Published January 28, 2020 © GPL3+
6 Player Buzzer-Game

Never have trouble again deciding who is allowed to answer a quiz question. 6 different LED's show who pressed his buzzer first.
BeginnerShowcase (no instructions)5,404
Things used in this project

Hardware components

Arduino Nano R3
Pushbutton Switch, Momentary
Rotary potentiometer (generic)
LED (generic)
Resistors
wooden box
USB-A to Mini-USB Cable
DC Power Connector, Socket
dc Cable
Software apps and online services

Arduino IDE
Hand tools and fabrication machines

Drill, Screwdriver
Soldering iron (generic)
Solder Wire, Lead Free
Story

My friends and me love to play quiz games. The problem was that we never knew who answered first. The game box uses LEDs and six different sound effects to identify who pushed their buzzer first. Also, there is a potentiometer that allows to adjust the time that players are able to answer their question.
Code

Code for 6 player buzzer game
const int S1LED =  A0;
const int S2LED =  A1;
const int S3LED =  A2;
const int S4LED =  A3;
const int S5LED =  A4;
const int S6LED =  A5;
const int S1TASTER = 8;
const int S2TASTER = 11;
const int S3TASTER = 10;
const int S4TASTER = 12;
const int S5TASTER = 9;
const int S6TASTER = 7;
const int Buzzer = 13;
const int potPin = A7;
int switchStateS1 = 0;
int switchStateS2 = 0;
int switchStateS3 = 0;
int switchStateS4 = 0;
int switchStateS5 = 0;
int switchStateS6 = 0;
int potVal;
int Dauer;
int dauerGesamt;
#include "pitches.h"
void setup() {
  /*Serial.begin(9600);*/
  pinMode(S1LED, OUTPUT);
  pinMode(S2LED, OUTPUT);
  pinMode(S3LED, OUTPUT);
  pinMode(S4LED, OUTPUT);
  pinMode(S5LED, OUTPUT);
  pinMode(S6LED, OUTPUT);

  digitalWrite(S1LED, HIGH);
  delay(30);
  digitalWrite(S2LED, HIGH);
  delay(30);
  digitalWrite(S3LED, HIGH);
  delay(30);
  digitalWrite(S4LED, HIGH);
  delay(30);
  digitalWrite(S5LED, HIGH);
  delay(30);
  digitalWrite(S6LED, HIGH);
  delay(30);
  digitalWrite(S1LED, LOW);
  delay(30);
  digitalWrite(S2LED, LOW);
  delay(30);
  digitalWrite(S3LED, LOW);
  delay(30);
  digitalWrite(S4LED, LOW);
  delay(30);
  digitalWrite(S5LED, LOW);
  delay(30);
  digitalWrite(S6LED, LOW);
  delay(30);
  digitalWrite(S1LED, HIGH);
  delay(30);
  digitalWrite(S2LED, HIGH);
  delay(30);
  digitalWrite(S3LED, HIGH);
  delay(30);
  digitalWrite(S4LED, HIGH);
  delay(30);
  digitalWrite(S5LED, HIGH);
  delay(30);
  digitalWrite(S6LED, HIGH);
  delay(30);
  digitalWrite(S1LED, LOW);
  delay(30);
  digitalWrite(S2LED, LOW);
  delay(30);
  digitalWrite(S3LED, LOW);
  delay(30);
  digitalWrite(S4LED, LOW);
  delay(30);
  digitalWrite(S5LED, LOW);
  delay(30);
  digitalWrite(S6LED, LOW);
  delay(30);
  tone(Buzzer, NOTE_F3, 200);
  delay(200);
  tone(Buzzer, NOTE_A3, 200);
  delay(400);
  tone(Buzzer, NOTE_F3, 200);
  delay(200);
  tone(Buzzer, NOTE_AS3, 200);
  delay(400);
  tone(Buzzer, NOTE_F3, 200);
  delay(200);
  tone(Buzzer, NOTE_C4, 800);
  delay(800);



  noTone(Buzzer);
}

void loop() {
Start:
  int dauerSchluss = 3;
  int i = 0;
  potVal = analogRead(potPin);
  Dauer = map(potVal, 0, 1023, 0, 7);

