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Brief Introduction

The gas sensing material used in MQ-8 gas sensors is tin dioxide (SnO2) with low conductivity in clean air. When there is combustible gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of combustible gas concentration in the air. The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit. The MQ-8 gas sensor has high sensitivity to hydrogen gas and is also ideal for monitoring other hydrogen containing gases. This sensor can detect various hydrogen containing gases, especially urban gas, and is a low-cost sensor suitable for multiple applications.

Module application

Suitable for monitoring hydrogen gas leaks in households or industries. It is not affected by gases such as ethanol vapor, oil fumes, carbon monoxide, etc.

Module features

1. Adopting high-quality dual panel design, with power indication and TTL signal output indication;

2. Equipped with DO switch signal (TTL) output and AO analog signal 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 or relay module

4. The voltage of analog output increases with higher concentration.

5. Has good sensitivity for hydrogen detection.

6. There are four screw holes for easy positioning;

7. Product dimensions: 32 (L) * 20 (W) * 22 (H)

8. Long term service life and reliable stability

9. Quick response and recovery features

Electrical performance

Input voltage: DC5V Power consumption (current): 150mA

DO output: TTL digital quantities 0 and 1 (0.1 and 5V)

AO output: 0.1-0.3V (relatively pollution-free), concentration voltage around 4V

Special reminder: After the sensor is powered on, it needs to be preheated for about 20 seconds for the measured data to stabilize. Sensor heating is a normal phenomenon because there are electric heating wires inside. If it is hot, it is not normal.

Test program

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//library files

#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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