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Ping Sensors (Read 1476 times)
crimson_arc
Ping Sensors
Mar 23rd, 2009, 4:18pm  
Hey I am working on a project for college and am having touble getting ping sensors to talk to processing. What i am trying to do is
1. When a user steps on a hot spot a default value is taken and saved and a camera starts to stream video.
2. As the user moves left/right a value is taken in and an objct is moved in processing relative to the default position.

I have only been able to get a simple push button talking to arduino. when i run the ultrasound example for some reason the arduino part is working but processing will not pick up the values - Distance 0  - is all that comes up. Am working on it for the next few days so will post up code soon. Any help would be much appreciated.

All the best
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crimson_arc
Re: Ping Sensors
Reply #1 - Apr 22nd, 2009, 7:29am  
Heres the first bit of code  Anyone got any ideas how to take the two ping outputs, convert to a useable number and have them move the  2 bubbles along the x axis.There will be one for each user - so maybe set a default position for each user and calculate distance from that.
Code:

    import processing.serial.*;
    Serial port; // The serial port
    int[] serialInArray = new int[1]; // Where we’ll put what we receive
    int serialCount = 0; // A count of how many bytes we receive
   // int xpos, ypos; // Starting position of the ball
    boolean firstContact = false; // Whether we’ve heard from the
    int speed = 15;
    float xpos;  // variables
    float ypos;
    float xspeed;
    
    
    void setup() {
    size(256, 256); // Stage size
    noStroke(); // No border on the next thing drawn
    
    // Set the starting position of the ball (middle of the stage)
    xpos = width/2;
    ypos = height/2;
    
    // Print a list of the serial ports, for debugging purposes:
    println(Serial.list());
    
    // I know that the first port in the serial list on my mac
    // is always my Keyspan adaptor, so I open Serial.list()[0].
    // On Windows machines, this generally opens COM1.
    // Open whatever port is the one you’re using.
    port = new Serial(this, Serial.list()[0], 9600);
    port.write(65); // Send a capital A to start the microcontroller
    
    }
    
    void draw() {
    background(0);
    //fill(fgcolor);
    fill(255);
    // Draw the shape
    ellipse(xpos, ypos, 20, 20);
    
    // If no serial data has beeen received, send again until we get some.
    // (in case you tend to start Processing before you start your
    // external device):
    if (firstContact == false) {
    delay(300);
    port.write(65);
    }
    }
    
    void serialEvent(Serial port) {
    // if this is the first byte received,
    // take note of that fact:
    if (firstContact == false) {
    firstContact = true;
    }
    // Add the latest byte from the serial port to array:
    serialInArray[serialCount] = port.read();
    serialCount++;
    
    // If we have 3 bytes:
    if (serialCount < 35 ) {
    xpos = serialInArray[0];
    xpos++;
    //else (serialCount <
    //ypos = serialInArray[1];
    //fgcolor = serialInArray[2];
    
    // print the values (for debugging purposes only):
    //println(xpos + “\t” + ypos + “\t” + fgcolor);
    //println(xpos + “\t” + ypos);
    
    // Send a capital A to request new sensor readings:
    port.write(65);
    // Reset serialCount:
    serialCount = 0;
    }
    }
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crimson_arc
Re: Ping Sensors
Reply #2 - Apr 24th, 2009, 6:05pm  
i'm have trouble getting the serial information to move the bubbles in the sketch. I've modifed a sketch from the making things talk book but can't seem to get the image in and moving anyone got any ideas?

Code:
import processing.serial.*;

int linefeed = 10;	// linefeed in ASCII
Serial myPort;	    // The serial port
int sensorValue = 0;    // the value from the sensor
int bubblePosition = 100;  // the horizontal position of the latest
PImage cow;		   // line to be drawn on the graph

int prevSensorValue = 0;    // the previous sensor reading
boolean fullOfLife = false;   
int threshold = 1;	  

int xDirection = 1;
int xPos;


void setup() {

  size(600, 600);

  println("Available serial ports:");
  println(Serial.list());

  // If you know the name of the port used by the Arduino board, you
  // can specify it directly like this.
  myPort = new Serial(this, "COM4", 9600);
  myPort.bufferUntil(linefeed);
}

void draw() {

  if (sensorValue > threshold ) {
    
    if (prevSensorValue <= threshold) {
	delay(100);
	if (sensorValue > threshold) {
	  fullOfLife = true;
	  //sendMail();
	}
    }
  } 
  else {
 
    if (prevSensorValue >= threshold) {
	fullOfLife = true;
    }
  }
  
  prevSensorValue = sensorValue;
}

void serialEvent(Serial myPort) {
  // read the serial buffer:
  String myString = myPort.readStringUntil(linefeed);
  // if you got any bytes other than the linefeed:
  if (myString != null) {
    //trim off the carriage return and convert the string to an integer:
    sensorValue = int(trim(myString));
    // print it:
    // println(sensorValue);
    drawBubble();
  }
} 

void drawBubble() {

  cow = loadImage("bubble.png");

  int bubbleHeight = sensorValue * 2;
  // draw the line:
  if (sensorValue >= threshold) {
    xDirection = +xDirection;    
  }

  else {

    if (sensorValue <= threshold) {
	xDirection = -xDirection;
    }
  }
}
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