MQ-4 Sensor for Arduino, for Smoke, Methane and Liquefied Flammable Gas Detection

Description

What it is

The MQ-4 sensor is an Arduino device designed to detect smoke, methane, and other flammable gases. It is suitable for various types of applications that require safety against these agents.

Features

• Detects smoke, methane, and flammable liquefied gases

What it is for

Ideal for home or industrial security projects that require detection of flammable gases. You can use it to build a smoke alarm system based on Arduino in 30 minutes.

Tutorial: How to use MQ-4

The MQ-4 sensor is ideal for detecting smoke, methane, and other flammable gases. Useful for home and industrial security projects.

What you need

• MQ-4
• Arduino
• 10kΩ resistor
• Power cable

Steps

1. 1. Mount the sensor on the circuit, with the VCC pin at 5V, GND at GND, and OUT to a digital pin of Arduino.
2. 2. Connect a 10kΩ resistor between the OUT pin and GND.
3. 3. Load the code onto your Arduino.
4. 4. Check the datasheet for the resistance after heating up.
5. 5. Configure the settings for gas detection.
6. 6. Test the flammable gas sensor.
7. 7. Check the sensor’s response in the presence of smoke.
8. 8. Adapt the sensor to your project.

Example code

```void loop() {  int value = analogRead(A0);  Serial.println(value);  delay(1000);}

Mini project

Build a smoke alarm system based on MQ-4 and Arduino in 30 minutes.

Common mistakes

• Omit the pull-down resistor.
• Connect the sensor directly to GND.
• Use an analog pin instead of a digital pin.
• Omit the datasheet check.

Recommended accessories

• Arduino UNO
• Smoke sensors
• Connection cables
• Electronic kit

Frequently asked questions

Does the sensor react to all flammable gases?
No, it mainly reacts to methane and smoke.

Can I use the sensor with Arduino Nano?
Yes, it is compatible with any Arduino.

How long does it take to power up?
Check the datasheet for exact times.

Does the sensor work well in extreme conditions?
Check the datasheet for temperature and operating conditions.