Difference between revisions of "Matrix - MQ-3 Gas Sensor"

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[[Matrix - MQ-3 Gas Sensor/zh|English]]
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[[Matrix - MQ-3 Gas Sensor/zh|查看中文]]
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==介绍==
+
−
[[File:MQ-3 Gas Sensor_1.jpg|thumb|MQ-3 酒精传感器]]
+
−
* 模块Matrix-MQ-3_Gas_Sensor使用MQ-3气体传感器，该传感器对酒精蒸汽的灵敏度高，可以用来检测酒精蒸汽的浓度。
+
−
*模块的输出电压与气体浓度成比例。
+
−
*为提高测试准确性，测试前让传感器先预热一分钟。传感器发热属于正常现象，因为内部有电热丝，如果烫手就不正常了。
+
  
−
==特性==
+
==Introduction==
−
* 使用标准的3 PIN接口
+
[[File:MQ-2 Gas Sensor_1.jpg|thumb|MQ-3 Alcohol sensor]]
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* 尺寸为 24x32mm
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* The Matrix-MQ_3_Gas_Sensor module uses the MQ-3 gas sensor which is sensitive to alcoholic vapors and thus can be used to detect the density of an alcoholic vapor.
−
* PCB尺寸（mm）：24x32
+
* The output voltage of the module is non-linear but close to linear to the concentration of alcoholic vapors.
−
[[File:MQ-2 Gas Sensor.png | frameless|350px|MQ-3 Gas Sensor.PCB]]
+
* In order to increase its accuracy before use it to detect a gas warm it up for one minute as long as it is not overheated.
  
−
* 引脚说明:
+
==Features==
 +
* Standard 3 PIN header
 +
* PCB dimension(mm): 24 x 32
 +
[[File:MQ-3 Gas Sensor.png | frameless|350px|MQ-3 Gas Sensor.PCB]]
 +
 
 +
* Pin Description:
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
|名称 || 描述
+
|Pin || Description
 
|-
 
|-
 
|S    || GPIO
 
|S    || GPIO
 
|-
 
|-
−
|V    || 电源5V
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|V    || Supply Voltage 5V
 
|-
 
|-
−
|G    || 地
+
|G    || Ground
 
|}
 
|}
  
−
==工作原理==
+
==Basic Device Operation==
−
* MQ-3_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-3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酒精蒸汽时，传感器的电导率随空气中酒精蒸汽的浓度增加而增大，传感器将电导率的变化转换为与酒精蒸汽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。
+
The Matrix-MQ_3_Gas_Sensor module employs a responsive MQ-3 gas sensor. Its gas sensitive material is SnO2. When the alcohol concentration in the air increases the sensor conductivity will increase accordingly and the module will convert the change of conductivity to analog signals. The sensitivity can be adjusted by the potentiometer.
 +
 
 +
==Applications==
 +
The Matrix-MQ_3_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_3_Gas_Sensor_nanopi_m1.jpg|frameless|600px|Matrix-MQ_3_Gas_Sensor_nanopi_m1]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-MQ_3_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-MQ_3_Gas_Sensor_nanopi_2.jpg|frameless|600px|Matrix-MQ_3_Gas_Sensor_nanopi_2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-MQ_3_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_3_Gas_Sensor_nanopi_m2.jpg|frameless|600px|Matrix-MQ_3_Gas_Sensor_nanopi_m2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-MQ_3_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_3_Gas_Sensor_NanoPC-T2.jpg|frameless|600px|Matrix-MQ_3_Gas_Sensor_NanoPC-T2]]
 +
 
 +
Connection Details:
 +
{| class="wikitable"
 +
|-
 +
|Matrix-Potentiometer ||     
 +
|-
 +
|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 the concentration of alcoholic vapors reaches a threshold value an event will be triggered. As the concentration increases the value will increase.
 +
 
 +
==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==
  
−
==下载Matrix源码==
+
==Update Log==
 +
===June-21-2016===
 +
* Created English wiki

Latest revision as of 16:05, 21 June 2016

查看中文

1 Introduction

MQ-3 Alcohol sensor
  • The Matrix-MQ_3_Gas_Sensor module uses the MQ-3 gas sensor which is sensitive to alcoholic vapors and thus can be used to detect the density of an alcoholic vapor.
  • The output voltage of the module is non-linear but close to linear to the concentration of alcoholic vapors.
  • In order to increase its accuracy before use it to detect a gas warm it up for one minute as long as it is not overheated.

2 Features

  • Standard 3 PIN header
  • PCB dimension(mm): 24 x 32

MQ-3 Gas Sensor.PCB

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

3 Basic Device Operation

The Matrix-MQ_3_Gas_Sensor module employs a responsive MQ-3 gas sensor. Its gas sensitive material is SnO2. When the alcohol concentration in the air increases the sensor conductivity will increase accordingly and the module will convert the change of conductivity to analog signals. The sensitivity can be adjusted by the potentiometer.

4 Applications

The Matrix-MQ_3_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_3_Gas_Sensor_nanopi_m1

Connection Details:

Matrix-MQ_3_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-MQ_3_Gas_Sensor_nanopi_2

Connection Details:

Matrix-MQ_3_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_3_Gas_Sensor_nanopi_m2

Connection Details:

Matrix-MQ_3_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_3_Gas_Sensor_NanoPC-T2

Connection Details:

Matrix-Potentiometer
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 the concentration of alcoholic vapors reaches a threshold value an event will be triggered. As the concentration increases the value will increase.

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 June-21-2016

  • Created English wiki
Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=Matrix_-_MQ-3_Gas_Sensor&oldid=6178"