labeled on the PCB.

5 FAQ

Q: Is this suitable for detecting dangerous CO2 leaks in confined spaces?

A: While this sensor detects CO2 levels accurately up to 5000 ppm, it is designed primarily for agricultural and HVAC monitoring. For personal safety alarms in potentially lethal environments, please use dedicated industrial safety equipment certified for life-safety applications.

Q: Does this sensor require manual calibration?

A: The MH-Z14 features Automatic Background Calibration (ABC), so manual calibration is generally not required under normal operating conditions where CO2 levels drop to fresh air levels periodically.

Q: Can I power this directly from a 3.3V logic board?

A: No, the operating voltage range is 4.5V to 5.5V. You must provide a 5V power source. However, the UART TX pin outputs 3.3V logic, making it safe to connect directly to 3.3V microcontrollers like the ESP8266 or Raspberry Pi.

Q: What is the maximum distance for the UART connection?

A: For reliable communication, we recommend keeping the UART cable length under 1 meter. If you need longer distances, consider using a signal converter or RS485 interface.

Q: How often does the ABC calibration cycle run?

A: The Automatic Background Calibration typically adjusts the baseline every 24 hours, assuming the sensor experiences fresh air levels (approx. 400 ppm) at least once during that period.

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