Brief Introduction

Using MQ series gas sensor probes, stable performance

Has good recognition of methane gas

Adjustable sensitivity and stable performance

Fast response speed, fast recovery speed

Working voltage 5V, digital (TTL level) analog dual output.

Port description: DO is a digital output, AO is an analog output.

Equipped with fixed bolt holes for easy installation

Brief description

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1、 Size: 32mm X22mm X27mm Length X Width X Height

2、 Main chips: LM393, ZYMQ-4 gas sensor

3、 Working voltage: 5 volts DC

Characteristics

1. Has signal output indication.

2. Dual signal output (analog output and TTL level output)

3. TTL outputs a valid signal at a low level. When the signal light is on when the output is low, it can be directly connected to a microcontroller

4. Analog output voltage of 0-5V, the higher the concentration, the higher the voltage.

5. Highly sensitive to methane and natural gas

6. Long term service life and reliable stability

7. Quick response and recovery features

Application

Detection devices for methane and natural gas used in households and industries

[Test Program]

Implementation function:

1. When the measured concentration is greater than the set concentration, the microcontroller IO port outputs a low level

/********************************************************************

Implementation function: This version comes with a supporting testing program

Using chip: AT89S52

Crystal oscillator: 11.0592MHz

Baud rate: 9600

Compilation environment: Keil

[Disclaimer] This program is for learning and reference only. Please indicate copyright and author information when citing!

*********************************************************************/

/********************************************************************

Explanation: When the measured concentration is greater than the set concentration, the IO port of the microcontroller outputs a low level

*********************************************************************/

#Include<reg52. h>//Library file

#Define uchar unsigned char//macro to define unsigned character type

#Define uint unsigned int//Macro defines unsigned integer

/********************************************************************

I/O Definition

*********************************************************************/

sbit LED=P1^0; // Define the P1 port of the microcontroller (i.e. P1.0) as the indicator terminal

sbit DOUT=P2^0; // Define the P2 port of the microcontroller (i.e. P2.0) as the input terminal of the sensor

/********************************************************************

Delay Functions

*********************************************************************/

Void delay()//Delay program

{

uchar m,n,s;

for(m=20;m>0;m--)

for(n=20;n>0;n--)

for(s=248;s>0;s--);

}

/********************************************************************

Main function

*********************************************************************/

void main()

{

While (1)//infinite loop

{

LED=1; // Turn off the P1.0 port light

If (DOUT==0)//When the concentration is higher than the set value, execute the conditional function

{

delay();// Delay anti-interference

If (DOUT==0)//When the concentration is higher than the set value, execute the conditional function

{

LED=0; // Turn on the P1.0 port light

}

}

}

}

/********************************************************************

end

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