How do I make my piezo buzzer only hum once without repetition?

Question

I have a problem with getting my buzzer to only do the tones I programmed in once. I know I have to add some sort of code but I'm relatively new to this so I don't really know. I want it to start playing the tones I have in the code once I press the button. After that it should immediately stop, without looping everything until I press the button again. Basically I have these LEDs that light up in a row with every time I press my button and once the last LED lights up, the buzzer should play its melody. After that, I can press my button again and the whole thing starts from the beginning. If anyone could help, I'd be more than grateful!

This is my code:

#define button 3

#define LED 1
#define twoLED 2
#define threeLED 4
#define fourLED 5
#define fiveLED 6
#define sixLED 7
#define sevenLED 8
#define eightLED 9
#define nineLED 10
#define tenLED 11




int state = 0;
int old = 0;
int buttonPoll = 0;

void setup() {
  pinMode (3,INPUT);
  pinMode (11,OUTPUT);
  pinMode(LED, OUTPUT);
  pinMode(twoLED, OUTPUT);
  pinMode(threeLED, OUTPUT);
  pinMode(fourLED, OUTPUT);
  pinMode(fiveLED, OUTPUT);
  pinMode(sixLED, OUTPUT);
  pinMode(sevenLED, OUTPUT);
  pinMode(eightLED, OUTPUT);
  pinMode(nineLED, OUTPUT);
  pinMode(tenLED, OUTPUT);
  

  digitalWrite(LED, LOW);
  digitalWrite(twoLED,LOW);
  digitalWrite(threeLED,LOW);
  digitalWrite(fourLED, LOW);
  digitalWrite(fiveLED, LOW);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
  
}

void loop() {


  buttonPoll = digitalRead (3);
  if (buttonPoll ==1) {
    delay (50);
    buttonPoll = digitalRead (3);
    if (buttonPoll == 0) {
      state = old + 1;
    }
  }
  else {
    delay(100);
    
  }

  switch (state) {
    case 1:
  digitalWrite(LED, HIGH);
  digitalWrite(twoLED,LOW);
  digitalWrite(threeLED,LOW);
  digitalWrite(fourLED, LOW);
  digitalWrite(fiveLED, LOW);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
    old = state;
    break;
    
    case 2:
  digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,LOW);
  digitalWrite(fourLED, LOW);
  digitalWrite(fiveLED, LOW);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
    old = state;
    break;
    
    case 3:
  digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, LOW);
  digitalWrite(fiveLED, LOW);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
    old = state;
    break;

    case 4:
  digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, HIGH);
  digitalWrite(fiveLED, LOW);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
   old = state;
    break;

  case 5:
    digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, HIGH);
  digitalWrite(fiveLED, HIGH);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
   old = state;
    break;

  case 6:
    digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, HIGH);
  digitalWrite(fiveLED, HIGH);
  digitalWrite(sixLED, HIGH);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
   old = state;
    break;

  case 7:
    digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, HIGH);
  digitalWrite(fiveLED, HIGH);
  digitalWrite(sixLED, HIGH);
  digitalWrite(sevenLED, HIGH);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
   old = state;
    break;

  case 8:
    digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, HIGH);
  digitalWrite(fiveLED, HIGH);
  digitalWrite(sixLED, HIGH);
  digitalWrite(sevenLED, HIGH);
  digitalWrite(eightLED, HIGH);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
   old = state;
    break;

  case 9:
    digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, HIGH);
  digitalWrite(fiveLED, HIGH);
  digitalWrite(sixLED, HIGH);
  digitalWrite(sevenLED, HIGH);
  digitalWrite(eightLED, HIGH);
  digitalWrite(nineLED, HIGH);
  digitalWrite(tenLED, LOW);
   old = state;
    break;

  case 10:
    digitalWrite(LED, HIGH);
  digitalWrite(twoLED,HIGH);
  digitalWrite(threeLED,HIGH);
  digitalWrite(fourLED, HIGH);
  digitalWrite(fiveLED, HIGH);
  digitalWrite(sixLED, HIGH);
  digitalWrite(sevenLED, HIGH);
  digitalWrite(eightLED, HIGH);
  digitalWrite(nineLED, HIGH);
  digitalWrite(tenLED, HIGH);
   old = state;


       tone (11,261);
      delay(250);
      
      tone(11, 330);
      delay(250);
      
      tone(11,391.99);
      delay(250);

      tone(11,440);
      delay(250);

      tone(11, 391.995);
      delay(250);

      tone(11, 330);
      delay(250);

