Lab 5 :: Friendlier Alarm Clock

This alarm clock attempts to improve the experience of 'waking up' every morning. Rather than jolting a person into consciousness, the alarm wakes her up slowly and gradually, by progressively increasing the intensity (brightness and pitch) of its light and sound output. 

 

A photocell in the clock senses ambient light conditions, and the light reading controls the intensity of the alarm sound- in low ambient light conditions (say early dawn), sound is gentler; in higher ambient light conditions (say later in the morning), sound intensity is higher. The intensity also increases proportionately with the increasing illuminance produced by the LEDs in the clock.

 

A force sensor mounted on the top of the clock controls the 'snooze' and 'turn off' functionalities. With a gentle tap, the alarm snoozes. With a more forceful tap, the alarm shuts off.

 

*Delays for the snooze function and increasing LED brightness are scaled down for quicker demo.

 

 

Video

/* Alarm Clock

 * -----------

 * (cleft) 2005 D. Cuartielles for K3

 * Adapted by Ajeeta Dhole on 03/03/13

 */

 

int FSR = 1;    // Select the input pin for the FSR

int photocell = 0;  // Select the input pin for the photocell

int speakerOut = 7;  // Select the output pin for the speaker 

int redLEDPin = 9;   // Select the output pin for the green LED 

int blueLEDPin = 10;  // Select the output pin for the blue LED 

int greenLEDPin = 11;  // Select the output pin for the red LED

 

int FSRval = 0;

int photoVal = 0;

 

byte names[] = {

  'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};  

int tones[] = {

  1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};

byte melody[] = "2d2a1f2c2d2a2d2c2f2d2a2c2d2a1f2c2d2a2a2g2p8p8p8p";

// 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 = 24;

int statePin = LOW;

 

void setup() {

  pinMode(greenLEDPin, OUTPUT);  // declare the greenLEDPin as an OUTPUT

  pinMode(blueLEDPin, OUTPUT);  // declare the blueLEDPin as an OUTPUT

  pinMode(redLEDPin, OUTPUT);  // declare the redLEDPin as an OUTPUT

  pinMode(speakerOut, OUTPUT);

  Serial.begin(9600);

}

 

void loop() {

  for( int i=0; i< 255; i++ ) {  // Increase red pin brightness to 255

    analogWrite(redLEDPin, i);

    delay(30);

    photoVal=analogRead(photocell);

    //Serial.println(photoVal);

  }

  for( int i=0; i<3; i++ ) {

    playMelody(); // Play sound for 3 cycles.

  }

  for( int i=0; i< 255; i++ ) {  // Increase blue pin brightness to 255

    analogWrite(blueLEDPin, i);

    delay(20);

    photoVal=analogRead(photocell);

    //Serial.println(photoVal);

  }

  for( int i=0; i<5; i++ ) {

    playMelody(); // Play sound or 5 cycles.

  }

  for( int i=0; i< 255; i++ ) {  // Increase green pin brightness to 255

    analogWrite(greenLEDPin, i);

    delay(20);

    photoVal=analogRead(photocell);

    //Serial.println(photoVal);

  }

  soundLoop(); // Play sound in loop until snoozed or stopped.

}

 

void playMelody() {

  digitalWrite(speakerOut, LOW);     

    for (count = 0; count < MAX_COUNT; count++) {

      statePin = !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(35000/photoVal);

            digitalWrite(speakerOut, LOW);

            delayMicroseconds(35000/photoVal);} 

          if (melody[count*2 + 1] == 'p') {

          // make a pause of a certain size

            digitalWrite(speakerOut, 0);}

        }

      }

    }

  FSRval = analogRead(FSR);

  Serial.println(FSRval);

}

 

void soundLoop() {

  while (FSRval < 2) { // Plays sound in loop until force is detected.

    playMelody();}

  if (FSRval > 2 && FSRval < 600) {  //Snoozes the alarm. At end of snooze time, starts playing sound in loop until force is detected.

    analogWrite(redLEDPin, 150);

    digitalWrite(greenLEDPin, LOW);

    digitalWrite(blueLEDPin, LOW);

    delay(6000);

    FSRval = 0;

    digitalWrite(redLEDPin, HIGH);

    digitalWrite(greenLEDPin, HIGH);

    digitalWrite(blueLEDPin, HIGH);

    soundLoop();}

  if (FSRval >= 600) { // Shuts off the alarm.

    digitalWrite(redLEDPin,LOW);

    digitalWrite(greenLEDPin,LOW);

    digitalWrite(blueLEDPin,LOW);

    delay(10000000);} // This is a hack. Don't know how to terminate loop(). 'break' doesn't work.

}