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标题: arduino ibox项目实战25－Smoothing实验 [打印本页]
作者: armeasy    时间: 2014-10-28 14:23
标题: arduino ibox项目实战25－Smoothing实验
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;

  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

  8. int inputPin = A0;

  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. }

  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;

  29.   // if we're at the end of the array...
  30.   if (readIndex >= numReadings)
  31.     // ...wrap around to the beginning:
  32.     readIndex = 0;

  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. }
复制代码
       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。





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