Problem to receive serial data from processing to arduino duemilanove

Projects Interfacing w/ Software on the Computer
1

Hi all,
Does anyone has information to receive data commnunication from processing to "arduino duemilanove" by sending "0" or "1" byte through serial ? I've received nothing when communicate from serial to arduino and need someone to further guide me. Those reference I took from websites "Connecting Arduino to Processing - SparkFun Learn"

My coding in processing:

import processing.serial.*;
Serial myport;

void setup(){

String portname = Serial.list()[0];
myport = new Serial(this,portname,9600);

}

void draw(){

if (myport.available() > 0 )
{
myport.write("1");
println("Print 1 to arduino Now");
}

}

My coding in arduino : (I'd tried to monitor incoming byte from process in serial monitor)

int incomingByte = 0 ;

void setup()
{

Serial.begin(9600);

}

void loop()
{

if (Serial.available() > 0 )
{
incomingByte = Serial.read();
Serial.print("check :");
Serial.println(incomingByte,DEC);
}

}

The situation is weird where It show nothing happened and returned empty in output once I opened serial monitor to check out. I've managed to pluged in to power arduino(First) and click to run processing(second).
How i could possible to receive "1" from processing to arduino through serial monitor?

Hopw someone could guide me in further, Thanks.

2

I don't know Processing. You may find some useful stuff in Serial Input Basics

Please use the code button </> so your code looks like this and is easy to copy to a text editor

...R

3 
if (myport.available() > 0 ) {
    myport.write("1");
    println("Print 1 to arduino Now");
}

"If something was received, then start a never ending stream of output"

seems to me a very strange strategy for a communication.

4 
int incomingByte = 0 ;

That is stupid. That variable REALLY should be called incomingFloat, don't you think?

5

PaulS:

int incomingByte = 0 ;

That is stupid. That variable REALLY should be called incomingFloat, don't you think?

This may be a little too cryptic for a beginner. What @PaulS means is that if you want to receive an int you should have
int incomingInt = 0 ;
and if you want to receive a byte (which is more likely) you should have
byte incomingByte = 0 ;

...R