arduino 가변 저항을 이용한 ADC 예제

과제 :아두이노에서 가변저항을 이용하여 들어오는 analog 값을 digital로 연산하는 ADC를 좀더 쉽게 이해하기 위해 제작
아두이노에서 가변저항으로 들어오는 값을 가지고 PC에서 만든 processing 어플과 연동 함.

회로 구성
source code
arduino code\

void setup()
{
  Serial.begin(9600);
}

int x = 50;
int x_backup = 50;
void loop(){

   //adc0  read
   x = analogRead(A0);
      
   if(( abs(x - x_backup)>10))
   {
   //write adc0 
     Serial.print(x);
     delay(15); 
     x_backup = x;
   }
}

processing code (빨간 부분을 추가함)
base code : Demos -> Performance -> DynamicParticlesImmediate
serial read and write : http://www.processing.org/reference/libraries/serial/\

PImage sprite;  
import processing.serial.*;
Serial myPort;  // The serial port

int npartTotal = 10000;
int npartPerFrame = 25;
float speed = 1.0;
float gravity = 0.05;
float partSize = 20;

int partLifetime;
PVector positions[];
PVector velocities[];
int lifetimes[];  

int fcount, lastm;
float frate;
int fint = 3;

void setup() {
  size(1024, 1024, P3D);
  frameRate(120);
  
  sprite = loadImage(“sprite.png”);

  partLifetime = npartTotal / npartPerFrame;
  initPositions();
  initVelocities();
  initLifetimes(); 

  // Writing to the depth buffer is disabled to avoid rendering
  // artifacts due to the fact that the particles are semi-transparent
  // but not z-sorted.
  hint(DISABLE_DEPTH_MASK);
  
  // Testing some hints
  //hint(DISABLE_TRANSFORM_CACHE);
  //hint(ENABLE_ACCURATE_2D);
  
  //test for serial input by sulac
  // List all the available serial ports
  println(Serial.list());
  // Open the port you are using at the rate you want:
  myPort = new Serial(this, Serial.list()[1], 9600);
 // end test for serial input by sulac 
} 

int x = 0, x_posi = 0 ;
int y = 0, y_posi = 0;
String sx;
String sy;
void draw () {
  background(0);

// test for serial input by sualc
   byte[] inBuffer = new byte[1024];
   
    if(myPort.available() > 0) {
      inBuffer = myPort.readBytes();
      myPort.readBytes(inBuffer);
      if (inBuffer != null) {
        String myString = new String(inBuffer);
        print(“inputdata : “);
        println(myString);

        x=Integer.parseInt(myString);
        println(x);
      }
    }
    
// end test for serial input by sulac

  for (int n = 0; n < npartTotal; n++) {
    lifetimes[n]++;
    if (lifetimes[n] == partLifetime) {
      lifetimes[n] = 0;
    }      

    if (0 <= lifetimes[n]) {      
      float opacity = 1.0 - float(lifetimes[n]) / partLifetime;
            
      if (lifetimes[n] == 0) {
        // Re-spawn dead particle
     //  positions[n].x = mouseX;
       positions[n].x = x;
        positions[n].y = mouseY;
        
        float angle = random(0, TWO_PI);
        float s = random(0.5 * speed, 0.5 * speed);
        velocities[n].x = s * cos(angle);
        velocities[n].y = s * sin(angle);
      } else {
        positions[n].x += velocities[n].x;
        positions[n].y += velocities[n].y;
        
        velocities[n].y += gravity;
      }
      drawParticle(positions[n], opacity);
    }
  }
  
  fcount += 1;
  int m = millis();
  if (m - lastm > 1000 * fint) {
    frate = float(fcount) / fint;
    fcount = 0;
    lastm = m;
    println(“fps: “ + frate); 
  } 
}

void drawParticle(PVector center, float opacity) {
  beginShape(QUAD);
  noStroke();
  tint(255, opacity * 255);
  texture(sprite);
  normal(0, 0, 1);
  vertex(center.x - partSize/2, center.y - partSize/2, 0, 0);
  vertex(center.x + partSize/2, center.y - partSize/2, sprite.width, 0);
  vertex(center.x + partSize/2, center.y + partSize/2, sprite.width, sprite.height);
  vertex(center.x - partSize/2, center.y + partSize/2, 0, sprite.height);                
  endShape();  
}

void initPositions() {
  positions = new PVector[npartTotal];
  for (int n = 0; n < positions.length; n++) {
    positions[n] = new PVector();
  }  
}

void initVelocities() {
  velocities = new PVector[npartTotal];
  for (int n = 0; n < velocities.length; n++) {
    velocities[n] = new PVector();
  }
}

void initLifetimes() {
  // Initializing particles with negative lifetimes so they are added
  // progressively into the screen during the first frames of the sketch   
  lifetimes = new int[npartTotal];
  int t = -1;
  for (int n = 0; n < lifetimes.length; n++) {    
    if (n % npartPerFrame == 0) {
      t++;
    }
    lifetimes[n] = -t;
  }
}

동영상\

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