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MQ-4 Methane and Natural Gas Sensor Module (CH4)
100.00 EGP
MQ-4 gas sensor module for detecting methane (CH4) and natural gas. Analog output plus an adjustable digital alarm output (LM393 comparator). Works on 5V; ideal for gas-leak alarm projects with Arduino.
| Weight | 0.01 kg |
|---|---|
| Dimensions | 3.2 × 2.2 × 2.7 cm |
7 in stock
Description
MQ-4 Methane & Natural Gas Sensor Module
The MQ-4 module detects methane (CH4) and natural gas. It is highly sensitive to methane and has low sensitivity to alcohol and smoke, which makes it a good choice for gas-leak alarms, kitchen-safety projects and Arduino / ESP32 learning kits.
Note: the MQ-4 is not designed to detect carbon monoxide (CO). For CO use the MQ-7; for LPG / butane use the MQ-2 or MQ-6.
Specifications
| Target gases | Methane (CH4), natural gas |
| Detection range | 300 – 10,000 ppm |
| Supply voltage | 5V DC |
| Heater power | up to approx. 900 mW (about 150 mA at 5V) |
| Analog output (AO) | 0 – 5V, higher voltage = higher gas concentration |
| Digital output (DO) | HIGH/LOW, threshold set with the on-board potentiometer (LM393 comparator) |
| Indicators | Power LED, DO LED |
| Pins | VCC, GND, DO, AO |
| Module size | approx. 32 × 22 × 27 mm |
Usage tips
- Warm-up: allow a few minutes after power-on before reading. For stable, calibrated readings, run the sensor powered for 24 – 48 hours on first use (burn-in).
- Readings are relative: note the AO value in clean air, then set your alarm threshold above it.
- AO can reach 5V. With 3.3V boards (ESP32, Raspberry Pi Pico) use a voltage divider; Raspberry Pi needs an external ADC.
- The sensor head becomes warm/hot during normal operation – this is normal.
- For learning and prototyping only – this module is not a certified safety gas detector.
Package includes
1 × MQ-4 gas sensor module
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