移動滑鼠控制 LED 明暗

您可以透過左右移動滑鼠來控制 LED 的明暗，往右變亮，往左變暗。

原文詳 http://arduino.cc/en/Tutorial/Dimmer


電路圖

Arduino Code

const int ledPin = 9;      // the pin that the LED is attached to

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

void loop() {
  byte brightness;

  // check if data has been sent from the computer:
  if (Serial.available()) {
    // read the most recent byte (which will be from 0 to 255):
    brightness = Serial.read();
    // set the brightness of the LED:
    analogWrite(ledPin, brightness);
  }
}


Processing Code

// Dimmer - sends bytes over a serial port
// by David A. Mellis
//This example code is in the public domain.

import processing.serial.*;
Serial port;

void setup() {
  size(256, 150);

  println("Available serial ports:");
  println(Serial.list());

  // Uses the first port in this list (number 0).  Change this to
  // select the port corresponding to your Arduino board.  The last
  // parameter (e.g. 9600) is the speed of the communication.  It
  // has to correspond to the value passed to Serial.begin() in your
  // Arduino sketch.
  port = new Serial(this, "COM5", 9600);

  // If you know the name of the port used by the Arduino board, you
  // can specify it directly like this.
  //port = new Serial(this, "COM1", 9600);
}

void draw() {
  // draw a gradient from black to white
  for (int i = 0; i < 256; i++) {
    stroke(i);
    line(i, 0, i, 150);
  }

  // write the current X-position of the mouse to the serial port as
  // a single byte
  port.write(mouseX);
}

提醒您

1. LED 要插在 pin 9，或是其它 PWM 埠。
2. 檢查 COM 埠有沒有正確。
3. 檢查 鮑率 是不是 9600。


建議

您也可以修改程式碼，把它改成可以控制舵機角度。