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Drawing analog inputs (Read 1434 times)
gilles
Drawing analog inputs
Feb 5th, 2010, 5:13am  
Hi there,
I'm new to this Processing forum and I appologise if this is not the right place for posting my question.
Basically, I manage to connect through firmata to my arduino which has a photoresistor connected on one of theanalog inputs. What I'm trying to achieve in processing is a drawing of this analog input following a timeline : I would pull the analog input every second or so and output it on a timeline. I could do all this by myself but I guess I'm not the first one to try it. I've been reviewing all contribute librairies but couldn't find any suitable. Maybe I'm looking for the wrong thing ?
Anyway, if anyone has a clue of how to output dynamically an anlog value following a timeline without re-inventing the wheel, would be nice to know ...
Smiley

Thanks,
Gilles
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hndrsn
Re: Drawing analog inputs
Reply #1 - Feb 14th, 2010, 1:31pm  
Hey, you can draw a simple graph from an analog input fairly easily if that's what you're after. This is from the arduino examples btw - if you wanted anything more specific let me know!

Arduino code

Code:


int analogPin = 0;
float xPos = 0;
void setup(){
serial.begin(9600);
}
void draw(){
serial.println(analogRead(analogPin));
delay(20); //change the delay time here
}


Processing code

Code:

import processing.serial.*;
Serial port

void setup(){
  size(600,255);
  port = new Serial(this, Serial.list[0], 9600);
  port.bufferUntil('\n');
}

void draw(){
}

void serialEvent (Serial port) {

  String inString = port.readStringUntil('\n');

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

    float inByte = float(inString); 
    inByte = map(inByte, 0, 1023, 0, height);

    stroke(inByte,0,255);
    noFill();
    line(xPos, height - inByte, xPos, height);

    if (xPos >= width) {
      xPos = 0;
      background(0); 
    } 
    else {
      xPos++;
    }
  }
}
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