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Home / Computer Hardware, Monitors & Peripherals / MQ Series Kit MQ-2 MQ-135 9 Gas Sensor Modules MQ-2/3/4/5/6/7/8/9
Computer Hardware, Monitors & Peripherals

Attributes

Brand -
Category Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals
Origin -
Package Contents 9x Gas Sensor Modules (MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, MQ-8, MQ-9, MQ-135)
Operating Voltage 5V DC
Interface Type Analog Output (AO) and Digital Output (DO)
Heating Voltage 5.0V ± 0.1V
Circuit Voltage 5.0V ± 0.1V
Load Resistance Adjustable Potentiometer
Preheat Time Approximately 24-48 hours for stability
PCB Size 32mm x 20mm per module
Mounting Holes 3mm diameter
Compatibility Arduino, Raspberry Pi, STM32, ESP8266/32

5 reviews

A

Anonymous

Apr 13, 2026

Rating: 5/5

Perfect for University Project

Used the MQ-2 and MQ-135 for my final year project. Reliable data output.

A

Anonymous

Mar 20, 2026

Rating: 5/5

Excellent Starter Kit

All sensors arrived intact. Great for learning how gas detection works.

A

Anonymous

Mar 16, 2026

Rating: 3/5

Documentation is light

Sensors work but you need to look up datasheets online for pinouts.

A

Anonymous

Feb 02, 2026

Rating: 5/5

Bulk buy for our lab

Ordered multiple kits. Consistent quality across all modules.

A

Anonymous

Jan 27, 2026

Rating: 4/5

Good value but needs calibration

Works well with Arduino. Just remember these need warm-up time.

5 FAQ

Q: Do these work with 3.3V logic?

A: Yes, but 5V heating is recommended for accuracy.

Q: Are these safe for home alarm systems?

A: These are for prototyping. Use certified devices for safety.

Q: How long until readings are stable?

A: Typically 24-48 hours initial preheat is best.

Q: Can MQ-7 detect CO?

A: Yes, MQ-7 is sensitive to Carbon Monoxide.

Q: Is the output analog or digital?

A: Both AO and DO pins are available on the board.

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