SEN0129 Datasheet SEN0129 | P1-P3

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AnalogGasSensor(MQ4)(SKU:SEN0129)

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Contents

 1 Introduction

1.1 Specification

 2 Pin Definition

 3 Potentiometer

3.1 Connection Diagram

3.2 Sample Code

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

 Power supply needs: 5V

 Interface type: Analog

 Pin Definition: 1-Output 2-GND 3-VCC

 High sensitivity to CH4£¬Natural gas

 Small sensitivity to alcohol, smoke

 Fast response

 Stable and long life

 Simple drive circuit

 Size: 40x20mm

PinDefinition

1. Signal Output

2. GND

3. Power

Analog Sensor Pin Definition

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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);

P1-P3

SEN0129

Mfr. #:

Buy SEN0129

Manufacturer:

DFRobot

Description:

Multiple Function Sensor Development Tools Analog Gas Sensor MQ4

Lifecycle:

New from this manufacturer.

Delivery:

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