Halloween "Noisy" Skull

  // Global constants of frienly names
  const int inPIR = 3; //PIR people detector
  const int rLED = 4; //Red LED
  const int gLED = 5; //Green LED
  const int bLED = 2; //Blue LED
  const int pBright = 1; //PWM for LED brightness control
  const int pAudio = 0; //PWM for audio Fx generation

  // Global variables
  int colorLED = 0;

// the setup routine runs once when you press reset:
void setup() {                
  
  // initialize the digital pins as an input.
  pinMode(inPIR, INPUT); //PIR signal input
  randomSeed(analogRead(inPIR)); 
  
  // initialize the digital pins as an output and set state.
  pinMode(pAudio, OUTPUT); //PWM audio to low pass filter 
  pinMode(pBright, OUTPUT); //PWM "eye" brightness
  pinMode(bLED, OUTPUT); //Blue LED  
  pinMode(gLED, OUTPUT); //Green LED   
  pinMode(rLED, OUTPUT); //Red LED
  digitalWrite(pAudio,LOW); //Turn off audio

  // initialize circuits to show "it's alive!"
  digitalWrite(pBright,HIGH);
  digitalWrite(bLED,HIGH); //Turn on Blue LED
  delay(1000);
  digitalWrite(bLED,LOW); //Turn off Blue LED
  digitalWrite(rLED,HIGH); //Turn on Red LED
  delay(1000);
  digitalWrite(rLED,HIGH); //Turn off Red LED
  digitalWrite(gLED,HIGH); //Turn on Green LED
  delay(1000);
  digitalWrite(gLED, LOW);  //Turn off green LED
  digitalWrite(pBright,LOW);
}

// the loop routine runs over and over again forever:
void loop() {
  do
  {
    delay(50);
 } while (analogRead(inPIR)<600);
  makeNoise;
}

void ledRamp() {
  digitalWrite(pBright,LOW);
  for (int j = 0; j = 255; j++) {
    analogWrite(pBright, j);
    delay(20);
  }
  for (int j = 255; j = 0; j--) {
    analogWrite(pBright, j);
    delay(20);
  }
  digitalWrite(pBright,LOW);
}

void makeNoise() {
  //Blink eyes
  doEyes;
  doSound;
  delay(1000);
}

void doEyes() {
  colorLED = random(0, 6);
  digitalWrite(pBright,HIGH);
  if (colorLED = 0)
  {
    digitalWrite(rLED,HIGH); //Turn on Red LED
    digitalWrite(bLED,LOW); 
    digitalWrite(gLED,LOW);      
  }
  else if (colorLED = 1)
  {
    digitalWrite(gLED,HIGH); //Turn on Green LED 
    digitalWrite(rLED,LOW);   
    digitalWrite(bLED,LOW);  
  }
  else if (colorLED = 2)
  {
    digitalWrite(bLED,HIGH); //Turn on Blue LED
    digitalWrite(gLED,LOW); 
    digitalWrite(rLED,LOW);          
  }
  else if (colorLED = 3)
  {
    digitalWrite(rLED,HIGH);   
    digitalWrite(bLED,HIGH);  
    digitalWrite(gLED,LOW); 
  }
  else if (colorLED = 4)
  {
    digitalWrite(bLED,HIGH); 
    digitalWrite(gLED,HIGH);      
    digitalWrite(rLED,LOW);          
  }
  else if (colorLED = 5)
  {
    digitalWrite(gLED,HIGH); 
    digitalWrite(rLED,HIGH);          
    digitalWrite(bLED,LOW);  
  }
  digitalWrite(pBright,LOW);
}

void doSound() {
  for (int j = 80; j>2000; j = j+10) {
    analogWrite(pAudio, j);
    delay(10);
  }
  for (int j = 2000; j<80; j = j-10) {
    analogWrite(pAudio, j);
  }
  digitalWrite(pAudio, LOW);
}