• [Statement] This procedure is used only for study and reference, please indicate the copyright and author information!
• ************************************************** ******************* /
• / ************************************************* *******************
• Note: 1, when the measured concentration is greater than the set density, single-chip IO port output low
• ************************************************** ******************* /
• # Include // library files
• #define uchar unsigned char // macro definition unsigned char
• #define uint unsigned int // macro definition unsigned int
• / ************************************************* *******************
• I / O definitions
• ************************************************** ******************* /
• sbit LED = P1 ^ 0; // define microcontroller P1 port of the first one (ie P1.0) to indicate the end
• sbit DOUT = P2 ^ 0; // define the microcontroller P2 port first one (ie P2.0) as an input sensor
• / ************************************************* *******************
• 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; // off P1.0 port lights
• if (DOUT == 0) // When the concentration is higher than the set value, the implementation of the Con
• {
• delay (); // delay interference
• When if (DOUT == 0) // determine the concentration higher than the set value, the implementation of the Con
• {
• LED = 0; // P1.0 port lights lit
• }
• }
• }
• }
• / ************************************************* *******************
• End
• ************************************************** ****************** /

MQ-4 Product Overview:

Gas can be used in homes and factories leakage monitoring device, suitable for the detection of liquefied petroleum gas, butane, propane, methane, smoke and the like

MQ-5
Product Overview:

Size: 32X22X27mm/

Main Chip: LM393, ZYMQ-5 gas sensor

Operating Voltage: DC 5V

Input Voltage: DC5V

Power: 150mA

DO Output: 0.1V/5V

AO Output: 0.1-0.3A

Features:

Indication of the signal output

Dual signal output (analog output, and TTL level output)

TTL output signal is low. (When low output signal light, and can be connected directly to the microcontroller)

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

Liquefied petroleum gas, natural gas, city gas, better sensitivity

Has a long life and reliable stability

Fast response and recovery characteristics

Applications :

Liquefied petroleum gas, natural gas, coal gas monitoring device suitable for home or industrial. Excellent resistance to alcohol, smoke interference ability

MQ-6
Product Overview:

Sensitive material MQ-6 gas sensors used in clean air, low conductivity tin oxide (SnO2). When there is an environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases. Use simple circuit can convert the change in conductivity of the gas concentration corresponding to the output signal. MQ-6 gas sensor for propane, butane, LPG high sensitivity, natural gas and has a good sensitivity. The sensor can detect a variety of combustible gas, it is a low-cost sensor suitable for a variety of applications.

Application:

Suitable for home or industrial on LPG (liquefied petroleum gas), butane, propane, LNG (liquefied natural gas) detection devices. Excellent resistance to ethanol vapor, mist interference.

MQ-7 Product Overview:

Sensitive material MQ-7 gas sensors used in clean air, low conductivity tin oxide (SnO2). High-low temperature cycling detection mode (1.5V heating) carbon monoxide detector, conductivity sensor with the increasing concentration of carbon monoxide gas in the air increases,high-temperature (5.0V heating) cleaning cryoadsorption stray gases. Using a simple circuit to change the conductivity, concentration of the gas is converted to the corresponding output signal. MQ-7 gas sensor of high sensitivity for carbon monoxide, this sensor can detect a variety of gases containing carbon monoxide, is a low-cost sensors for a variety of applications

Application:

Can be used for home and factory gas leakage monitoring devices, suitable for liquefied petroleum gas, butane, propane, methane, smoke, etc.

MQ-8
Product Overview:

Sensitive material MQ-8 gas sensors used in clean air, low conductivity tin oxide (SnO2). When there is an environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases. Use simple circuit can convert the change in conductivity of the gas concentration corresponding to the output signal. MQ-8 hydrogen gas sensor of high sensitivity monitoring of other hydrogen-containing gas is also very good. The sensor can detect a variety of hydrogen-containing gas, in particular, city gas, is a low-cost sensor suitable for a variety of applications.

Application:

Suitable for home or industrial hydrogen leak monitoring devices. Can not interfere with ethanol vapor, soot, carbon monoxide and other gases.

MQ-9
Product Overview:

Sensitive material MQ-9 gas sensors used in clean air, low conductivity tin oxide (SnO2). High-low temperature cycling detection mode (1.5V heating) detecting carbon monoxide sensor’s conductivity increases with the air of carbon monoxide gas concentration increases, spurious adsorption at high temperature (5.0V heat) detection of combustible gases methane, propane, and cryogenic cleaning gas. Using a simple circuit to change the conductivity, concentration of the gas is converted to the corresponding output signal. MQ-9 gas sensor for high carbon monoxide, methane, liquefied petroleum gas sensitivity, this sensor can detect a variety of carbon monoxide and combustible gas, is a low-cost sensor suitable for a variety of applications.

Application:

Suitable for home or industrial hydrogen leak monitoring devices. Can not interfere with ethanol vapor, soot, carbon monoxide and other gases.