I need a bit of help to add a button to my code

[a_terrible_student]

I don't know how to add a button (to toggle) my code on and off.

here's my code also please tell me how to do it don't just do it for me

/*  RickRollCode

    AUTHOR: Rowan Packard
    rowanpackard@gmail.com

    DISCLAIMER: The song "Never Gonna Give You Up" by Rick Astley
    is not the creative property of the author. This code simply
    plays a Piezo buzzer rendition of the song.
*/

#define  a3f    208     // 208 Hz
#define  b3f    233     // 233 Hz
#define  b3     247     // 247 Hz
#define  c4     261     // 261 Hz MIDDLE C
#define  c4s    277     // 277 Hz
#define  e4f    311     // 311 Hz    
#define  f4     349     // 349 Hz 
#define  a4f    415     // 415 Hz  
#define  b4f    466     // 466 Hz 
#define  b4     493     // 493 Hz 
#define  c5     523     // 523 Hz 
#define  c5s    554     // 554 Hz
#define  e5f    622     // 622 Hz  
#define  f5     698     // 698 Hz 
#define  f5s    740     // 740 Hz
#define  a5f    831     // 831 Hz 

#define rest    -1


int piezo = 7; // Connect your piezo buzzer to this pin or change it to match your circuit!
int led = LED_BUILTIN; 

volatile int beatlength = 100; // determines tempo
float beatseparationconstant = 0.3;

int threshold;

int a; // part index
int b; // song index
int c; // lyric index

boolean flag;

// Parts 1 and 2 (Intro)

int song1_intro_melody[] =
{c5s, e5f, e5f, f5, a5f, f5s, f5, e5f, c5s, e5f, rest, a4f, a4f};

int song1_intro_rhythmn[] =
{6, 10, 6, 6, 1, 1, 1, 1, 6, 10, 4, 2, 10};

// Parts 3 or 5 (Verse 1)

int song1_verse1_melody[] =
{ rest, c4s, c4s, c4s, c4s, e4f, rest, c4, b3f, a3f,
  rest, b3f, b3f, c4, c4s, a3f, a4f, a4f, e4f,
  rest, b3f, b3f, c4, c4s, b3f, c4s, e4f, rest, c4, b3f, b3f, a3f,
  rest, b3f, b3f, c4, c4s, a3f, a3f, e4f, e4f, e4f, f4, e4f,
  c4s, e4f, f4, c4s, e4f, e4f, e4f, f4, e4f, a3f,
  rest, b3f, c4, c4s, a3f, rest, e4f, f4, e4f
};

int song1_verse1_rhythmn[] =
{ 2, 1, 1, 1, 1, 2, 1, 1, 1, 5,
  1, 1, 1, 1, 3, 1, 2, 1, 5,
  1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 3,
  1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 4,
  5, 1, 1, 1, 1, 1, 1, 1, 2, 2,
  2, 1, 1, 1, 3, 1, 1, 1, 3
};

const char* lyrics_verse1[] =
{ "We're ", "no ", "strangers ", "", "to ", "love ", "", "\r\n",
  "You ", "know ", "the ", "rules ", "and ", "so ", "do ", "I\r\n",
  "A ", "full ", "commitment's ", "", "", "what ", "I'm ", "thinking ", "", "of", "\r\n",
  "You ", "wouldn't ", "", "get ", "this ", "from ", "any ", "", "other ", "", "guy\r\n",
  "I ", "just ", "wanna ", "", "tell ", "you ", "how ", "I'm ", "feeling", "\r\n",
  "Gotta ", "", "make ", "you ", "understand", "", "\r\n"
};

// Parts 4 or 6 (Chorus)

int song1_chorus_melody[] =
{ b4f, b4f, a4f, a4f,
  f5, f5, e5f, b4f, b4f, a4f, a4f, e5f, e5f, c5s, c5, b4f,
  c5s, c5s, c5s, c5s,
  c5s, e5f, c5, b4f, a4f, a4f, a4f, e5f, c5s,
  b4f, b4f, a4f, a4f,
  f5, f5, e5f, b4f, b4f, a4f, a4f, a5f, c5, c5s, c5, b4f,
  c5s, c5s, c5s, c5s,
  c5s, e5f, c5, b4f, a4f, rest, a4f, e5f, c5s, rest
};

int song1_chorus_rhythmn[] =
{ 1, 1, 1, 1,
  3, 3, 6, 1, 1, 1, 1, 3, 3, 3, 1, 2,
  1, 1, 1, 1,
  3, 3, 3, 1, 2, 2, 2, 4, 8,
  1, 1, 1, 1,
  3, 3, 6, 1, 1, 1, 1, 3, 3, 3, 1, 2,
  1, 1, 1, 1,
  3, 3, 3, 1, 2, 2, 2, 4, 8, 4
};

