915 Generation 2x MQ-9 Combustible Gas Sensor Module for Gas Leak

Detailed Information About The Product:

Circuit Voltage: 5 V +/- 0.1;Heating Resistance: 33 Ω +/- 5%
Heating Consumption: Less than 340 mw;Standard Working Temperature: -20 Celsius +/- 2 Celsius
MQ-9 is a highly sensitive gas sensor to methane, propane and carbon monoxide.
It has low cost, long life, simple drive circuit and suitable for different applications.
This sensor is very useful for gas leakage detection;It can detect different gases that contain carbon monoxide and combustible gases with the use of sensitive material SnO2. The use of a simple circuit can change the conductivity of the gas concentration corresponding to the output signal.
The MQ-9 gas sensor is highly sensitive to carbon monoxide, methane and liquefied gas.
This sensor detects a wide range of carbon monoxide and flammable gases and is a low cost sensor for a wide range of applications.
Module Features:
The use of high-quality dual-panel design, with power indicator and TTL signal output instructions;
With DO switch signal (TTL) output and AO analog signal output;
TTL output valid signal is low. (When the output low signal lights, can be directly connected to the microcontroller or relay module)
The analog output voltage with the higher the higher the voltage the higher the voltage.
The liquefied petroleum gas, natural gas, city gas, smoke has a better sensitivity.
There are four screw holes to facilitate positioning;
Special reminder: the sensor power, the need to preheat 20S or so, the measured data was stable, the sensor fever is a normal phenomenon, because the internal electric wire, if the hot is not normal.
Wiring:
VCC: then the power supply positive (5V)
GND: Connect the power supply negative
DO: TTL switch signal output
AO: analog signal output
test program:
Implementation of the function: This version of supporting test procedures
Use the chip: AT89S52
Crystal: 11.0592MHZ
Baud rate: 9600
Material:Metal
Size: 32 x 20 x 22mm
Colour:Blue
Quantity: 2 pcs
Package Contents: 2 x Combustible Gas Sensor Module
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.

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