arduino ibox项目实战39－IfStatementConditional实验

armeasy

硬件平台：PC机一台，ibox卡片电脑一只，arduino扩展板一个，LED灯一个，电位器一个

软件平台：WIN7操作系统，android4.0或android4.4系统

实验目标：通过电位器控制LED灯的亮与灭

打开arduino的IDE开发工具，依次点击文件->示例-> 05.Control->IfStatementConditional，IfStatementConditional的示例程序将会被打开，其源码如下：

1. // These constants won't change:
   
2. const int analogPin = A0;    // pin that the sensor is attached to
   
3. const int ledPin = IO0;       // pin that the LED is attached to
   
4. const int threshold = 1000;   // an arbitrary threshold level that's in the range of the analog input
   
5. 
   
6. void setup() {
   
7.   // initialize the LED pin as an output:
   
8.   pinMode(ledPin, OUTPUT);
   
9.   // initialize serial communications:
   
10.   Serial.begin(9600);
    
11. }
    
12. 
    
13. void loop() {
    
14.   // read the value of the potentiometer:
    
15.   int analogValue = analogRead(analogPin);
    
16. 
    
17.   // if the analog value is high enough, turn on the LED:
    
18.   if (analogValue > threshold) {
    
19.     digitalWrite(ledPin, HIGH);
    
20.   }
    
21.   else {
    
22.     digitalWrite(ledPin, LOW);
    
23.   }
    
24. 
    
25.   // print the analog value:
    
26.   Serial.println(analogValue);
    
27.   delay(10);        // delay in between reads for stability
    
28. }

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       从程序可以看出，程序期望通过从A0口读取ADC的值，当读取的值大于1000时，点亮LED，小于1000时熄灭LED，LED灯由IO0控制。将LED灯的正级接IO0，负级接GND，将电位器的两端接3.3V和GND，中间接A0，运行程序，钮动电位器，观察LED灯是否受电位器控制。