MQ-8 hydrogen gas sensor detects the alarm module, gas sensor module Arduino Sale

MQ-8 hydrogen gas sensor detects the alarm module, gas sensor module Arduino

MQ-8 hydrogen gas sensor detects the alarm module, gas sensor module Arduino

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MQ-8 hydrogen gas sensor detects the alarm module, gas sensor module Arduino


MQ-8 sensor Description:

MQ-8 gas sensor using gas-sensitive materials with lower conductivity in clean air tin oxide (SnO2). When the sensor their environment, the presence of flammable gas, the sensor's conductivity increases with the increase of the concentration of combustible gases in air. Changes in the conductivity can be converted to the corresponding output signal of the gas concentration using a simple circuit. MQ-8 high sensitivity to hydrogen gas sensor, the monitoring of the other hydrogen-containing gas is also very desirable. This sensor can detect a variety of hydrogen-containing gas, city gas, is a low-cost sensor suitable for a variety of applications.

Module applications:

Suitable for use in the household or industrial monitoring means of hydrogen leaks. Ethanol vapor, soot, carbon monoxide and other gases from interference.

Module Features:

1, using high-quality dual-panel design, with a power indicator and TTL signal output instructions;

2, with a the DO switch signal (TTL) output, and AO analog signal output;

3, TTL output valid signal is low. (When the low output signal light can be connected directly to the microcontroller or relay module)

4, 0 ~ 5V analog output voltage, the higher the concentration, the higher the voltage.

5, the hydrogen gas detection with better sensitivity.

6, there are four screw holes for easy positioning;

Product Dimensions: 32 (L) * 20 (W) * 22 (H)

8, with a long life and reliable stability

9, rapid response and recovery characteristics

10, operating voltage: 5V

Module using the instructions:

Explanation: Use Preheat 20S

The first step: to the module for 5V DC (note the positive and negative do not reverse, otherwise easily burned chip).

Step 2: If you select the output end of the high and low DO, TTL output signal can be connected directly to a microcontroller IO port or connect to the relay module, potentiometer is used to adjust the output level transition threshold.

Step Three: If you choose to AO, analog output, so you do not have control potentiometer AO feet directly connected to the input of the AD converter or microcontroller with AD can. According to our experience: In a normal environment, namely: the environment of the measured gas, setting the sensor output voltage value of the reference voltage, At this time, the voltage of the AO end about 1V, when the sensor detects that the gas to be measured when the voltage of each elevated 0.1V, the actual measured gas concentrations 200ppm (simple: 1ppm = 1mg/kg = 1mg / L = 1 × 10-6 commonly used to indicate the gas concentration, or the concentration of the solution.), on the basis of this parameter can microcontroller inside the measured analog voltage value is converted to concentration values. Note: If you are used to do a precision instrument, please buy the standard calibration instrument market, or there is an error, because the ratio of the output concentration and voltage relationship is linear, but tends to be linear.

Special note: the sensor is powered Preheat 20S stable measurement data, sensor fever is a normal phenomenon, because the internal heating wire, if hot is not normal.


Test Procedure:


Function: This version supporting test program

Using the chip: AT89S52

Crystal: 11.0592MHZ

Baud Rate: 9600

Compilation environment: Keil

Disclaimer  This program is used only for study and reference, the reference please specify copyright and author information!

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

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

Description: 1, single-chip IO output low when the measured concentration is greater than the set concentration

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

# Include / / library files

# Define uchar unsigned char / / macro definition unsigned char

Unsigned int # define uint unsigned int / / macro definition.


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

I / O definition

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sbit LED = P1 ^ 0; / / definition of SCM P1 port 1 (P1.0) to indicate the end

sbit DOUT = P2 ^ 0; / / definition microcontroller P2 port 1 (P2.0) for the sensor input of

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

Delay function

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

void delay () / / delay procedure


uchar m, n, s;

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

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

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


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

The main function

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

void main ()


while (1) / / infinite loop


LED = 1; / / extinguish the P1.0 port lights

if (DOUT == 0) / / function when the concentration is higher than the set value, the execution condition


delay () ;/ / delay anti-jamming

if (DOUT == 0) / / determine the concentration is higher than the set value, the function of the Executive conditions


LED = 0; / / lit P1.0 port lights





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


************************************************** *******************

Abbiamo disponibili datasheet di tutti i componenti, qualora non fosse presente nella scheda download del prodotto inviaci un messaggio dal modulo contattaci e lo pubblicheremo il prima possibile nel nostro sito.

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