MQ-5 Liquefied Gas (LPG) Gas Sensor

  The MQ-5 gas sensor uses tin oxide (SnO2) as its sensing material, which has low conductivity in clean air. When combustible gases are present in the environment, the conductivity of the sensor increases in proportion to the concentration of these gases. A simple circuit can convert this change in conductivity into an output signal corresponding to the gas concentration. The MQ-5 sensor is highly sensitive to gases like butane, propane, and methane, making it effective for detecting a wide range of combustible gases, especially natural gas. It is a low-cost sensor suitable for various applications.

Module Source

Purchase Link:
https://detail.tmall.com/item.htm?abbucket=0&id=16501254145&ns=1&spm=a21n57.1.0.0.5668523c1NVcMb
Baidu Netdisk Download Link: https://pan.baidu.com/s/1B8WhPIzTmWwQsFFVayRpAA?pwd=9966
Password: 9966

Specifications

Operating Voltage: 3.3V-5V
Operating Current: 150MA
Output Methods:
DO (Digital Output) AO (Analog Output)
Reading Method: ADC (Analog-to-Digital Converter)
Pin Count: 4 Pins (2.54mm pitch header)

Hardware Connection

• Connect the Vcc pin of the sensor to the 5V power supply of the development board.
• Connect the GND pin of the sensor to the GND of the development board.
• Connect the AO (Analog Output) pin to the A0 analog input pin of the development board.
• Connect the DO (Digital Output) pin to the digital pin 8 of the development board.

Usage Method

/******************************************************************************
  * Test Hardware: LCSC ColorEasyDuino Development Board
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  * Modification Date: April 8, 2024
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int MQ5_AO_Pin = A0; // 定义可燃气体传感器的AO连接到开发板的A0引脚
int MQ5_DO_Pin = 8;  // 定义可燃气体传感器的DO连接到开发板的8号引脚
int MQ5Value = 0; // 用于存储可燃气体浓度值的变量
#define ADC_MAX_VALUE 1023  //ADC的最大采集值

void setup() {
  Serial.begin(9600); // 开始串行通讯，设置波特率为9600
  pinMode(MQ5_DO_Pin, INPUT_PULLUP);
}

void loop() {
  // 读取状态
  int MQ5State = digitalRead(MQ5_DO_Pin);
  if (MQ5State == LOW) {
    Serial.println("检测到可燃气体");
  } else {
    Serial.println("未检测到可燃气体");
  }

  MQ5Value = analogRead(MQ5_AO_Pin); // 读取A0引脚的电压值
  Serial.print("可燃气体浓度: ");
  Serial.println( MQ5Value); // 将读取的值发送到电脑的串行监视器
  delay(1000); // 延时1秒
}

Usage Testing