  switchStateS1 = digitalRead(S1TASTER);
  switchStateS2 = digitalRead(S2TASTER);
  switchStateS3 = digitalRead(S3TASTER);
  switchStateS4 = digitalRead(S4TASTER);
  switchStateS5 = digitalRead(S5TASTER);
  switchStateS6 = digitalRead(S6TASTER);
  /*
    Serial.print(potVal);
    Serial.print(" ");
    Serial.print(Dauer);
    Serial.print(" ");
    Serial.print(switchStateS1);
    Serial.print(switchStateS2);
    Serial.print(switchStateS3);
    Serial.print(switchStateS4);
    Serial.print(switchStateS5);
    Serial.print(switchStateS6);*/


  pinMode(S1TASTER, INPUT);
  pinMode(S2TASTER, INPUT);
  pinMode(S3TASTER, INPUT);
  pinMode(S4TASTER, INPUT);
  pinMode(S5TASTER, INPUT);
  pinMode(S6TASTER, INPUT);
  if (Dauer == 1) {
    dauerGesamt = 3;
  }
  else if (Dauer == 2) {
    dauerGesamt = 5;
  }
  else if (Dauer == 3) {
    dauerGesamt = 10;
  }
  else if (Dauer == 4) {
    dauerGesamt = 20;
  }
  else if (Dauer == 5) {
    dauerGesamt = 30;
  }
  else if (Dauer == 6 or Dauer == 7) {
    dauerGesamt = 60;
  }
  else {
    dauerGesamt = 3;
  }
  /*Serial.print(" ");
    Serial.println(dauerGesamt);*/
  if (Dauer != 0) {
    //Spieler 1
    if (switchStateS1 == HIGH) {
      //Ton bei Druck
      digitalWrite(S1LED, HIGH);
      tone(Buzzer, NOTE_G4, 35);
      delay(35);
      tone(Buzzer, NOTE_G5, 35);
      delay(35);
      tone(Buzzer, NOTE_G6, 35);
      delay(35);
      noTone(Buzzer);
      //Warten
      delay((dauerGesamt + 1 - dauerSchluss - 0.21) * 900);
      digitalWrite(S1LED, LOW);
      //Ende
      delay((dauerGesamt + 1 - dauerSchluss - 0.21) * 100);
      while (i < dauerSchluss - 1) {
        tone(Buzzer, NOTE_G4);
        digitalWrite(S1LED, HIGH);
        digitalWrite(S2LED, HIGH);
        digitalWrite(S3LED, HIGH);
        digitalWrite(S4LED, HIGH);
        digitalWrite(S5LED, HIGH);
        digitalWrite(S6LED, HIGH);
        delay(500);
        digitalWrite(S2LED, LOW);
        digitalWrite(S3LED, LOW);
        digitalWrite(S4LED, LOW);
        digitalWrite(S5LED, LOW);
        digitalWrite(S6LED, LOW);
        noTone(Buzzer);
        delay(500);
        i++;
      }
      digitalWrite(S1LED, HIGH);
      digitalWrite(S2LED, HIGH);
      digitalWrite(S3LED, HIGH);
      digitalWrite(S4LED, HIGH);
      digitalWrite(S5LED, HIGH);
      digitalWrite(S6LED, HIGH);
      tone(Buzzer, NOTE_G5);
      delay(500);
      digitalWrite(S1LED, LOW);
      digitalWrite(S2LED, LOW);
      digitalWrite(S3LED, LOW);
      digitalWrite(S4LED, LOW);
      digitalWrite(S5LED, LOW);
      digitalWrite(S6LED, LOW);
      noTone(Buzzer);
      digitalWrite(S1LED, HIGH);
      delay(30);
      digitalWrite(S2LED, HIGH);
      delay(30);
      digitalWrite(S3LED, HIGH);
      delay(30);
      digitalWrite(S4LED, HIGH);
      delay(30);
      digitalWrite(S5LED, HIGH);
      delay(30);
      digitalWrite(S6LED, HIGH);
      delay(30);
      digitalWrite(S1LED, LOW);
      delay(30);
      digitalWrite(S2LED, LOW);
      delay(30);
      digitalWrite(S3LED, LOW);
      delay(30);
      digitalWrite(S4LED, LOW);
      delay(30);
      digitalWrite(S5LED, LOW);
      delay(30);
      digitalWrite(S6LED, LOW);
      delay(30);
      goto Start;
    }

