Stable Library Help (Graph Blank)

Stable Library

Native lib Version = RXTX-2.1-7 Java lib Version = RXTX-2.1-7

[0] "COM1" [1] "COM14"

I just want to see the graph of my analog input. That one only shows. And the graph is blank. Don't know what's wrong? I am really noob at this...

This is my pulse code:

int sensePin = 0;

void setup()
{
  //Note: We don't need to specifiy sensePin as an
  //input, since it defaults to that when we read it

  //Allows us to listen to serial communications from the arduino
  Serial.begin(9600); 
}

void loop()
{
  // read the sensor
  int ledLevel = analogRead(sensePin);
  ledLevel = constrain(ledLevel, 40, 900);
  ledLevel = map(ledLevel, 40, 900, 0, 1000);    

  
  Serial.println(ledLevel); 
  delay(100);
}

For my graph:

 // Graphing sketch


 // This program takes ASCII-encoded strings
 // from the serial port at 9600 baud and graphs them. It expects values in the
 // range 0 to 1023, followed by a newline, or newline and carriage return

 // Created 20 Apr 2005
 // Updated 18 Jan 2008
 // by Tom Igoe
 // This example code is in the public domain.

 import processing.serial.*;

 Serial myPort;        // The serial port
 int xPos = 1;         // horizontal position of the graph
 int xIncrement = 10;
 float prevByte = 0;

 void setup () {
 // set the window size:
 size(1000, 500);        

 // List all the available serial ports
 println(Serial.list());
 // I know that the first port in the serial list on my mac
 // is always my  Arduino, so I open Serial.list()[0].
 // Open whatever port is the one you're using.
 myPort = new Serial(this, Serial.list()[0], 9600);
 // don't generate a serialEvent() unless you get a newline character:
 myPort.bufferUntil('\n');
 // set inital background:
 background(0);
 }
 void draw () {
 // everything happens in the serialEvent()
  
 }

 void serialEvent (Serial myPort) {
 // get the ASCII string:
 String inString = myPort.readStringUntil('\n');

 if (inString != null) {
 // trim off any whitespace:
 inString = trim(inString);
 // convert to an int and map to the screen height:
 float inByte = float(inString); 

 inByte = map(inByte, 0, 1000, 0, height/2);

 // draw the line:

 stroke(185,55,155);
 line(xPos-xIncrement, height/2-prevByte, xPos, height/2-inByte);

 prevByte = inByte;

 // at the edge of the screen, go back to the beginning:
 if (xPos >= width) {
 xPos = 0;
 background(0); 
 } 
 else {
 // increment the horizontal position:
 xPos += xIncrement;
 }
 }
 }

Please help thanks in advance...

First thing to do is to get the indentation of your code right, CTRL-T for the Arduino and I guess the same for processing. That makes the code far more readable. And readability is the first (2nd) step to understanding code.

wrt the problem,

is the line color perhaps the same as the background color? Would also result in an "empty" graph ...

robtillaart: First thing to do is to get the indentation of your code right, CTRL-T for the Arduino and I guess the same for processing. That makes the code far more readable. And readability is the first (2nd) step to understanding code.

wrt the problem,

is the line color perhaps the same as the background color? Would also result in an "empty" graph ...

ok sir