strange situation with sending data from Processing to Arduino!

jimbbq

Dear all

I wonder if anyone can help me here... I am trying to send an integer to Arduino to dim the LED. Below is the rather simple code which works:

When I removed delay(100) from both processing and arduino code, it does not work at all (LED does not dim). when I put delay (50), it works too, but when I put delay(10), it kind of works but the LED is flickering.... I am wondering what is going on here? Has it got anything to do with the speed of loop() and draw()?

thanks Jim

processing:

// import the serial library
 import processing.serial.*;
 // create a serial port variable
 Serial myPort;

 void setup(){
  size(300,300);
 // create an instance of the serial library 
  myPort = new Serial(this, Serial.list()[4], 9600);
 }

void draw(){
   //map the mouseX value from (0…width) to (0,255)
   float brightness = map(mouseX, 0, width, 0,255);
   //convert float to int
   int brightness1 = int(brightness);
   background(brightness1);//set background colour
   myPort.write(brightness1);//write the brightness value to the port

   delay(100); 
}

Arduino:

int incomingByte = 0;

void setup() {
  // initialise serial communication
  Serial.begin(9600);
  pinMode(9, OUTPUT);     
}

void loop() {
   //read the data sent from Processing 
   incomingByte = Serial.read();
   analogWrite(9, incomingByte);
   delay(100);
}

camperos

connection too fast?,,try, put a delay in the setup.
                void setup(){
                  size(300,300);
                 // create an instance of the serial library 
                  myPort = new Serial(this, Serial.list()[4], 9600);
                         delay (2000);

}