Arduino内置教程-通讯-可视颜色混合器

简介

这个例子示范了怎么从Arduino开发板发送多个数值到电脑。从三个电位计读到的数值被用来设置Processing或Max/MSP的后台颜色的红，绿和蓝零件。

硬件要求

• Arduino or Genuino 开发板
• 3 模拟传感器 (电位计, 光敏电阻, FSR,等等)
• 3*10KΩ 电阻
• 连接线
• 开发板

软件要求

• Processing 或者 Max/MSP version 5

电路

连接模拟传感器到模拟引脚pin0，1，2。

这个电路用三个分压器来产生来自压力传感电阻的模拟电压。一个分压器有两个电阻串联，以便合理地分压。

原理图

样例代码

这个传感值作为ASCII-encoded 数字从Arduino发送到电脑。这意味着每个数字是用ASCII字符“0”到“9”发送的。以“234”为例子，共发送了三个字节：ASCII “2” (binary value 50), ASCII “3” (binary value 51), 和ASCII “4” (binary value 52).

const int redPin = A0;      // sensor to control red color
const int greenPin = A1;    // sensor to control green color
const int bluePin = A2;     // sensor to control blue color

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

void loop() {
  Serial.print(analogRead(redPin));
  Serial.print(",");
  Serial.print(analogRead(greenPin));
  Serial.print(",");
  Serial.println(analogRead(bluePin));
}

/* Processing code for this example

//  This example code is in the public domain.

import processing.serial.*;

float redValue = 0;        // red value
float greenValue = 0;      // green value
float blueValue = 0;       // blue value

Serial myPort;

void setup() {
  size(200, 200);

  // List all the available serial ports
  // if using Processing 2.1 or later, use Serial.printArray()
  println(Serial.list());

  // I know that the first port in the serial list on my mac
  // is always my  Arduino, so I open Serial.list()[0].
  // Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[0], 9600);
  // don't generate a serialEvent() unless you get a newline character:
  myPort.bufferUntil('\n');
}

void draw() {
  // set the background color with the color values:
  background(redValue, greenValue, blueValue);
}

void serialEvent(Serial myPort) {
  // get the ASCII string:
  String inString = myPort.readStringUntil('\n');

  if (inString != null) {
    // trim off any whitespace:
    inString = trim(inString);
    // split the string on the commas and convert the
    // resulting substrings into an integer array:
    float[] colors = float(split(inString, ","));
    // if the array has at least three elements, you know
    // you got the whole thing.  Put the numbers in the
    // color variables:
    if (colors.length >=3) {
      // map them to the range 0-255:
      redValue = map(colors[0], 0, 1023, 0, 255);
      greenValue = map(colors[1], 0, 1023, 0, 255);
      blueValue = map(colors[2], 0, 1023, 0, 255);
    }
  }
}

 */

/* Max/MSP patch for this example

 ----------begin_max5_patcher----------
1512.3oc4Z00aaaCE8YmeED9ktB35xOjrj1aAsXX4g8xZQeYoXfVh1gqRjdT
TsIsn+2K+PJUovVVJ1VMdCAvxThV7bO7b48dIyWtXxzkxaYkSA+J3u.Sl7kK
lLwcK6MlT2dxzB5so4zRW2lJXeRt7elNy+HM6Vs61uDDzbOYkNmo02sg4euS
4BSede8S2P0o2vEq+aEKU66PPP7b3LPHDauPvyCmAvv4v6+M7L2XXF2WfCaF
lURgVPKbCxzKUbZdySDUEbgABN.ia08R9mccGYGn66qGutNir27qWbg8iY+7
HDRx.Hjf+OPHCQgPdpQHoxhBlwB+QF4cbkthlCRk4REnfeKScs3ZwaugWBbj
.PS+.qDPAkZkgPlY5oPS4By2A5aTLFv9pounjsgpnZVF3x27pqtBrRpJnZaa
C3WxTkfUJYA.BzR.BhIy.ehquw7dSoJCsrlATLckR.nhLPNWvVwL+Vp1LHL.
SjMG.tRaG7OxT5R2c8Hx9B8.wLCxVaGI6qnpj45Ug84kL+6YIM8CqUxJyycF
7bqsBRULGvwfWyRMyovElat7NvqoejaLm4f+fkmyKuVTHy3q3ldhB.WtQY6Z
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.OkjD4H5OllyS+.3FlhY0so4xRlWqyrXErQpt+2rsnXgQNZHZgmMVzEofW7T
S4zORQtgIdDbRHrObRzSMNofUVZVcbKbhQZrSOo934TqRHIN2ncr7BF8TKR1
tHDqL.PejLRRPKMR.pKFAkbtDa+UOvsYsIFH0DYsTCjqZ66T1CmGeDILLpSm
myk0SdkOKh5LUr4GbWwRYdW7fm.BvDmzHnSdH3biGpSbxxDNJoGDAD1ChH7L
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q3ZI8.psJpkpJnyPzwmXBj7Sh.+bNvVZxlcKAm0OYHIxcIjzEKdRChgO5UMf
LkMPNN0MfiS7Ev6TYQct.F5IWcCZ4504rGsiVswGWWSYyma01QcZgmL+f+sf
oU18Hn6o6dXkMkFF14TL9rIAWE+6wvGV.p.TPqz3HK5L+VxYxl4UmBKEjr.B
6zinuKI3C+D2Y7azIM6N7QL6t+jQyZxymK1ToAKqVsxjlGyjz2c1kTK3180h
kJEYkacWpv6lyp2VJTjWK47wHA6fyBOWxH9pUf6jUtZkLpNKW.9EeUBH3ymY
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9vSu4WI1PMBGXye6KXvNuzmZTh7U9h5j6vvASdngPdgOFxycNL6ia1axUMmT
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bg7Y1yXjlKW6SrZnguQdsSfOSSDItqv2jwJFjavc1vO7OigyBr2+gDYorRk1
HXZpVFfu2FxXkZtfp4RQqNkX5y2sya3YYL2iavWAOaizH+pw.Ibg8f1I9h3Z
2B79sNeOHvBOtfEalWsvyu0KMf015.AaROvZ7vv5AhnndfHLbTgjcCK1KlHv
gOk5B26OqrXjcJ005.QqCHn8fVTxnxfj93SfQiJlv8YV0VT9fVUwOOhSV3uD
eeqCUClbBPa.j3vWDoMZssNTzRNEnE6gYPXazZaMF921syaLWyAeBXvCESA8
ASi6Zyw8.RQi65J8ZsNx3ho93OhGWENtWpowepae4YhCFeLErOLENtXJrOSc
iadi39rf4hwc8xdhHz3gn3dBI7iDRlFe8huAfIZhq
-----------end_max5_patcher-----------


 */

Processing 代码

从上面的样例代码里复制processing程序。随着你改变模拟传感器的值，背景颜色会发生改变：

Max 代码

max程序看起来像这样。复制上面样例代码的文本，然后粘贴到新的Max窗口。