Description

A monster helmet that growls at the push of a button.

Components

• Arduino Board
• Piezo speaker
• Red button

Arduino Code

/* A slighly modified version of:
 * Play Melody
 * -----------
 * (cleft) 2005 D. Cuartielles for K3
 */

int ledPin = 11;
int speakerOut = 7;               
byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};  
int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};
//byte melody[] = "2d2a1f2c2d2a2d2c2f2d2a2c2d2a1f2c2d2a2a2g2p8p8p8p";
//byte melody[] = "2c2d2e2a2g2a2c2d2c2f2e2f2e1b1c1d1a1e1d2e2f2e1b1e1a1p1a1p1b1p";
byte melody[] = "1a1p1b1p1a1b1a1b1d1c1p1c1d1c1d1e1p1f1d1e1f1e1f1e1p1e1d1c1b"; //wrote new melody
// count length: 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
//                                10                  20                  30
int count = 0;
int count2 = 0;
int count3 = 0;
int MAX_COUNT = 29;
int statePin = LOW;

void setup() {
 pinMode(ledPin, OUTPUT);
 pinMode(speakerOut, OUTPUT);
}

void loop() {

  for (count = 0; count < MAX_COUNT; count++) {
    statePin = !statePin;
    digitalWrite(ledPin, statePin);
    for (count3 = 0; count3 <= (melody[count*2] - 48) * 30; count3++) {
      for (count2=0;count2<8;count2++) {
        if (names[count2] == melody[count*2 + 1]) {       
          digitalWrite(speakerOut,HIGH);
          delayMicroseconds(random(tones[count2]-20, tones[count2]+20)); //randomized to add growly jitter
          digitalWrite(speakerOut, LOW);
          delayMicroseconds(random(100,2000)); //randomized to add growly jitter
        }
        if (melody[count*2 + 1] == 'p') {
          // make a pause of a certain size
          digitalWrite(speakerOut, 0);
          delayMicroseconds(500);
        }
      }
    }
  }
}

grrr
grrr