        }
      
    break;

   default:
  digitalWrite(LED, LOW);
  digitalWrite(twoLED,LOW);
  digitalWrite(threeLED,LOW);
  digitalWrite(fourLED, LOW);
  digitalWrite(fiveLED, LOW);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);
  
    old = 0;

    break;


  }
}

CharlieHanson · Accepted Answer · 2021-04-27 13:14:53Z

0

Enshrine the first section of the loop() code inside a while loop.

while (condition)
{
    // this code executes continually until 'condition' is true
}

In your case, the variable state changes when an active button press is recorded: use that as your condition.

while (state == old)
{
  buttonPoll = digitalRead (3);
  if (buttonPoll ==1)
  {
    delay (50);
    buttonPoll = digitalRead (3);
    if (buttonPoll == 0)
    {
      state = old + 1;
    }
  }
  else
  {
    delay(100);   
  }
}

So long as state stays the same, i.e. it equals old, the code within the while loop will execute indefinitely. NOTE: Any code outside the while loop will effectively only run once. You may find, if you expand the code, most of it lives within the while loop. If that is the case there may be better approach to consider.

answered Apr 27, 2021 at 13:14

CharlieHanson

1,4101 gold badge11 silver badges25 bronze badges

Thanks so much for your help! I really appreciate it!
– Éemia
Commented Apr 27, 2021 at 14:25
I'm so glad you took the effort to answer me. Unfortunately, I've tried it out and the outcome was the same as before. Thanks anyways though!
– Éemia
Commented Apr 27, 2021 at 14:46
Oh! You forgot to add noTone(11); at the end of the different tones! You will also need to reset state to zero when you reset old to zero, otherwise you will get stuck in an infinite loop.
– CharlieHanson
Commented Apr 27, 2021 at 20:03
Oh my gosh thank you so much!!! You have no idea how much you've helped me! I am so grateful for your help.
– Éemia
Commented Apr 28, 2021 at 7:32

Add a comment |

JRobert · Accepted Answer · 2021-04-27 13:20:08Z

0

Once the LEDs & Piezo sequence finishes, your code doesn't wait for the button to be pressed again. If the button is not pressed, the code doesn't wait, it merely delays for 100ms, then repeats the sequence.

answered Apr 27, 2021 at 13:20

JRobert

15.3k3 gold badges23 silver badges51 bronze badges

Add a comment |

ArduinoFan · Accepted Answer · 2021-05-04 11:18:47Z

Welcome to ASE :)

You have mapped the Tone function and the LED to the same Pins. So, you may have to find another pin for the buzzer (pin 0 )
I have taken code from @charlieHanson as well.
The braces for the switch statement were put in the wrong place. I have fixed it.

Have a try: The code is here

#define button 3

#define LED 1
#define twoLED 2
#define threeLED 4
#define fourLED 5
#define fiveLED 6
#define sixLED 7
#define sevenLED 8
#define eightLED 9
#define nineLED 10
#define tenLED 11




int state = 0;
int old = 0;
int buttonPoll = 0;

void setup() {
  pinMode (3, INPUT_PULLUP);
  pinMode (11, OUTPUT);
  pinMode(LED, OUTPUT);
  pinMode(twoLED, OUTPUT);
  pinMode(threeLED, OUTPUT);
  pinMode(fourLED, OUTPUT);
  pinMode(fiveLED, OUTPUT);
  pinMode(sixLED, OUTPUT);
  pinMode(sevenLED, OUTPUT);
  pinMode(eightLED, OUTPUT);
  pinMode(nineLED, OUTPUT);
  pinMode(tenLED, OUTPUT);


  digitalWrite(LED, LOW);
  digitalWrite(twoLED, LOW);
  digitalWrite(threeLED, LOW);
  digitalWrite(fourLED, LOW);
  digitalWrite(fiveLED, LOW);
  digitalWrite(sixLED, LOW);
  digitalWrite(sevenLED, LOW);
  digitalWrite(eightLED, LOW);
  digitalWrite(nineLED, LOW);
  digitalWrite(tenLED, LOW);

