A
Anonymous
Apr 09, 2026
Rating: 5/5
Safe and easy
Love the reverse polarity protection. Saves me when kids plug it in wrong during workshops.
Description
MQ-4 Smoke Gas Sensor Module, PH2.0 Anti-Reverse, Compatible with LEGO and Arduino
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Sensor Model | MQ-4 Semiconductor |
| Detection Target | Combustible Gas & Smoke |
| Input Voltage | 3.3V - 5V DC |
| Connector Type | PH2.0 3-Pin Header |
| Protection Feature | Reverse-Polarity Protected |
| Mounting Style | LEGO Technic Compatible |
| Microcontroller Support | Arduino, ESP32, STEMMA |
| Output Signal | Digital DO & Analog AO |
| PCB Dimensions | 32mm x 24mm |
| Operating Temperature | -10°C to 50°C |
5 reviews
A
Anonymous
Mar 27, 2026
Rating: 5/5
Great value
Exactly as described. Detects gas leaks during testing reliably for educational purposes.
A
Anonymous
Feb 04, 2026
Rating: 4/5
Good sensitivity
Works well with standard libraries. Needs a bit of warm-up time before readings stabilize.
A
Anonymous
Jan 25, 2026
Rating: 5/5
Perfect for robotics class
Used this for a student project. The LEGO compatibility made mounting so easy on our chassis.
A
Anonymous
Jan 23, 2026
Rating: 5/5
Solid build quality
The PH2.0 connector is secure. Great for permanent prototypes without soldering.
5 FAQ
Q: How long does calibration take?
A: Please allow 20 to 30 seconds of warm-up time for stable sensor readings.
Q: Is this safe for home alarm systems?
A: This is for hobby and educational use only. It is not certified for life safety applications.
Q: Can I use this with 3.3V boards?
A: Yes, the module supports input voltage ranging from 3.3V to 5V DC.
Q: Does it fit standard LEGO bricks?
A: Yes, the mounting holes align with standard LEGO Technic pin spacing.
Q: What library should I use?
A: Standard MQ sensor libraries available in the Arduino IDE work fine with this module.
![[Corrosion-Resistant] DFRobot Capacitive Soil Moisture Sensor Module Dry/Wet Detection](https://www.gosteppe.com/cache/medium/product/3259/legacy-main-2f0d3454b36b32391d263648.webp)
![[Camizong] Lilith's Claw – Gothic-Style Fork Acrylic Check-In Stick for Badge Display with Magnetic Backing](https://www.gosteppe.com/cache/small/product/269664/legacy-main-61a7c901e7dad39a31ac652a.png)
