// Ahmed and Abigail

​

const int speakerPin = 11;        // the pin that is taking audio signal to speaker

const int potentiometerPin = A0;  // the pin that us

​

int buttonState = 0;

​

const int buttonPin = 9;       // the number of the pin of the button

const int speakerOutPin = 11;  // the number of the pin for the speaker

​

​

void setup() {

  pinMode(2, OUTPUT);  //attach pin 2 to vcc

  pinMode(5, OUTPUT);  //attach pin 5 to GND

  pinMode(speakerPin, OUTPUT);

  // initialize serial communication:

  Serial.begin(9600);

​

  // initialize the pushbutton pin as an input:

  pinMode(buttonPin, INPUT);

}

​

void loop() {

​

  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH) {

​

​

    int potVal = analogRead(potentiometerPin);

    int speakerVal = potVal * 5;

​

    tone(speakerPin, speakerVal);

​

    digitalWrite(2, HIGH);

    // establish variables for duration of the ping,

    // and the distance result in inches and centimeters:

    long durationofSignal, cm;

​

    // The ping is triggered by a HIGH pulse of 2 or more microseconds.

    // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:

    pinMode(3, OUTPUT);  // attach pin 3 to Trig

    digitalWrite(3, LOW);

    delayMicroseconds(2);

    digitalWrite(3, HIGH);

    delayMicroseconds(5);

    digitalWrite(3, LOW);

​

    // The same pin is used to read the signal from the PING))): a HIGH

    // pulse whose duration is the time (in microseconds) from the sending

    // of the ping to the reception of its echo off of an object.

    pinMode(4, INPUT);  //attach pin 4 to Echo

    durationofSignal = pulseIn(4, HIGH);

​

    // convert the time into a distance

​

    cm = microsecondsToCentimeters(durationofSignal);

​

    delay(100);

​

    int toneToPlay = 0;

​

​

    if (cm <= 30 && cm > 25) {

      toneToPlay = 392;

    }

    if (cm <= 20 && cm > 15) {

      toneToPlay = 349;

    }

    if (cm <= 15 && cm > 10) {

      toneToPlay = 329;

    }

    if (cm <= 10 && cm > 5) {

      toneToPlay = 294;

    }

    if (cm <= 5) {

      toneToPlay = 261;

    }

​

    if (toneToPlay == 0) {

      noTone(11);

    } else {

      tone(11, toneToPlay, 200);

    }

​

​

    delay(100);

  } else {

​

    digitalWrite(speakerOutPin, LOW);

  }

}

​

​

long microsecondsToCentimeters(long microseconds) {

  // The speed of sound is 340 m/s or 29 microseconds per centimeter.

  // The ping travels out and back, so to find the distance of the

  // object we take half of the distance travelled.

  return microseconds / 29 / 2;

}