    //Spieler 2
    if (switchStateS2 == HIGH) {
      digitalWrite(S2LED, HIGH);
      //Ton bei Druck
      tone(Buzzer, NOTE_B5, 100);
      delay(100);
      tone(Buzzer, NOTE_E6, 700);
      delay(700);
      noTone(Buzzer);
      //Warten
      delay((dauerGesamt + 1 - dauerSchluss - 0.8) * 900);
      digitalWrite(S2LED, LOW);
      //Ende
      delay((dauerGesamt + 1 - dauerSchluss - 0.8) * 100);
      while (i < dauerSchluss - 1) {
        tone(Buzzer, NOTE_G4);
        digitalWrite(S1LED, HIGH);
        digitalWrite(S2LED, HIGH);
        digitalWrite(S3LED, HIGH);
        digitalWrite(S4LED, HIGH);
        digitalWrite(S5LED, HIGH);
        digitalWrite(S6LED, HIGH);
        delay(500);
        digitalWrite(S1LED, LOW);
        digitalWrite(S3LED, LOW);
        digitalWrite(S4LED, LOW);
        digitalWrite(S5LED, LOW);
        digitalWrite(S6LED, LOW);
        noTone(Buzzer);
        delay(500);
        i++;
      }
      digitalWrite(S1LED, HIGH);
      digitalWrite(S2LED, HIGH);
      digitalWrite(S3LED, HIGH);
      digitalWrite(S4LED, HIGH);
      digitalWrite(S5LED, HIGH);
      digitalWrite(S6LED, HIGH);
      tone(Buzzer, NOTE_G5);
      delay(500);
      digitalWrite(S1LED, LOW);
      digitalWrite(S2LED, LOW);
      digitalWrite(S3LED, LOW);
      digitalWrite(S4LED, LOW);
      digitalWrite(S5LED, LOW);
      digitalWrite(S6LED, LOW);
      noTone(Buzzer);
      digitalWrite(S2LED, HIGH);
      delay(30);
      digitalWrite(S3LED, HIGH);
      delay(30);
      digitalWrite(S4LED, HIGH);
      delay(30);
      digitalWrite(S5LED, HIGH);
      delay(30);
      digitalWrite(S6LED, HIGH);
      delay(30);
      digitalWrite(S1LED, HIGH);
      delay(30);
      digitalWrite(S2LED, LOW);
      delay(30);
      digitalWrite(S3LED, LOW);
      delay(30);
      digitalWrite(S4LED, LOW);
      delay(30);
      digitalWrite(S5LED, LOW);
      delay(30);
      digitalWrite(S6LED, LOW);
      delay(30);
      digitalWrite(S1LED, LOW);
      goto Start;
    }


    //Spieler 3
    if (switchStateS3 == HIGH) {
      digitalWrite(S3LED, HIGH);
      for (int hz = 2000; hz > 440; hz--) {
        tone(Buzzer, hz, 50);
        delay(0.5);
      }

