MQ-4 Gas Sensor Module for Arduino, detects smoke, methane and flammable liquefied gases

Description

MQ-4 Sensor Module for Arduino, for detecting smoke, methane, and flammable liquefied gases

FC-22 v1.3 Module, with MQ-4 compatible detection capsule for Arduino, MCU, and development kits. It can detect gases, propane, hydrogen, flammable vapors, and a variety of flammable gases with high precision, low cost, and reliability.
The gas sensor’s SnO2 sensitive material has low conductivity in air. In the presence of flammable gases, the sensor’s conductivity increases in proportion to the gas concentration.

The MQ-4 sensor can detect gases, propane, hydrogen, natural gas, flammable vapors, and offers high precision and reliability over time.
It is recommended to use simple circuits to convert changes in conductivity to correspond to the output signal.
MQ-4 Gas Sensor has high sensitivity to Methane, alcohol, smoke, and other flammable substances.

Features:
* Good sensitivity to flammable gases in a wide range
* High sensitivity to Methane
* Long-lasting and low cost
* Simple drive circuit application

Applications:
* Domestic gas leak detector
* Industrial flammable gas detector
* Portable gas detector

Technical specifications:

Detection range: 10 ~ 1000ppm

Operating voltage: 5Vcc

High-quality two-layer PCB, with power presence and output signal (TTL) indicator LEDs

Analog output voltage: 0 ~ 5Vcc (output proportional to the detected concentration)

Connection methods:

1. AD

2. DO

3. GND

4. VCC

We have datasheets available for all components, if not present in the product download sheet, send us a message through the contact us form and we will publish it as soon as possible on our website.

Tutorial: How to use the MQ-4 sensor with Arduino

The MQ-4 module detects smoke, methane, and flammable gases. Perfect for beginners.

What you need

• Arduino Uno
• MQ-4
• USB cable
• power supply

Steps

1. Connect the MQ-4 to the Arduino: VCC to 5V, GND to GND, AO to pin A0
2. Download and install the Adafruit Unified Sensor library
3. Add the necessary libraries to your Arduino project
4. Write a code to read values from the AO sensor
5. Check the output on the Arduino IDE serial monitor
6. Adjust the MQ-4 potentiometer to calibrate sensitivity
7. Test the sensor in different environments to see its reactions
8. Implement an alarm system when values exceed a threshold

Example code

// Inserisci qui lo sketch Arduino completo con esempi di lettura dei dati dal MQ-4

Mini project

Build a domestic alarm system against methane and other flammable gases

Common mistakes

• Connecting the sensor to the wrong pin
• Not calibrating the MQ-4 potentiometer correctly
• Ignoring the technical documentation of the sensor
• Using an inadequate power supply

Recommended accessories

• LCD module to display data
• Relay to control external devices
• Buzzer or LED for visual/auditory alarms
• Protective case for the final project

Frequently asked questions

Does the sensor detect only methane?
No, it also detects other flammable gases and smoke.

How can I calibrate the sensor correctly?
Adjust the MQ-4 potentiometer in a gas-free environment to obtain a base reading.