Difference between revisions of "Matrix - MQ-2 Gas Sensor"

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==Introduction==
 
==Introduction==
−
[[File:MQ-2 Gas Sensor_1.jpg|thumb|MQ-2 烟雾传感器]]
+
[[File:MQ-2 Gas Sensor_1.jpg|thumb|MQ-2 Gas Sensor]]
−
* 模块Matrix-MQ-2_Gas_Sensor使用MQ-2气体传感器，该传感器对液化气、丙烷、氢气的灵敏度高，对天然气和其它可燃蒸汽的检测也很理想，可以用来检测多种气体的泄露，是一款适合多种应用的低成本传感器。
+
* The Matrix-MQ-2_Gas_Sensor uses the MQ-2 gas sensor which is sensitive to LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke and etc and is used to detect multiple gas leakage. This makes it suitable in various applications of gas leak detection.
−
*模块的输出电压与气体浓度成比例。
+
* The output voltage of the module is positively proportional to the gas concentration.
  
−
==特性==
+
==Features==
−
* 使用标准的3 PIN接口
+
* Standard 3 Pin Interface
−
* 尺寸为 24x32mm
+
* PCB Dimension(mm): 24 x 32
−
* PCB尺寸（mm）：24x32
+
 
[[File:MQ-2 Gas Sensor.png | frameless|350px|MQ-2 Gas Sensor.PCB]]
 
[[File:MQ-2 Gas Sensor.png | frameless|350px|MQ-2 Gas Sensor.PCB]]
  
−
* 引脚说明:
+
* Pin Description:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
|名称 || 描述
+
|Pin || Description
 
|-
 
|-
 
|S    || GPIO
 
|S    || GPIO
 
|-
 
|-
−
|V    || 电源5V
+
|V    || Supply Voltage 5V
 
|-
 
|-
−
|G    || 地
+
|G    || Ground
 
|}
 
|}
  
−
==工作原理==
+
==Basic Device Operation==
−
* MQ-2_Gas_Sensor模块的主要器件是一个具有快速响应和恢复特性的MQ-2气体传感器，传感器所使用的气敏材料是在清洁空气中电导率较低的二氧化锡(SnO2)，当传感器所处环境中存在可燃气体时，
+
* The MQ-2_Gas_Sensor module mainly consists of a MQ-2 gas sensor which is stable and responsive. The sensor uses SnO2 as its gas sensitive material. When its surrounding environment has combustible gases its conductivity change is positively proportional to the gas concentration and this change will be converted to analog output signals. Its sensitivity can be adjusted via the potentiometer.
−
传感器的电导率随空气中可燃气体浓度的增加而增大，传感器将电导率的变化转换为与该气体浓度相对应的模拟信号输出，灵敏度可以通过电位计进行调节。
+
  
−
==下载Matrix源码==
+
==Applications==
 +
The Matrix-MQ_2_Gas_Sensor module outputs analog signals which can be converted to digital signals through an ADC converter e.g. the Matrix-Analog_to_Digital_Converter module.<br>
 +
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki: [[Matrix_-_Analog_to_Digital_Converter]].<br>
 +
 
 +
===Connect to NanoPi M1===
 +
Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 +
[[File:Matrix-MQ_2_Gas_Sensor_nanopi_m1.jpg|frameless|600px|Matrix-MQ-2_Gas_Sensor_nanopi_m1]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-MQ_2_Gas_Sensor ||     
 +
|-
 +
|GND    || NanoPi M1 Pin9
 +
|-
 +
|5V    || NanoPi M1 Pin2
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
===Connect to NanoPi 2===
 +
Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 +
[[File:Matrix-MQ2.jpg|frameless|600px|Matrix-MQ2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-MQ_2_Gas_Sensor ||     
 +
|-
 +
|GND    || NanoPi 2 Pin9
 +
|-
 +
|5V    || NanoPi 2 Pin2
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
===Connect to NanoPi M2 / NanoPi 2 Fire===
 +
Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:<br>
 +
[[File:Matrix-MQ_2_Gas_Sensor_nanopi_m2.jpg|frameless|600px|Matrix-MQ-2_Gas_Sensor_nanopi_m2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-MQ-2_Gas_Sensor ||     
 +
|-
 +
|GND    || NanoPi M2 Pin9
 +
|-
 +
|5V    || NanoPi M2 Pin2
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
===Connect to NanoPC-T2===
 +
Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 +
[[File:Matrix-MQ-2_Gas_Sensor_NanoPC-T2.jpg|frameless|600px|Matrix-MQ-2_Gas_Sensor_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-MQ-2_Gas_Sensor ||     
 +
|-
 +
|GND    || NanoPC-T2 USB Host GND
 +
|-
 +
|5V    || NanoPC-T2 USB Host 5V
 +
|-
 +
|S      || Matrix-Analog_to_Digital_Converter A0
 +
|}
 +
 
 +
==Compile & Run Test Program==
 +
Boot your ARM board with Debian and copy the matrix code:
 +
<syntaxhighlight lang="bash">
 +
$ apt-get update && apt-get install git
 +
$ git clone https://github.com/friendlyarm/matrix.git
 +
</syntaxhighlight>
 +
If your cloning is done successfully a "matrix" directory will be generated.
 +
 
 +
Compile and install Matrix:
 +
<syntaxhighlight lang="bash">
 +
$ cd matrix
 +
$ make && make install
 +
</syntaxhighlight>
 +
 
 +
Run test program:
 +
<syntaxhighlight lang="bash">
 +
$ matrix-adc
 +
</syntaxhighlight>
 +
Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.<br>
 +
Here is what you should observe:<br>
 +
<syntaxhighlight lang="bash">
 +
The channel0 value is 2460
 +
</syntaxhighlight>
 +
When there is leakage of gases e.g. LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke and etc an event will be triggered and detected.The more the concentration of gases is the more the value will be.
 +
 
