Arduino内置教程-通讯-图表

介绍

这个例子展示怎么从Arduino或者Genuino发送字节数据到个人电脑，并用图表绘制结果。这个叫串口通讯，因为开发板和电脑似乎通过串口连接，即使它实际用USB接口，一个串口-USB和一个USB-串口转换器。

你可以用Arduino IDE的串口监视器来观察发送的数据，或者它可以通过 Processing (看下面的代码), Flash, PD, Max/MSP等读取。

硬件要求

• Arduino or Genuino 开发板
• 模拟传感器 (电位计, 光电池, FSR, 等等)

软件要求

• Processing 或者 Max/MSP version 5

电路图

连接电位计或者其他模拟传感器到模拟输入引脚A0

原理图

样例代码

void setup() {
  // initialize the serial communication:
  Serial.begin(9600);
}

void loop() {
  // send the value of analog input 0:
  Serial.println(analogRead(A0));
  // wait a bit for the analog-to-digital converter
  // to stabilize after the last reading:
  delay(2);
}

/* Processing code for this example

 // Graphing sketch


// This program takes ASCII-encoded strings
// from the serial port at 9600 baud and graphs them. It expects values in the
// range 0 to 1023, followed by a newline, or newline and carriage return

// Created 20 Apr 2005
// Updated 24 Nov 2015
// by Tom Igoe
// This example code is in the public domain.

import processing.serial.*;

Serial myPort;        // The serial port
int xPos = 1;         // horizontal position of the graph
float inByte = 0;

void setup () {
  // set the window size:
  size(400, 300);

  // 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');

  // set inital background:
  background(0);
}
void draw () {
  // draw the line:
  stroke(127, 34, 255);
  line(xPos, height, xPos, height - inByte);

  // at the edge of the screen, go back to the beginning:
  if (xPos >= width) {
    xPos = 0;
    background(0);
  } else {
    // increment the horizontal position:
    xPos++;
  }
}


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

  if (inString != null) {
    // trim off any whitespace:
    inString = trim(inString);
    // convert to an int and map to the screen height:
    inByte = float(inString);
    println(inByte);
    inByte = map(inByte, 0, 1023, 0, height);
  }
}

*/

/* Max/MSP v5 patch for this example
 ----------begin_max5_patcher----------
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-----------end_max5_patcher-----------

 */

Processing 程序

用上面代码例子里的Processing程序，你可以获得一个传感值图表。随着你改变传感器的值，你会获得像下面那样的东西：

Max 代码

max补丁看起来像这样。补丁的文本在上面的代码例子里。复制文本，然后粘贴到一个新的Max窗口来看程序。