Hello there,

I like using the data from a weather website. I got the number from the website by using proHTML library, and I tried to send this number to Arduino board via serial communication. This is my code to send a number to Arduino to control the motor.

import prohtml.*;
import processing.serial.*;

HtmlList htmlList;
Serial myPort;

void setup(){
 size(100,100);
 myPort = new Serial(this, Serial.list()[2], 9600);
}

void draw() {

 htmlList = new HtmlList("http://www.qwikcast.com/cgi-bin/forecast.cgi?zip=Kaohsiung,TW");
   
 println(htmlList.pageList.get(512));
 myPort.write(htmlList.pageList.get(512));
delay(1000);
}
 
And then I got a error message like this:

C:/DOCUME~1/JaeMin/LOCALS~1/Temp/build6856.tmp/Temporary_7990_5751.java:17:5:17:
44: Semantic Error: No applicable overload for a method with signature "write(java.lang.Object)" was found in type "processing.serial.Serial". Perhaps you wanted the overloaded version "void write(java.lang.String $1);" instead?

I read a reference of "write" function in serial. But I could not find any clue for this work. Is there a way to send the data for proHTML? or I would like to hear any comment to send data in proHTML.

Thanks in advance,

Jaemin

Dear Extrapixel,

Thank you for your reply to my question. I tried to use string which you recommend in my code, and I got a error message like that:

java.lang.ClassCastException: prohtml.TextElement cannot be cast to java.lang.String

So, I am starting to study about the string instead of using proHTML to get a humidity data from a weather website.

Thanks again,

Jaemin

Dear Extrapixel,

Thank you for your update. I used myPort.write(htmlList.pageList.get(512).toString()); on my code. I got a number of the humidity like 78, and I did not have an error message in the Processing. However, my Arduino did not response from the number. So, I tested using myPort.write(78) in my Processing code, and then Arduino turned a motor.

This is my Arduino code:

#include <Stepper.h>
int val;

#define motorSteps 20    

#define motorPin1 8
#define motorPin2 9
#define motorPin3 10
#define motorPin4 11
#define ledPin 13

Stepper myStepper(motorSteps, motorPin1, motorPin2, motorPin3, motorPin4);

void setup() {
 myStepper.setSpeed(180);
 Serial.begin(9600);
 pinMode(ledPin, OUTPUT);
}

void loop() {
  if (Serial.available()) {
   val = Serial.read();
  }
 if (val == 78) {
  digitalWrite(ledPin, HIGH);
  myStepper.step(10);
 } else {
  digitalWrite(ledPin, LOW);
  myStepper.step(-10);
 }
}

I am wondering that does a toString()method in the proHTML only work for a text? or is it possible to make htmlList element() to the number which works for Arduino?

Thanks in advance,

Jaemin  

Dear Extrapixel,

Finally, I got a serial communication with the whether website. My motor has a good response from the data, which is chaged from toString() to integer. I really appreciate your advise and concern to me.

Thanks again,

Jaemin