      //Warten
      delay((dauerGesamt + 1 - dauerSchluss - 0.4) * 900);
      digitalWrite(S3LED, LOW);
      //Ende
      delay((dauerGesamt + 1 - dauerSchluss - 0.4) * 100);
      while (i < dauerSchluss - 1) {
        tone(Buzzer, NOTE_G4);
        digitalWrite(S1LED, HIGH);
        digitalWrite(S2LED, HIGH);
        digitalWrite(S3LED, HIGH);
        digitalWrite(S4LED, HIGH);
        digitalWrite(S5LED, HIGH);
        digitalWrite(S6LED, HIGH);
        delay(500);
        digitalWrite(S1LED, LOW);
        digitalWrite(S2LED, LOW);
        digitalWrite(S4LED, LOW);
        digitalWrite(S5LED, LOW);
        digitalWrite(S6LED, LOW);
        noTone(Buzzer);
        delay(500);
        i++;
      }
      digitalWrite(S1LED, HIGH);
      digitalWrite(S2LED, HIGH);
      digitalWrite(S3LED, HIGH);
      digitalWrite(S4LED, HIGH);
      digitalWrite(S5LED, HIGH);
      digitalWrite(S6LED, HIGH);
      tone(Buzzer, NOTE_G5);
      delay(500);
      digitalWrite(S1LED, LOW);
      digitalWrite(S2LED, LOW);
      digitalWrite(S3LED, LOW);
      digitalWrite(S4LED, LOW);
      digitalWrite(S5LED, LOW);
      digitalWrite(S6LED, LOW);
      noTone(Buzzer);
      digitalWrite(S3LED, HIGH);
      delay(30);
      digitalWrite(S4LED, HIGH);
      delay(30);
      digitalWrite(S5LED, HIGH);
      delay(30);
      digitalWrite(S6LED, HIGH);
      delay(30);
      digitalWrite(S1LED, HIGH);
      delay(30);
      digitalWrite(S2LED, HIGH);
      delay(30);
      digitalWrite(S3LED, LOW);
      delay(30);
      digitalWrite(S4LED, LOW);
      delay(30);
      digitalWrite(S5LED, LOW);
      delay(30);
      digitalWrite(S6LED, LOW);
      delay(30);
      digitalWrite(S1LED, LOW);
      delay(30);
      digitalWrite(S2LED, LOW);
      goto Start;
    }


    //Spieler 4
    if (switchStateS4 == HIGH) {
      digitalWrite(S4LED, HIGH);
      tone(Buzzer, NOTE_C7, 115);
      delay(125);
      tone(Buzzer, NOTE_C7, 240);
      delay(250);
      tone(Buzzer, NOTE_C7, 240);
      delay(250);
      tone(Buzzer, NOTE_GS6, 115);
      delay(125);
      tone(Buzzer, NOTE_C7, 240);
      delay(250);
      tone(Buzzer, NOTE_DS7, 115);
      delay(125);
      //Warten
      delay((dauerGesamt + 1 - dauerSchluss - 1.0) * 900);
      digitalWrite(S4LED, LOW);
      //Ende
      delay((dauerGesamt + 1 - dauerSchluss - 1.0) * 100);
      while (i < dauerSchluss - 1) {
        tone(Buzzer, NOTE_G4);
        digitalWrite(S1LED, HIGH);
        digitalWrite(S2LED, HIGH);
        digitalWrite(S3LED, HIGH);
        digitalWrite(S4LED, HIGH);
        digitalWrite(S5LED, HIGH);
        digitalWrite(S6LED, HIGH);
        delay(500);
        digitalWrite(S1LED, LOW);
        digitalWrite(S2LED, LOW);
        digitalWrite(S3LED, LOW);
        digitalWrite(S5LED, LOW);
        digitalWrite(S6LED, LOW);
        noTone(Buzzer);
        delay(500);
        i++;
      }
      digitalWrite(S1LED, HIGH);
      digitalWrite(S2LED, HIGH);
      digitalWrite(S3LED, HIGH);
      digitalWrite(S4LED, HIGH);
      digitalWrite(S5LED, HIGH);
      digitalWrite(S6LED, HIGH);
      tone(Buzzer, NOTE_G5);
      delay(500);
      digitalWrite(S1LED, LOW);
      digitalWrite(S2LED, LOW);
      digitalWrite(S3LED, LOW);
      digitalWrite(S4LED, LOW);
      digitalWrite(S5LED, LOW);
      digitalWrite(S6LED, LOW);
      noTone(Buzzer);
      digitalWrite(S4LED, HIGH);
      delay(30);
      digitalWrite(S5LED, HIGH);
      delay(30);
      digitalWrite(S6LED, HIGH);
      delay(30);
      digitalWrite(S1LED, HIGH);
      delay(30);
      digitalWrite(S2LED, HIGH);
      delay(30);
      digitalWrite(S3LED, HIGH);
      delay(30);
      digitalWrite(S4LED, LOW);
      delay(30);
      digitalWrite(S5LED, LOW);
      delay(30);
      digitalWrite(S6LED, LOW);
      delay(30);
      digitalWrite(S1LED, LOW);
      delay(30);
      digitalWrite(S2LED, LOW);
      delay(30);
      digitalWrite(S3LED, LOW);
      goto Start;
    }



