MQ-8 Hydrogen Gas Sensor

  The MQ-8 gas sensor uses tin oxide (SnO2) as its sensitive material, which has low conductivity in clean air. When hydrogen gas is present in the environment, the sensor’s conductivity increases in proportion to the concentration of hydrogen gas in the air. This change in conductivity is converted into an output signal corresponding to the gas concentration. The MQ-8 sensor is highly sensitive to hydrogen gas and effectively suppresses interference from other gases. It can detect various hydrogen-containing gases, particularly city gas, making it a versatile and low-cost sensor suitable for a range of applications, such as safety monitoring in industrial and residential settings.

Module Source

Purchase Link: https://item.taobao.com/item.htm?spm=a21n57.1.0.0.5668523c1NVcMb&id=36125146305&ns=1&abbucket=0
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
  * Version Number: V1.0
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  * Modification Date: April 8, 2024
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int MQ8_AO_Pin = A0; // 定义氢气传感器的AO连接到开发板的A0引脚
int MQ8_DO_Pin = 8;  // 定义氢气传感器的DO连接到开发板的8号引脚
int MQ8Value = 0; // 用于存储氢气浓度值的变量
#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(MQ8_DO_Pin, INPUT_PULLUP);
}

void loop() {
  // 读取状态
  int MQ8State = digitalRead(MQ8_DO_Pin);
  if (MQ8State == LOW) {
    Serial.println("检测到氢气过高");
  } else {
    Serial.println("未检测到氢气过高");
  }

  MQ8Value = analogRead(MQ8_AO_Pin); // 读取A0引脚的电压值
  Serial.print("氢气浓度: ");
  Serial.println( MQ8Value); // 将读取的值发送到电脑的串行监视器
  delay(1000); // 延时1秒
}

Usage Testing