Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Detection Gases	VOC, CO2, Formaldehyde (HCHO)
Communication Interface	UART / TTL
Operating Voltage	5V DC
CO2 Measurement Range	400 - 5000 ppm
TVOC Measurement Range	0 - 9.99 mg/m³
Formaldehyde Range	0 - 1.00 mg/m³
Response Time	< 60 seconds
Operating Temperature	-10°C to 50°C
Dimensions	32mm x 20mm x 8mm
Warm-up Time	Approx. 3 minutes

6 reviews

Anonymous

Mar 27, 2026

Rating: 3/5

Works but calibration takes time

The hardware is good, but you really need to let it run in fresh air for a while to calibrate baseline values. Once calibrated, the readings are much more trustworthy. Just be patient during setup.

Anonymous

Mar 27, 2026

Rating: 5/5

Perfect for my smart home project

This module integrates easily with my ESP32 setup. The UART communication is stable, and the data readings seem consistent when compared to my standalone CO2 meter. Great value for a 3-in-1 sensor.

Anonymous

Mar 24, 2026

Rating: 4/5

Solid performance for the price

I am using this to monitor my office ventilation. It alerts me when CO2 levels get too high, helping me stay focused. The VOC sensor is sensitive to alcohol-based cleaners, which is expected behavior.

Anonymous

Mar 20, 2026

Rating: 5/5

Excellent integration capability

The pinout is standard and easy to solder. I appreciate that it outputs digital data directly, saving me from building complex analog conditioning circuits. Works flawlessly with Home Assistant.

Anonymous

Mar 17, 2026

Rating: 5/5

Compact and reliable

Impressed by how small this board is while packing three different sensing capabilities. Documentation was clear enough to get it running in under an hour. Highly recommended for DIY air quality monitors.

Anonymous

Mar 06, 2026

Rating: 4/5

Good accuracy, needs warm-up

The sensor works well once it has warmed up for a few minutes. Initially, the readings fluctuate, but they stabilize quickly. The formaldehyde detection is a nice bonus feature for peace of mind.

5 FAQ

Q: Does this module require an external library for Arduino?

A: Yes, while you can read the raw UART data directly, we recommend using our provided library or generic MH-Z19 compatible libraries to parse the CO2, VOC, and Formaldehyde data easily.

Q: How often should I calibrate the CO2 sensor?

A: We recommend performing a baseline calibration in a well-ventilated outdoor area once every 1-2 months for optimal long-term accuracy, although the module has some auto-calibration features.

Q: What is the power consumption of this module?

A: The average power consumption is approximately 100mA during active measurement. Peak consumption may occur briefly during the internal heating element cycle.

Q: Can this sensor detect carbon monoxide (CO)?

A: No, this specific 3-in-1 module is designed to detect Volatile Organic Compounds (VOC), Carbon Dioxide (CO2), and Formaldehyde (HCHO). It does not detect Carbon Monoxide (CO).

Q: Is the formaldehyde sensor electrochemical or semiconductor?

A: The formaldehyde and VOC components utilize advanced semiconductor sensing technology, while the CO2 component typically uses NDIR (Non-Dispersive Infrared) technology for higher accuracy.

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