MQ-4 Natural Gas Sensor Module For Methane(CNG) gas Detector Module Documentation

Name

MQ-4 Natural Gas Sensor Module For Methane (CNG) Gas Detector Module

Description

The MQ-4 Natural Gas Sensor Module is a highly sensitive and reliable gas detection module designed to detect methane (CNG) gas concentrations in the air. This module is widely used in various applications, including industrial, commercial, and residential settings, to ensure safety and monitor gas leaks.

Functionality

The MQ-4 Natural Gas Sensor Module is designed to detect the presence of methane (CNG) gas in the air and provide an analog output signal proportional to the gas concentration. The module uses a sensitive tin dioxide (SnO2) semiconductor sensor, which changes its resistance in response to changes in gas concentrations. The sensor's output is amplified and processed by an onboard operational amplifier, providing a stable and accurate signal.

Key Features

High Sensitivity: The MQ-4 sensor has a high sensitivity to methane (CNG) gas, allowing it to detect concentrations as low as 200 ppm.
Wide Detection Range: The module can detect methane (CNG) gas concentrations ranging from 200 ppm to 10,000 ppm.
Analog Output: The module provides an analog output signal (0-5V) proportional to the gas concentration, allowing for easy interfacing with microcontrollers, Arduino boards, or other digital systems.
Low Power Consumption: The module operates at a low power consumption of 5V DC, making it suitable for battery-powered devices.
Compact Design: The module features a compact design, making it ideal for integration into a wide range of applications, including portable gas detectors, air quality monitoring systems, and industrial process control systems.
Easy Installation: The module comes with a simple installation process, requiring only a 5V power supply and a analog input connection to a microcontroller or other digital system.
High Reliability: The MQ-4 sensor is highly reliable and stable, with a long lifespan and low drift, ensuring accurate and consistent gas detection.
Operating Temperature: The module operates reliably over a wide temperature range of -20C to 50C, making it suitable for various environmental conditions.
RoHS Compliance: The module complies with the Restriction of Hazardous Substances (RoHS) directive, ensuring a safe and environmentally friendly design.

Supply Voltage

5V DC

Current Consumption

150mA (typical)

Output Signal

Analog (0-5V)

Sensitivity

200 ppm to 10,000 ppm

Detection Gas

Methane (CNG)

Sensor Type

Tin dioxide (SnO2) semiconductor

Operating Temperature

-20C to 50C

Storage Temperature

-20C to 80C

Humidity

5% to 95% RH

Gas Leak Detection

Early detection of methane (CNG) gas leaks in industrial, commercial, and residential settings.

Air Quality Monitoring

Continuous monitoring of methane (CNG) gas concentrations in air quality monitoring systems.

Industrial Process Control

Integration into industrial process control systems to monitor and control methane (CNG) gas concentrations.

Portable Gas Detectors

Integration into portable gas detectors for personal safety and protection.

Safety Precautions

Handle the module with care to avoid damage or electrical shock.

Avoid exposure to high temperatures, humidity, or corrosive substances.

Follow proper installation and operation procedures to ensure accurate and reliable gas detection.

By combining high sensitivity, wide detection range, and low power consumption, the MQ-4 Natural Gas Sensor Module provides a reliable and accurate solution for methane (CNG) gas detection in various applications.

