Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Brand	TELESKY
Model Number	MQ-9
Detection Gas	Carbon Monoxide, Combustible Gas
Operating Voltage	5V DC
Output Signal	Digital Switch Output (0 and 1)
Analog Output	Yes (0-5V)
Preheat Time	Approx. 24 hours
Interface Type	3-Pin Header (VCC, GND, DO)
Dimensions	32mm x 20mm x 15mm
Application	Home Safety, Industrial Monitoring, DIY Projects

6 reviews

Anonymous

Mar 31, 2026

Rating: 3/5

Functional but calibration takes time

The module functions correctly, but be patient with the calibration process. It took a few days of continuous power to get stable readings in our workshop environment. Good product overall once settled.

Anonymous

Mar 29, 2026

Rating: 5/5

Ideal for university projects

Used this for my final year engineering project on indoor air quality. The documentation provided by the seller helped me understand the circuit diagram quickly. Highly recommended for students.

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect for my Arduino safety project

This sensor module works exactly as described. I connected it to my Arduino Uno and had readings within minutes after the initial preheat. The digital output threshold is adjustable via the potentiometer, which is very handy.

Anonymous

Mar 14, 2026

Rating: 4/5

Works well with Raspberry Pi

Integrated this into a home monitoring system using a Raspberry Pi. The analog reading allows me to graph gas levels over time. Only downside is the power consumption is slightly higher than expected during preheating.

Anonymous

Mar 12, 2026

Rating: 4/5

Good sensitivity, needs warm-up

The sensor is quite sensitive to gas leaks during testing. Just remember that it requires a long preheat time (about 24 hours) before the first use to stabilize the baseline. Once warmed up, it performs well.

Anonymous

Mar 02, 2026

Rating: 5/5

Great value for money

For the price, you cannot beat this module. It includes both analog and digital outputs, making it versatile for different microcontrollers. The PCB quality looks solid and the pins are well-soldered.

5 FAQ

Q: Is the output voltage compatible with 3.3V logic systems?

A: The module operates at 5V. While the analog output scales with voltage, the digital output high level will be near 5V. For 3.3V systems like some ESP32 configurations, a voltage divider or logic level shifter is recommended for the digital pin.

Q: Does this module require an external library to work with Arduino?

A: No external library is strictly necessary for basic usage. You can read the digital output using a standard digitalRead() function and the analog output using analogRead().

Q: How do I adjust the sensitivity threshold for the digital alarm?

A: There is a blue potentiometer on the back of the PCB. Rotate it clockwise to increase sensitivity (trigger at lower gas concentrations) and counter-clockwise to decrease it.

Q: Can this detect natural gas or only carbon monoxide?

A: The MQ-9 sensor is designed to detect Carbon Monoxide (CO) as well as combustible gases like LPG, Propane, and Methane (natural gas).

Q: What is the exact preheat time required before the sensor is accurate?

A: We recommend a preheat time of at least 24 hours for the first use to ensure the sensor element stabilizes. Subsequent power cycles may require less time, but 20-30 minutes is advisable.

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