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Topic: Processing sur Arduino Uno (Read 829 times) previous topic - next topic

Fred73

Bonjour,

Je viens de commencer avec Arduino Uno et pour bien comprendre tous les principes j'ai décider de réaliser l'exercices suivant :
Exemple 08A : Lampe Internet Arduino du livre Démarrez avec Arduino.

Je rencontre des problème au niveau du Code Precessing !

En particulier sur cette ligne ci dessous :
"  URL url = new URL(feed);  // An object to represent the URL"

Le lociel processing me dit ceci : "Cannot find a class or type named "URL"

Ne pouvant pas valider le code processing je ne peux donc pas essayer et tester cette exercice ! :(

Pourriez vous m'aider à comprendre pourquoi celui ci ne me valide pas le code svp !

Merci d'avance

Je vous met le code processing dans ça totalité ci dessous :


// Example 08A: Arduino networked lamp
// parts of the code are inspired
// by a blog post by Tod E. Kurt (todbot.com)
//
// Copy and paste this example into an empty Processing sketch

import processing.serial.*;

String feed = "http://blog.makezine.com/index.xml";

int interval = 10;  // retrieve feed every 60 seconds;
int lastTime;       // the last time we fetched the content

int love    = 0;
int peace   = 0;
int arduino = 0;

int light = 0;  // light level measured by the lamp

Serial port;
color c;
String cs;

String buffer = ""; // Accumulates characters coming from Arduino

PFont font;

void setup() {
  size(640,480);
  frameRate(10);    // we don't need fast updates

  font = loadFont("HelveticaNeue-Bold-32.vlw"); 
  fill(255); 
  textFont(font, 32);
  // IMPORTANT NOTE:
  // The first serial port retrieved by Serial.list()
  // should be your Arduino. If not, uncomment the next
  // line by deleting the // before it, and re-run the
  // sketch to see a list of serial ports. Then, change
  // the 0 in between [ and ] to the number of the port
  // that your Arduino is connected to.
  println(Serial.list());
  String arduinoPort = Serial.list()[0];
  port = new Serial(this, arduinoPort, 9600); // connect to Arduino

  lastTime = 0;
  fetchData();
}

void draw() {
  background( c );
  int n = (interval - ((millis()-lastTime)/1000));

  // Build a colour based on the 3 values
  c = color(peace, love, arduino);
  cs = "#" + hex(c,6); // Prepare a string to be sent to Arduino

  text("Arduino Networked Lamp", 10,40);
  text("Reading feed:", 10, 100);
  text(feed, 10, 140);

  text("Next update in "+ n + " seconds",10,450);
  text("peace" ,10,200);
  text(" " + peace, 130, 200);
  rect(200,172, peace, 28);

  text("love ",10,240);
  text(" " + love, 130, 240);
  rect(200,212, love, 28);

  text("arduino ",10,280);
  text(" " + arduino, 130, 280);
  rect(200,252, arduino, 28);

  // write the colour string to the screen
  text("sending", 10, 340);
  text(cs, 200,340);

  text("light level", 10, 380);
  rect(200, 352,light/10.23,28); // this turns 1023 into 100

  if (n <= 0) {
    fetchData();
    lastTime = millis();
  }

  port.write(cs); // send data to Arduino

  if (port.available() > 0) { // check if there is data waiting
    int inByte = port.read(); // read one byte
    if (inByte != 10) { // if byte is not newline
      buffer = buffer + char(inByte); // just add it to the buffer
    }
    else {

      // newline reached, let's process the data
      if (buffer.length() > 1) { // make sure there is enough data

        // chop off the last character, it's a carriage return
        // (a carriage return is the character at the end of a
        // line of text)
        buffer = buffer.substring(0,buffer.length() -1);

        // turn the buffer from string into an integer number
        light = int(buffer);

        // clean the buffer for the next read cycle
        buffer = "";

        // We're likely falling behind in taking readings
        // from Arduino. So let's clear the backlog of
        // incoming sensor readings so the next reading is
        // up-to-date.
        port.clear();
      }
    }
  }

}

void fetchData() {
  // we use these strings to parse the feed
  String data;
  String chunk;

  // zero the counters
  love    = 0;
  peace   = 0;
  arduino = 0;
  try {
URL url = new URL(feed);  // An object to represent the URL
    // prepare a connection   
    URLConnection conn = url.openConnection();
    conn.connect(); // now connect to the Website

    // this is a bit of virtual plumbing as we connect
    // the data coming from the connection to a buffered
    // reader that reads the data one line at a time.
    BufferedReader in = new
      BufferedReader(new InputStreamReader(conn.getInputStream()));

    // read each line from the feed
    while ((data = in.readLine()) != null) {

      StringTokenizer st =
        new StringTokenizer(data,"\"<>,.()[] ");// break it down
      while (st.hasMoreTokens()) {
        // each chunk of data is made lowercase
        chunk= st.nextToken().toLowerCase() ;

        if (chunk.indexOf("love") >= 0 ) // found "love"?
          love++;    // increment love by 1
        if (chunk.indexOf("peace") >= 0)   // found "peace"?
          peace++;   // increment peace by 1
        if (chunk.indexOf("arduino") >= 0) // found "arduino"?
          arduino++; // increment arduino by 1
      }
    }

    // Set 64 to be the maximum number of references we care about.
    if (peace > 64)   peace = 64;
    if (love > 64)    love = 64;
    if (arduino > 64) arduino = 64;

    peace = peace * 4;     // multiply by 4 so that the max is 255,
    love = love * 4;       // which comes in handy when building a
    arduino = arduino * 4; // colour that is made of 4 bytes (ARGB)
  }
  catch (Exception ex) { // If there was an error, stop the sketch
    ex.printStackTrace();
    System.out.println("ERROR: "+ex.getMessage());
  }

}

Christian_R

Le code est à mettre entre balises # pour être plus lisible.
Quelle est ta version de Processing ?

Depuis la 2.0, il n'y a plus d'import systématique de certaines classes java, voir ici
http://wiki.processing.org/w/Cannot_find_a_class_or_type_named_%22Xyz%22
Christian

Fred73

Bonjour Christian,

Premièrement merci de ton aide.

J'ai la version Processing 2.1.1

Quel Import de Java dois - je utiliser ?!

C'est vraiment frustrant de ne pas arrivé à comprendre surtout aussi  prés du but !

Merci encore pour ton aide !


Christian_R

Le message d'erreur indique la classe qui manque
Code: [Select]
Cannot find a class or type named "URL"
Il faut aller voir cette page http://docs.oracle.com/javase/6/docs/api/
pour trouver que la classe URL est dans java.net.URL

Donc rajouter
import java.net.*;
Christian

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