Arduino内置教程-通讯-物理像素

物理像素

  • 这个例子示范了怎么用Arduino或者Genuino开发板来接受来自电脑的数据。当接受到字符“H”时，开发板打开LED；而接受到字符“L”时，开发板关闭LED灯。

  • 数据从Arduino IDE串口监视器或者其他类似Processing，Flash，PD，Max/MSP之类的程序发送。

硬件要求

  • Arduino or Genuino 开发板
  • LED (可选择)
  • 220 ohm 电阻 (optional)

软件要求

  • Processing 或者 Max/MSP version 5

电路
很多Arduino和Genuino开发板有一个连接到pin13的内置LED灯。如果你的开发板没有内置LED灯，连接一个额外的LED灯到pin13。长腿或者阳极，通过一个220 ohm电阻连接到pin13。短腿或者阴极，连接到地。

请输入图片描述

原理图
请输入图片描述

样例代码

/*
  Physical Pixel

 An example of using the Arduino board to receive data from the
 computer.  In this case, the Arduino boards turns on an LED when
 it receives the character 'H', and turns off the LED when it
 receives the character 'L'.

 The data can be sent from the Arduino serial monitor, or another
 program like Processing (see code below), Flash (via a serial-net
 proxy), PD, or Max/MSP.

 The circuit:
 * LED connected from digital pin 13 to ground

 created 2006
 by David A. Mellis
 modified 30 Aug 2011
 by Tom Igoe and Scott Fitzgerald

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/PhysicalPixel
 */

const int ledPin = 13; // the pin that the LED is attached to
int incomingByte;      // a variable to read incoming serial data into

void setup() {
  // initialize serial communication:
  Serial.begin(9600);
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // see if there's incoming serial data:
  if (Serial.available() > 0) {
    // read the oldest byte in the serial buffer:
    incomingByte = Serial.read();
    // if it's a capital H (ASCII 72), turn on the LED:
    if (incomingByte == 'H') {
      digitalWrite(ledPin, HIGH);
    }
    // if it's an L (ASCII 76) turn off the LED:
    if (incomingByte == 'L') {
      digitalWrite(ledPin, LOW);
    }
  }
}

/* Processing code for this example

 // mouseover serial

 // Demonstrates how to send data to the Arduino I/O board, in order to
 // turn ON a light if the mouse is over a square and turn it off
 // if the mouse is not.

 // created 2003-4
 // based on examples by Casey Reas and Hernando Barragan
 // modified 30 Aug 2011
 // by Tom Igoe
 // This example code is in the public domain.



 import processing.serial.*;

 float boxX;
 float boxY;
 int boxSize = 20;
 boolean mouseOverBox = false;

 Serial port;

 void setup() {
 size(200, 200);
 boxX = width/2.0;
 boxY = height/2.0;
 rectMode(RADIUS);

 // List all the available serial ports in the output pane.
 // You will need to choose the port that the Arduino board is
 // connected to from this list. The first port in the list is
 // port #0 and the third port in the list is port #2.
 // if using Processing 2.1 or later, use Serial.printArray()
 println(Serial.list());

 // Open the port that the Arduino board is connected to (in this case #0)
 // Make sure to open the port at the same speed Arduino is using (9600bps)
 port = new Serial(this, Serial.list()[0], 9600);

 }

 void draw()
 {
 background(0);

 // Test if the cursor is over the box
 if (mouseX > boxX-boxSize && mouseX < boxX+boxSize &&
 mouseY > boxY-boxSize && mouseY < boxY+boxSize) {
 mouseOverBox = true;
 // draw a line around the box and change its color:
 stroke(255);
 fill(153);
 // send an 'H' to indicate mouse is over square:
 port.write('H');
 }
 else {
 // return the box to it's inactive state:
 stroke(153);
 fill(153);
 // send an 'L' to turn the LED off:
 port.write('L');
 mouseOverBox = false;
 }

 // Draw the box
 rect(boxX, boxY, boxSize, boxSize);
 }


 */

/*
Max/MSP version 5 patch to run with this example:

----------begin_max5_patcher----------
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.P0K+3peBt3NskC
-----------end_max5_patcher-----------


 */

[Get Code]
Processing 代码
从上面的样例代码里复制processing代码。随着你鼠标经过中心方块区域，pin13上的LED灯应该会打开和关闭。processing的小程序看起来像这样：

请输入图片描述
鼠标经过中心方块区域来使LED灯打开和关闭

Max patch

Max/MSP patch看起来像下面的图案。从上面的样例代码复制，然后粘贴到一个新的patch窗口

请输入图片描述

更多

  • serial.read()
  • serial.available()
  • if statement
  • ASCIITable - 示范使用Arduino的高等的串口输出函数。
  • Dimmer - 移动鼠标来改变LED灯的亮度
  • Graph - 发送数据到电脑，然后在Processing里画出它的图表。
  • Midi - 连续发送MIDI音符信息
  • MultiSerialMega - 使能Arduino Mega上2个串口。
  • PhysicalPixel - 通过从Processing或者Max/MSP发送数据到Arduino上，使LED开关。
  • ReadASCIIString - 分析整数里一个用逗号分隔的字符串，来使一个LED灯褪色。
  • SerialCallResponse - 通过一个呼-应的方法（握手）来发送多个变数
  • SerialCallResponseASCII - 通过一个呼-应的方法（握手）来发送多个变数，并在发送前解码（ASCII）这些数值。
  • SerialEvent - 使用SerialEvent()函数
  • VirtualColorMixer - 从Arduino发送多个变数到你的电脑，然后在Processing或者Max/MSP上读取这些数据

标签: arduino内置教程, arduino物理像素