Please Help.. Basic template of RADAR..

shammireborn

Hello guys.. i am new to processing IDE. I have a code of a basic Radar spotting template. when using Arduino IDE i can see the values coming back from sensor using serial print. But in processing this code is not drawing the objects detected in a range. Please help what changes i have to make. in this code.. i got this code from website..

import processing.serial.*;
Serial port;
Serial port2;
String data = "";
String Radius = "";
String Theta = "";
int index = 0;
float distance = 0;
float angle = 0;
float pi = 22.0/7;

void setup() 
{
 
 size(1000,1000);
 background(255,255,255);
  ellipse(500,500,1000,1000);
 line(500,0,500,1000);
 line(0,500,1000,500);
 line(500,500,1000,0);
 line(500,500,0,0);

port = new Serial(this, "COM3", 9600);
port.bufferUntil('.');
}

void draw()

{


}

void serialEvent(Serial port)
{

  data = port.readStringUntil('.');
  data = data.substring(0, data.length() - 1);  
  index = data.indexOf(",");
  Radius = data.substring(0, index);
  Theta = data.substring (index+1 , data.length());
  
   translate(500,500);
   point (0,0);
   
      distance = float(Radius); 
      angle = float(Theta) /180 * pi; 
      fill(30,200,30);
      ellipse(distance * cos(angle) ,  -1 * distance * sin(angle) , 5,5);


}

Any suggestions is worth a gold... Thank you

PhiLho

See How to format code and text, particularly about the order of operations...

shammireborn

i corrected it.. please help me

shammireborn

anyone please help people

PhiLho

I know nothing about serial port and Arduino, not having one. BTW, this should be in the Arduino category. I will move it.

But are you use the COM10 port is the right one?

shammireborn

its COM3

shammireborn

Its actually processing code.. but only link is that it reads the values from arduino UNO board serially

Chrisir

can you post the arduino code?

( Arduino category just means it's Arduino related)

koogs

There is a PI constant you can use instead of defining it yourself.

In fact there's a degree () / radians () method you can use for converting between the two (line 47)

Try printing out Radius and Theta and paste the values here.

shammireborn

@Chrisir Here is the Arduino code

#define ECHOPIN 7        // Pin to receive echo pulse 
#define TRIGPIN 8
#include 

Servo myservo; // create servo object to control a servo
int pos = 0; // variable to store the servo position
void setup() {
 Serial.begin(9600); 

  myservo.attach(9); // attaches the servo on pin 9 to the servo object
  pinMode(3,OUTPUT);
  pinMode(12,OUTPUT);
  pinMode(13,INPUT);
  pinMode(ECHOPIN, INPUT); 
  pinMode(TRIGPIN, OUTPUT); 
}

void Print (int R , int T)
{
   Serial.print(R);Serial.print(", ");
   Serial.print(T);Serial.println(".");
   delay(100);
}

float Distance () {
  
  digitalWrite(TRIGPIN, LOW); 
  delayMicroseconds(2); 
  digitalWrite(TRIGPIN, HIGH); 
  delayMicroseconds(10); 
  digitalWrite(TRIGPIN, LOW);
  // Distance Calculation
  
  float distance = pulseIn(ECHOPIN, HIGH); 
  distance= distance/58; 
  return(distance);
}

shammireborn

@koogs here is the angle and Radius values

CONSLOE OUT

Angle 0.78571427
Radius 170
Angle 0.83809525
Radius 
170
Angle 0.89047617
Radius 
170
Angle 0.94285715
Radius 
170
Angle 0.99523807
Radius 
170
Angle 1.0476191
Radius 
156
Angle 1.0999999
Radius 
155
Angle 1.152381
Radius 
17
Angle 1.2047619
Radius 
5
Angle 1.2571429
Radius 
15

Chrisir

after 37 do a println(data);

Chrisir

do println distance * cos(angle

also try trim on data after line 37

do you receive anything at all?

koogs

are those newlines in the data or just part of your formatting? because they could cause parse errors.

i always print delimiters around things so that i can see - println("Data [" + data + "]");

try, as chrisir points out, printing the derived values - angle and distance. we only need a dozen, not 200 8)

shammireborn

guys its actually printing in the graph but its printing in the top left corner of the window the image is shown below

shammireborn

thanks for the support guys i understood how to fix it.. here i am submitting a correct code here

import processing.serial.*;
Serial port;
Serial port2;
String data = "";
String Radius = "";
String Theta = "";
int index = 0;
float distance = 0;
float angle = 0;
float pi = 22.0/7;
float x;
float y;

void setup() 
{
 
 size(1000,1000);
 background(255,255,255);
  ellipse(500,500,1000,1000);
 line(500,0,500,1000);
 line(0,500,1000,500);
 line(500,500,1000,0);
 line(500,500,0,0);

port = new Serial(this, "COM3", 9600);
port.bufferUntil('.');
}

void draw()

{
   translate(500,500);
   point (0,0);
ellipse(x , -y, 20, 20);
      fill(7,7,234);

}

void serialEvent(Serial port)
{

  data = port.readStringUntil('.');
  data = data.substring(0, data.length() - 1);  
  index = data.indexOf(",");
  Radius = data.substring(0, index);
  Theta = data.substring (index+1 , data.length());
  
   //translate(500,5000);
  // point (0,0);
   
      distance = float(Radius); 
      angle = float(Theta) /180 * pi; 
      x=distance * cos(angle);
      y=distance*sin(angle);
       print("\nAngle",x);
      print("\nRadius",y);
    //  ellipse(x , y, 20.0, 20.0);
     // fill(30,200,30);
      

}

Chrisir

so the issue was to have it in draw() is better than to have it in serialEvent() ?

koogs

another thing - the translate() in serialEvent() would be cumulative

Chrisir

ah, good one!

shammireborn

Ya@ Chirsir

And @ koogs cumulative you mean? I am quite confused now.

Chrisir

basically in the old version the translate do add up, because they never get resetted - so it would be soon outside the window

nvm

in the new version it takes place in draw which runs on and on but resets the matrix every new loop

shammireborn

oh okay.. got it..