 +
==Code Sample==
 +
This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-analog_to_digital_converter". Here is its source code:
 +
<syntaxhighlight lang="c">
 +
int main(int argc, char ** argv)
 +
{
 +
    int i = 0;
 +
    int value = 0;
 +
    int channel = 0;
 +
 
 +
    if (boardInit() < 0) {
 +
        printf("Fail to init board\n");
 +
        return -1;
 +
    }
 +
   
 +
    if (argc == 2)
 +
        channel = atoi(argv[1]);
 +
    system("modprobe "DRIVER_MODULE);
 +
    signal(SIGINT, intHandler);
 +
    for (i=0; i<ADC_READ_TIMES; i++) {
 +
        if (pcf8591Read(channel, &value) != -1) {
 +
            printf("The channel%d value is %d\n", channel, value);
 +
        } else {
 +
            printf("Fail to get channel%d value\n", channel);
 +
        }
 +
    }
 +
    system("rmmod "DRIVER_MODULE);
 +
   
 +
    return 0;
 +
}
 +
</syntaxhighlight>
 +
For more details about this APIs called in this code sample refer to [[Matrix API reference manual]] <br>
 +
 
 +
==Resources==
 +
<!---
 +
==Download Matrix Source Code==
 +
--->
 +
 
 +
==Update Log==
 +
===Feb-24-2016===
 +
* Added Sections 1, 2, 3 and 4
 +
===June-21-2016===
 +
* Re-organized and simplified wiki

Latest revision as of 16:03, 21 June 2016

查看中文

1 Introduction

MQ-2 Gas Sensor
  • The Matrix-MQ-2_Gas_Sensor uses the MQ-2 gas sensor which is sensitive to LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke and etc and is used to detect multiple gas leakage. This makes it suitable in various applications of gas leak detection.
  • The output voltage of the module is positively proportional to the gas concentration.

2 Features

  • Standard 3 Pin Interface
  • PCB Dimension(mm): 24 x 32

MQ-2 Gas Sensor.PCB

  • Pin Description:
Pin Description
S GPIO
V Supply Voltage 5V
G Ground

3 Basic Device Operation

  • The MQ-2_Gas_Sensor module mainly consists of a MQ-2 gas sensor which is stable and responsive. The sensor uses SnO2 as its gas sensitive material. When its surrounding environment has combustible gases its conductivity change is positively proportional to the gas concentration and this change will be converted to analog output signals. Its sensitivity can be adjusted via the potentiometer.

4 Applications

The Matrix-MQ_2_Gas_Sensor module outputs analog signals which can be converted to digital signals through an ADC converter e.g. the Matrix-Analog_to_Digital_Converter module.
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki: Matrix_-_Analog_to_Digital_Converter.

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-MQ-2_Gas_Sensor_nanopi_m1

Connection Details:

Matrix-MQ_2_Gas_Sensor
GND NanoPi M1 Pin9
5V NanoPi M1 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-MQ2

Connection Details:

Matrix-MQ_2_Gas_Sensor
GND NanoPi 2 Pin9
5V NanoPi 2 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.3 Connect to NanoPi M2 / NanoPi 2 Fire

Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:
Matrix-MQ-2_Gas_Sensor_nanopi_m2

Connection Details:

Matrix-MQ-2_Gas_Sensor
GND NanoPi M2 Pin9
5V NanoPi M2 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.4 Connect to NanoPC-T2

Refer to the following connection diagram to connect the module to the NanoPC-T2:
Matrix-MQ-2_Gas_Sensor_NanoPC-T2

Connection Details:

Matrix-MQ-2_Gas_Sensor
GND NanoPC-T2 USB Host GND
5V NanoPC-T2 USB Host 5V
S Matrix-Analog_to_Digital_Converter A0

5 Compile & Run Test Program

Boot your ARM board with Debian and copy the matrix code: 

$ apt-get update && apt-get install git
$ git clone https://github.com/friendlyarm/matrix.git

If your cloning is done successfully a "matrix" directory will be generated.

Compile and install Matrix: 

$ cd matrix
$ make && make install

Run test program: 

$ matrix-adc

Note: this module is not plug and play therefore before running the module please make sure it is connected to an ARM board.
Here is what you should observe:

The channel0 value is 2460

When there is leakage of gases e.g. LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke and etc an event will be triggered and detected.The more the concentration of gases is the more the value will be.

6 Code Sample

This Matrix code sample can work with all the ARM boards mentioned in this module's wiki. The name of this code sample is "matrix-analog_to_digital_converter". Here is its source code: 

int main(int argc, char ** argv)
{
    int i = 0;
    int value = 0;
    int channel = 0;
 
    if (boardInit() < 0) {
        printf("Fail to init board\n");
        return -1;
    }
 
    if (argc == 2)
        channel = atoi(argv[1]);
    system("modprobe "DRIVER_MODULE);
    signal(SIGINT, intHandler);
    for (i=0; i<ADC_READ_TIMES; i++) {
        if (pcf8591Read(channel, &value) != -1) {
            printf("The channel%d value is %d\n", channel, value);
        } else {
            printf("Fail to get channel%d value\n", channel);
        }
    }
    system("rmmod "DRIVER_MODULE);
 
    return 0;
}

For more details about this APIs called in this code sample refer to Matrix API reference manual

7 Resources

8 Update Log

8.1 Feb-24-2016

  • Added Sections 1, 2, 3 and 4

8.2 June-21-2016

  • Re-organized and simplified wiki
Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=Matrix_-_MQ-2_Gas_Sensor&oldid=6176"