Real time graph plotting - My processing graph goes wrong side

Stonegaze

Hi.

I'm trying to make a pulse oximeter with Arduino UNO.

I've made basic electronic circuit using SFH-4557(850nm) LED, MTE6066N1-UR (650nm) LED, and OPT101P Photosensor. I think it works well.

Objective: The arduino sends two data(650nm, 850nm sensor values) respectively, and Processing receives these data and assign to different array variables and plotting...; (Sorry for poor English..)

But when I using processing 2.2.1, I've found out that my graph goes from right to left, and it looks like blinking boxes!!... I've used Tom Igoe's code in arduino homepage. I just modified it a little..

My code are here.. What's wrong with my code? Is this a frame rate problem? I don't understand what problem makes me crazy...

Please help..

import processing.serial.*;

Serial myPort;
int xPos = 1;

PFont f;

//Values of seperate LEDs
float[] S850Val = new float[600];
float[] S650Val = new float[600];

void setup() {
  size(600, 600);
  frameRate(60);
  println(Serial.list());

  myPort = new Serial(this, Serial.list()[0], 9600);
  myPort.bufferUntil('\n');
  background(0);

  f = createFont("Arial", 32, true);
}


void draw() {
  String inString = myPort.readStringUntil('\n');

  if (inString != null) {
    inString = trim(inString);

    float inByte = float(inString);

    inByte = map(inByte, 0, 1023, 0, 300);


    //assign Sensor 850nm, Sensor650
    for (int i = 0; i < 600; i++){
      if (inByte < 200.0) {
        S850Val[i] = inByte;
      } else {
        S650Val[i] = inByte;
      }
    }


    //drawing both sensor's data
    for (int j = 0; j < 600; j++){
      if(xPos >= width){
        xPos = 0;
        background(0);
      }else{
        xPos++;}
      //Printing legend..  
      textFont(f);
      fill(255);
      text("650nm", 10, 32);
      text("850nm", 10, 332);
      //Drawing graph     
      stroke(255);
      line(xPos, 300, xPos, (300 - S650Val[j]) + 100);
      line(xPos, 600, xPos, (600 - (S850Val[j] * 10) - 100));
      //Test print (Temporary serial output)
      println(S650Val[j]);
      println(S850Val[j]);     
    }    
  }
}

orangeLaughter

Hi wondering if you solved this problem? Currently trying to plot to values on the same graph as well