}

void loop() {



  while (state == old)
  {
    buttonPoll = digitalRead (3);
    if (buttonPoll == 1)
    {
      delay (50);
      buttonPoll = digitalRead (3);
      if (buttonPoll == 0)
      {
        state = old + 1;
      }
    }
    else
    {
      delay(100);
    }
  }

  switch (state) {
    case 1:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, LOW);
      digitalWrite(threeLED, LOW);
      digitalWrite(fourLED, LOW);
      digitalWrite(fiveLED, LOW);
      digitalWrite(sixLED, LOW);
      digitalWrite(sevenLED, LOW);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 2:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, LOW);
      digitalWrite(fourLED, LOW);
      digitalWrite(fiveLED, LOW);
      digitalWrite(sixLED, LOW);
      digitalWrite(sevenLED, LOW);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 3:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, LOW);
      digitalWrite(fiveLED, LOW);
      digitalWrite(sixLED, LOW);
      digitalWrite(sevenLED, LOW);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 4:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, HIGH);
      digitalWrite(fiveLED, LOW);
      digitalWrite(sixLED, LOW);
      digitalWrite(sevenLED, LOW);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 5:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, HIGH);
      digitalWrite(fiveLED, HIGH);
      digitalWrite(sixLED, LOW);
      digitalWrite(sevenLED, LOW);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 6:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, HIGH);
      digitalWrite(fiveLED, HIGH);
      digitalWrite(sixLED, HIGH);
      digitalWrite(sevenLED, LOW);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 7:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, HIGH);
      digitalWrite(fiveLED, HIGH);
      digitalWrite(sixLED, HIGH);
      digitalWrite(sevenLED, HIGH);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 8:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, HIGH);
      digitalWrite(fiveLED, HIGH);
      digitalWrite(sixLED, HIGH);
      digitalWrite(sevenLED, HIGH);
      digitalWrite(eightLED, HIGH);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 9:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, HIGH);
      digitalWrite(fiveLED, HIGH);
      digitalWrite(sixLED, HIGH);
      digitalWrite(sevenLED, HIGH);
      digitalWrite(eightLED, HIGH);
      digitalWrite(nineLED, HIGH);
      digitalWrite(tenLED, LOW);
      old = state;
      break;

    case 10:
      digitalWrite(LED, HIGH);
      digitalWrite(twoLED, HIGH);
      digitalWrite(threeLED, HIGH);
      digitalWrite(fourLED, HIGH);
      digitalWrite(fiveLED, HIGH);
      digitalWrite(sixLED, HIGH);
      digitalWrite(sevenLED, HIGH);
      digitalWrite(eightLED, HIGH);
      digitalWrite(nineLED, HIGH);
      digitalWrite(tenLED, HIGH);
      old = 0;
      state = 0;


      tone (11, 261);
      delay(250);

      tone(11, 330);
      delay(250);

      tone(11, 391.99);
      delay(250);

      tone(11, 440);
      delay(250);

      tone(11, 391.995);
      delay(250);

      tone(11, 330);
      delay(250);
      noTone(11);


      break;

    default:
      digitalWrite(LED, LOW);
      digitalWrite(twoLED, LOW);
      digitalWrite(threeLED, LOW);
      digitalWrite(fourLED, LOW);
      digitalWrite(fiveLED, LOW);
      digitalWrite(sixLED, LOW);
      digitalWrite(sevenLED, LOW);
      digitalWrite(eightLED, LOW);
      digitalWrite(nineLED, LOW);
      digitalWrite(tenLED, LOW);

      old = 0;

      break;

  }
}

Here is the preview :)

Here is the Arduino simulator link: https://wokwi.com/arduino/projects/297098737606459913

Wow, thanks so much!!!
– Éemia
Commented Apr 29, 2021 at 18:08 — Éemia, Commented Apr 29, 2021 at 18:08

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