const char* lyrics_chorus[] =
{ "Never ", "", "gonna ", "", "give ", "you ", "up\r\n",
  "Never ", "", "gonna ", "", "let ", "you ", "down", "", "\r\n",
  "Never ", "", "gonna ", "", "run ", "around ", "", "", "", "and ", "desert ", "", "you\r\n",
  "Never ", "", "gonna ", "", "make ", "you ", "cry\r\n",
  "Never ", "", "gonna ", "", "say ", "goodbye ", "", "", "\r\n",
  "Never ", "", "gonna ", "", "tell ", "a ", "lie ", "", "", "and ", "hurt ", "you\r\n"
};

void setup()
{
  pinMode(piezo, OUTPUT);
  pinMode(led, OUTPUT);

  digitalWrite(led, LOW);
  Serial.begin(9600);
  flag = true;
  a = 4;
  b = 0;
  c = 0;
}

void loop()
{
  // play next step in song
  if (flag == true) {
    play();
  }
}

void play() {
  int notelength;
  if (a == 1 || a == 2) {
    // intro
    notelength = beatlength * song1_intro_rhythmn[b];
    if (song1_intro_melody[b] > 0) {
      digitalWrite(led, HIGH);
      tone(piezo, song1_intro_melody[b], notelength);
    }
    b++;
    if (b >= sizeof(song1_intro_melody) / sizeof(int)) {
      a++;
      b = 0;
      c = 0;
    }
  }
  else if (a == 3 || a == 5) {
    // verse
    notelength = beatlength * 2 * song1_verse1_rhythmn[b];
    if (song1_verse1_melody[b] > 0) {
      digitalWrite(led, HIGH);
      Serial.print(lyrics_verse1[c]);
      tone(piezo, song1_verse1_melody[b], notelength);
      c++;
    }
    b++;
    if (b >= sizeof(song1_verse1_melody) / sizeof(int)) {
      a++;
      b = 0;
      c = 0;
    }
  }
  else if (a == 4 || a == 6) {
    // chorus
    notelength = beatlength * song1_chorus_rhythmn[b];
    if (song1_chorus_melody[b] > 0) {
      digitalWrite(led, HIGH);
      Serial.print(lyrics_chorus[c]);
      tone(piezo, song1_chorus_melody[b], notelength);
      c++;
    }
    b++;
    if (b >= sizeof(song1_chorus_melody) / sizeof(int)) {
      Serial.println("");
      a++;
      b = 0;
      c = 0;
    }
  }
  delay(notelength);
  noTone(piezo);
  digitalWrite(led, LOW);
  delay(notelength * beatseparationconstant);
  if (a == 7) { // loop back around to beginning of song
    a = 1;
  }
}

(yes I plan to rickroll people)
yes I also did take the code from this legend

https://create.arduino.cc/projecthub/410027/rickroll-piezo-buzzer-a1cd11?f=1#comments

[madmark2150]

It would help if you told us what you wanted the button to DO!

[hannah_mackinlay]

@madmark2150

It would help if you told us what you wanted the button to DO!

Depending on what you actually mean by ...

@a_terrible_student

(to activate) my code

... you could perhaps use that "flag" flag already in the sketch and which afaics never gets set false. Detect the state change of a button and toggle the flag maybe?

This example explains how to detect a button's state change. This is arguably better though in the sense it uses the preferred active low approach.

[StefanL38]

You have to be more precise what "activate my code" means.

As soon as you connect power to your microcontroller "your code" starts running = beeing activated

"activating my code" would mean insert the button into the power-supply so the power-supply is only connected if the button is pressed. or a switch is witched to "ON"-position.

But I guess you mean something different.
For this you should proovide a pure functional description.
pure functional means a description that is a text that describes what a by-standing person can watch if you are interacting with your device.

here is a demo-code that shows how to use a temporary push-button to toggle code-execution

Easy to apply demo-code activate / deactivate code-execution with a momentary push-button used as toggle-switch

Hi everybody, from time to time I enjoy writing demo-codes for a certain functionality. EDIT 04.06.2022 user @dlloyd has written a library with toggle-functionality This means all details how to debounce the button and detecting state-change etc. are hided away from the user inside his library. This makes it easier to apply this functionality but harder to understand. So in post #3 there is a version that makes use of the toogle.h-library. The toogle.h-library can be installed from the li…

best regards Stefan

[a_terrible_student]

yep sorry that I didn't really state what I wanted it to do
what I wanted it to do is start and stop my code when I press the button

[a_terrible_student]

sorry for the misunderstanding what you said is what I want it to do which is toggle the code on and off ill check out the code once I have the class again thanks