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南工高瞻\_資料傳輸課程
============

一、元件介紹

感測：一氧化碳，可燃氣體

![](http://maker.tn.edu.tw/uploads/tad_book3/image/MQ-9.jpg)

<table border="1" cellpadding="5" cellspacing="0" width="100%"> <tbody> <tr valign="TOP"> <td bgcolor="#c0c0c0" width="50%">Arduino UNO</td> <td bgcolor="#c0c0c0" width="50%">MQ-9 元件</td> </tr> <tr valign="TOP"> <td width="50%">A0</td> <td width="50%">A0</td> </tr> <tr valign="TOP"> <td width="50%">不接</td> <td width="50%">D0</td> </tr> <tr valign="TOP"> <td width="50%">GND</td> <td width="50%">GND</td> </tr> <tr valign="TOP"> <td width="50%">5V</td> <td width="50%">VCC</td> </tr> </tbody> </table>

二、接線範例

![](http://maker.tn.edu.tw/uploads/tad_book3/image/uno-mq2-bb.png)

三、程式範例

Arduino程式參考：[http://wiki.seeed.cc/Grove-Gas\_Sensor-MQ9/](http://wiki.seeed.cc/Grove-Gas_Sensor-MQ9/)

基礎

```

void setup() {
    Serial.begin(9600);
}

void loop() {
    float sensor_volt;
    float sensorValue;

sensorValue = analogRead(A0);
    sensor_volt = sensorValue/1024*5.0;

Serial.print("sensor_volt = ");
    Serial.print(sensor_volt);
    Serial.println("V");
    delay(1000);
}
```

測量近似值

1. Keep the Gas Sensor in clean air environment. Upload the program below. ```
    
    void setup() {
        Serial.begin(9600);
    }
    
    void loop() {
        float sensor_volt;
        float RS_air; //  Get the value of RS via in a clear air
        float R0;  // Get the value of R0 via in LPG
        float sensorValue;
    
        /*--- Get a average data by testing 100 times ---*/
        for(int x = 0 ; x < 100 ; x++)
        {
            sensorValue = sensorValue + analogRead(A0);
        }
        sensorValue = sensorValue/100.0;
        /*-----------------------------------------------*/
    
        sensor_volt = sensorValue/1024*5.0;
        RS_air = (5.0-sensor_volt)/sensor_volt; // omit *RL
        R0 = RS_air/9.9; // The ratio of RS/R0 is 9.9 in LPG gas from Graph (Found using WebPlotDigitizer)
    
        Serial.print("sensor_volt = ");
        Serial.print(sensor_volt);
        Serial.println("V");
    
        Serial.print("R0 = ");
        Serial.println(R0);
        delay(1000);
    
    }
    ```
2. <font color="Red">Replace the R0 below with value of R0 tested above </font>. Expose the sensor to any one of the gas listed above. ```
    
    void setup() {
        Serial.begin(9600);
    }
    
    void loop() {
    
        float sensor_volt;
        float RS_gas; // Get value of RS in a GAS
        float ratio; // Get ratio RS_GAS/RS_air
        int sensorValue = analogRead(A0);
        sensor_volt=(float)sensorValue/1024*5.0;
        RS_gas = (5.0-sensor_volt)/sensor_volt; // omit *RL
    
              /*-Replace the name "R0" with the value of R0 in the demo of First Test -*/
        ratio = RS_gas/R0;  // ratio = RS/R0
              /*-----------------------------------------------------------------------*/
    
        Serial.print("sensor_volt = ");
        Serial.println(sensor_volt);
        Serial.print("RS_ratio = ");
        Serial.println(RS_gas);
        Serial.print("Rs/R0 = ");
        Serial.println(ratio);
    
        Serial.print("\n\n");
    
        delay(1000);
    
    }
    ```
 
其他程式參考：[https://www.elecrow.com/wiki/index.php?title=Analog\_CO/Combustible\_Gas\_Sensor(MQ9)](https://www.elecrow.com/wiki/index.php?title=Analog_CO/Combustible_Gas_Sensor(MQ9))

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