Pin Configuration

MQ-4 Natural Gas Sensor Module Documentation
Overview
The MQ-4 Natural Gas Sensor Module is a highly sensitive and reliable sensor module designed for detecting methane (CNG) gas concentrations in the air. It is widely used in various applications such as industrial, commercial, and residential gas detection systems.
Pinout Description
The MQ-4 Natural Gas Sensor Module has a total of 6 pins, which are labeled and described below:
Pin 1: VCC (Power Supply)
Function: Power supply pin for the sensor module
Voltage: Typically 5V (can operate from 4.5V to 5.5V)
Current: Maximum 150mA
Connection: Connect to the positive terminal of the power supply (e.g., 5V from Arduino or Raspberry Pi)
Pin 2: GND (Ground)
Function: Ground pin for the sensor module
Connection: Connect to the negative terminal of the power supply (e.g., GND from Arduino or Raspberry Pi)
Pin 3: DO (Digital Output)
Function: Digital output pin that provides a high or low signal depending on the gas concentration
Logic: Active low (i.e., 0V indicates gas presence, VCC indicates no gas)
Connection: Connect to a digital input pin of a microcontroller (e.g., Arduino or Raspberry Pi) to read the sensor output
Pin 4: AO (Analog Output)
Function: Analog output pin that provides a voltage signal proportional to the gas concentration
Range: 0V to VCC (typically 0V to 5V)
Connection: Connect to an analog input pin of a microcontroller (e.g., Arduino or Raspberry Pi) to read the sensor output
Pin 5: HEATER (Heating Element)
Function: Heater element for the sensor module
Voltage: Typically 5V (can operate from 4.5V to 5.5V)
Current: Maximum 150mA
Connection: Connect to the power supply (e.g., 5V from Arduino or Raspberry Pi) to enable the heater
Pin 6: NC (No Connection)
Function: No internal connection; reserved for future use
Connection: Leave unconnected
Connecting the Pins
To connect the MQ-4 Natural Gas Sensor Module to a microcontroller (e.g., Arduino or Raspberry Pi), follow these steps:
1. Connect the VCC pin (Pin 1) to the positive terminal of the power supply (e.g., 5V from Arduino or Raspberry Pi).
2. Connect the GND pin (Pin 2) to the negative terminal of the power supply (e.g., GND from Arduino or Raspberry Pi).
3. Connect the DO pin (Pin 3) to a digital input pin of the microcontroller (e.g., D2 on Arduino Uno).
4. Connect the AO pin (Pin 4) to an analog input pin of the microcontroller (e.g., A0 on Arduino Uno).
5. Connect the HEATER pin (Pin 5) to the power supply (e.g., 5V from Arduino or Raspberry Pi) to enable the heater.
6. Leave the NC pin (Pin 6) unconnected.
Note: Before connecting the sensor module, ensure that the power supply voltage and current ratings are compatible with the module's requirements. Additionally, follow proper safety precautions when handling and using the sensor module, as it is sensitive to gas concentrations and may require calibration.

Code Examples

MQ-4 Natural Gas Sensor Module Documentation

Overview

The MQ-4 Natural Gas Sensor Module is a highly sensitive and accurate gas detector module designed to detect methane (CNG) gas concentrations in the air. This module is ideal for use in a wide range of applications, including industrial, commercial, and residential gas leak detection systems.

Technical Specifications

Sensor Type: MQ-4 gas sensor
 Detection Gas: Methane (CNG)
 Detection Range: 300-10000 ppm
 Sensitivity: 1.5-2.5 V (at 10000 ppm)
 Analog Output: 0-5V
 Power Supply: 5V
 Operating Temperature: -10C to 50C
 Operating Humidity: 5-95% RH

Pinout

The MQ-4 Natural Gas Sensor Module has a 5-pin interface:

VCC: Power supply (5V)
 GND: Ground
 OUT: Analog output (0-5V)
 DOUT: Digital output (optional)
 G: Heating element (not connected in this module)

Code Examples

### Example 1: Basic Analog Output Reading (Arduino)

In this example, we'll connect the MQ-4 module to an Arduino board and read the analog output voltage to determine the methane gas concentration.
```c
const int sensorPin = A0;  // Analog input pin

void setup() {
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(sensorPin);
  float voltage = sensorValue  (5.0 / 1023.0);
  Serial.print("Methane concentration (ppm): ");
  Serial.println(getPPMFromVoltage(voltage));
  delay(1000);
}

float getPPMFromVoltage(float voltage) {
  // Calibration curve: ppm = (voltage - 1.1) / 0.1
  return (voltage - 1.1) / 0.1;
}
```
### Example 2: Digital Output with Threshold (Raspberry Pi)

In this example, we'll connect the MQ-4 module to a Raspberry Pi and use the digital output to detect methane gas concentrations above a certain threshold.
```python
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)  # Digital input pin

def get_gas_concentration():
    if GPIO.input(17):
        return "Methane detected! (High)"
    else:
        return "Methane not detected (Low)"

while True:
    print(get_gas_concentration())
    time.sleep(1)
```
Note: In this example, we're using the digital output (DOUT) pin, which is optional and requires a separate connection on the module. The default module comes with only analog output (OUT).

Tips and Precautions

Handle the module with care to avoid damage to the sensitive gas sensor.
 Ensure proper ventilation when working with the module to avoid exposure to methane gas.
 Calibrate the module according to the manufacturer's instructions for optimal performance.
 Use the module in conjunction with other safety measures, such as alarm systems, to ensure timely response to gas leaks.

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MQ-4 Natural Gas Sensor Module For Methane(CNG) gas Detector Module