TZT MQ-7 module Carbon monoxide gas sensor detection alarm MQ7 sensor module for arduino

Published: 11.05.2024 10:29 In stock: 179272 1.32K Views

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Description

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.

Features:

Using high-quality dual-panel design,with power indicator and TTL signal output instructions.
The switching signal having a DO (TTL) output and analog output AO.
TTL output valid signal is low. ( Low-level signal when the output light can be directly connected to the microcontroller or relay module )
Analog output voltage with the higher concentration of higher voltage
There are four screw holes for easy positioning.
Has a long life and reliable stability
Rapid response and recovery characteristic

Input voltage : DC5V Power consumption ( current ): 150mA
DO output : TTL digital 0 and 1 ( 0.1 and 5V)
AO output :0.1-0 .3 V ( relative to pollution ),the maximum concentration of a voltage of about 4V
Special note: After the sensor is powered,needs to warm up around 20S,measured data was stable,heat sensor is a normal phenomenon,because the internal heating wire,if hot is not normal .

Wiring:

VCC: positive power supply (5V)
GND: power supply is negative
DO: TTL switching signal output
AO: analog signal output
NOTE:
After the sensor is powered, need to warm about 20S, measured data becomes stable, heat sensor is normal

Size:
Test program:

Function: This version of the test program supporting
Use chip: AT89S52
Crystal: 11.0592MHZ
Baud rate: 9600
Compiler Environment: Keil
[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
#define uchar unsigned char
#define uint 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 ()
{
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)
{
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 ();
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
************************************************** ******************