Introduction

The MQ4 is used in gas leakage detecting equipment in consumer and industry markets,this sensor is suitable for detecting CH4,Natural gas, LNG, avoid exposure to alcohol, cooking fumes, and cigarette smoke. The sensitivity can be adjusted by the potentiometer.

Specification

Pin Definition

  1. Signal Output
  2. Power
  3. GND

Analog Sensor Pin Definition

Potentiometer

Potentiometer is used to calibrate the readings from this sensor as stated on the datasheet:

SENSITVITY ADJUSTMENT

Resistance value of MQ-4 is difference to various kinds and various concentration gases. So,When using this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for 5000ppm of CH4 concentration in air and use value of Load resistance ( RL) about 20KΩ(10KΩ to 47KΩ). When accurately measuring, the proper alarm point for the gas detector should be determined after considering the temperature and humidity influence.

Connection Diagram

Analog sensor connection diagram

Sample Code


///Arduino Sample Code
void setup()
{
  Serial.begin(9600); //Set serial baud rate to 9600 bps
}
void loop()
{
int val;
val=analogRead(0);Read Gas value from analog 0
Serial.println(val,DEC);//Print the value to serial port
delay(100);
}

More Documents

DFshopping_car1.png Get 3 Analog Gas Sensor(MQ4) from DFRobot Store or DFRobot Distributor.

Category: DFRobot > Sensors & Modules > Sensors > Air Sensors

category: Product Manual category: DFR Series category: Sensors category:source category:Diagram

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