photo-buzzer-button-servo.ino

/*
  Scholars' Lab Arduino Tutorials
  Example Sketch 10

  PHOTORESISTOR -> BUZZER & BUTTON -> SERVO

  Pushing a button causes the servo motor to rotate 180 then back.
  Amount of light triggers playing a tune on the buzzer.

  This sketch uses code from SparkFun SIK version 3.3,
  from experiments 5, 6, 8, and 11
  This code is completely free for any use.
  Visit https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino---v33/ for SIK information.
  Visit http://www.arduino.cc to learn about the Arduino.

  Version 1.0/2022 AES
*/

/**************************************************
   SERVO CODE
*/
// Include the Servo library
#include <Servo.h>

// Create constants for setting pins.
const int sensorPin = 0;
const int servoPin = 9;
// Create servo control object
Servo servo;
/**************************************************/



/**************************************************
   BUZZER CODE
*/
const int buzzerPin = 12;
const int songLength = 18;

char notes[songLength] =
{'c', 'd', 'f', 'd', 'a', ' ', 'a', 'g', ' ', 'c', 'd', 'f', 'd', 'g', ' ', 'g', 'f', ' '};

int beats[songLength] = {1, 1, 1, 1, 1, 1, 4, 4, 2, 1, 1, 1, 1, 1, 1, 4, 4, 2};

int tempo = 113;
/****************************************************/




/*****************************************************
   PHOTORESISTOR CODE
*/
// Set some contstants. Set the low at the highest value, it will auto adjust.
// Set the high at the lowest, it will also auto adjust.
int lightlevel, low = 1023, high = 0;
/* Change tripPoint value to increase or decrease the sensitivity. 
 * View the values produced by the photoresistor (Serial.println) 
 * to see what the high and low values will be. Set this about 100 
 * more than the low value.
 */
int tripPoint = 400;
/******************************************************/




/*****************************************************
   BUTTON CODE
*/
int buttonPin = 2;
int buttonState;
/*****************************************************/



void setup() {
  // set the servo pin
  servo.attach(servoPin);
  servo.write(0); // servo should be at 0 to start

  // set the buzzer pin
  pinMode(buzzerPin, OUTPUT);

  // set the button pin
  pinMode(buttonPin, INPUT);

  // Uncomment line below to allow for serial output - reading the sensor data
  Serial.begin(9600);

}


void loop() {
  /**************************************
     BUTTON AND SERVO CODE
  */
  buttonState = digitalRead(buttonPin);

  // if the button is pressed, move the servo to angle 180
  // if not, angle is 0
  if (buttonState == LOW) {
    servo.write(180);
  } else {
    servo.write(0);
  }
  /*************************************/





  /*********************************
     LIGHT AND BUZZER CODE
  */
  lightlevel = analogRead(sensorPin);

  Serial.println(lightlevel);

  if (lightlevel < tripPoint) {
    playBuzzer(); // this function created below
  }
  /********************************/

}



void playBuzzer()
{
  int i, duration; //

  for (i = 0; i < songLength; i++) // for loop is used to index through the arrays
  {
    duration = beats[i] * tempo;  // length of note/rest in ms

    if (notes[i] == ' ')          // is this a rest?
      delay(duration);            // then pause for a moment
    else                          // otherwise, play the note
    {
      tone(buzzerPin, frequency(notes[i]), duration);
      delay(duration);            // wait for tone to finish
    }
    delay(tempo / 10);            // brief pause between notes
  }

}

int frequency(char note)
{
  int i;
  const int numNotes = 8;  // number of notes we're storing
  char names[numNotes] = {
    'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'
  };
  int frequencies[numNotes] = {
    262, 294, 330, 349, 392, 440, 494, 523
  };

  // Now we'll search through the letters in the array, and if
  // we find it, we'll return the frequency for that note.

  for (i = 0; i < numNotes; i++)  // Step through the notes
  {
    if (names[i] == note)         // Is this the one?
    {
      return (frequencies[i]);    // Yes! Return the frequency and exit function.
    }
  }
  return (0); // We looked through everything and didn't find it,
  // but we still need to return a value, so return 0.
}