arduino ibox项目实战25－Smoothing实验

armeasy

硬件平台：PC机一台，ibox卡片电脑一只，arduino扩展板一个，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ADC读取电压值，每次取十次读到的电压值的平均值。

打开arduino的IDE开发工具，依次点击文件->示例-> 03.Analog->Smoothing，Smoothing的示例程序将会被打开，其源码如下：

1. const int numReadings = 10;
   
2. 
   
3. int readings[numReadings];      // the readings from the analog input
   
4. int readIndex = 0;              // the index of the current reading
   
5. int total = 0;                  // the running total
   
6. int average = 0;                // the average
   
7. 
   
8. int inputPin = A0;
   
9. 
   
10. void setup()
    
11. {
    
12.   // initialize serial communication with computer:
    
13.   Serial.begin(9600);
    
14.   // initialize all the readings to 0:
    
15.   for (int thisReading = 0; thisReading < numReadings; thisReading++)
    
16.     readings[thisReading] = 0;
    
17. }
    
18. 
    
19. void loop() {
    
20.   // subtract the last reading:
    
21.   total = total - readings[readIndex];
    
22.   // read from the sensor:
    
23.   readings[readIndex] = analogRead(inputPin);
    
24.   // add the reading to the total:
    
25.   total = total + readings[readIndex];
    
26.   // advance to the next position in the array:
    
27.   readIndex = readIndex + 1;
    
28. 
    
29.   // if we're at the end of the array...
    
30.   if (readIndex >= numReadings)
    
31.     // ...wrap around to the beginning:
    
32.     readIndex = 0;
    
33. 
    
34.   // calculate the average:
    
35.   average = total / numReadings;
    
36.   // send it to the computer as ASCII digits
    
37.   Serial.println(average);
    
38.   delay(1);        // delay in between reads for stability
    
39. }

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       将电位器的两端分别接5V和GND，中间的端口接A0，运行程序，观察调试窗口上的打印信息。