    //Spieler 5
    if (switchStateS5 == HIGH) {
      digitalWrite(S5LED, HIGH);
      tone(Buzzer, NOTE_E6, 125);
      delay(125);
      tone(Buzzer, NOTE_G6, 125);
      delay(125);
      tone(Buzzer, NOTE_E7, 125);
      delay(125);
      tone(Buzzer, NOTE_C7, 125);
      delay(125);
      tone(Buzzer, NOTE_D7, 125);
      delay(125);
      tone(Buzzer, NOTE_G7, 125);
      delay(125);
      noTone(Buzzer);

      //Warten
      delay((dauerGesamt + 1 - dauerSchluss - 0.85) * 900);
      digitalWrite(S5LED, LOW);
      //Ende
      delay((dauerGesamt + 1 - dauerSchluss - 0.85) * 100);
      while (i < dauerSchluss - 1) {
        tone(Buzzer, NOTE_G4);
        digitalWrite(S1LED, HIGH);
        digitalWrite(S2LED, HIGH);
        digitalWrite(S3LED, HIGH);
        digitalWrite(S4LED, HIGH);
        digitalWrite(S5LED, HIGH);
        digitalWrite(S6LED, HIGH);
        delay(500);
        digitalWrite(S5LED, LOW);
        digitalWrite(S1LED, LOW);
        digitalWrite(S2LED, LOW);
        digitalWrite(S3LED, LOW);
        digitalWrite(S4LED, LOW);
        digitalWrite(S6LED, LOW);
        noTone(Buzzer);
        delay(500);
        i++;
      }

      digitalWrite(S1LED, HIGH);
      digitalWrite(S2LED, HIGH);
      digitalWrite(S3LED, HIGH);
      digitalWrite(S4LED, HIGH);
      digitalWrite(S5LED, HIGH);
      digitalWrite(S6LED, HIGH);
      tone(Buzzer, NOTE_G5);
      delay(500);
      digitalWrite(S1LED, LOW);
      digitalWrite(S2LED, LOW);
      digitalWrite(S3LED, LOW);
      digitalWrite(S4LED, LOW);
      digitalWrite(S5LED, LOW);
      digitalWrite(S6LED, LOW);
      noTone(Buzzer);
      digitalWrite(S5LED, HIGH);
      delay(30);
      digitalWrite(S6LED, HIGH);
      delay(30);
      digitalWrite(S1LED, HIGH);
      delay(30);
      digitalWrite(S2LED, HIGH);
      delay(30);
      digitalWrite(S3LED, HIGH);
      delay(30);
      digitalWrite(S4LED, HIGH);
      delay(30);
      digitalWrite(S5LED, LOW);
      delay(30);
      digitalWrite(S6LED, LOW);
      delay(30);
      digitalWrite(S1LED, LOW);
      delay(30);
      digitalWrite(S2LED, LOW);
      delay(30);
      digitalWrite(S3LED, LOW);
      delay(30);
      digitalWrite(S4LED, LOW);
      goto Start;
    }



    //Spieler 6
    if (switchStateS6 == HIGH) {
      digitalWrite(S6LED, HIGH);
      for (int hz = 440; hz < 1000; hz++) {
        tone(Buzzer, hz, 50);
        delay(0.75);
      }

      //Warten
      delay((dauerGesamt + 1 - dauerSchluss) * 900);
      digitalWrite(S6LED, LOW);
      //Ende
      delay((dauerGesamt + 1 - dauerSchluss) * 100);
      while (i < dauerSchluss - 1) {
        tone(Buzzer, NOTE_G4);
        digitalWrite(S1LED, HIGH);
        digitalWrite(S2LED, HIGH);
        digitalWrite(S3LED, HIGH);
        digitalWrite(S4LED, HIGH);
        digitalWrite(S5LED, HIGH);
        digitalWrite(S6LED, HIGH);
        delay(500);
        digitalWrite(S1LED, LOW);
        digitalWrite(S2LED, LOW);
        digitalWrite(S3LED, LOW);
        digitalWrite(S4LED, LOW);
        digitalWrite(S5LED, LOW);
        noTone(Buzzer);
        delay(500);
        i++;
      }
      digitalWrite(S1LED, HIGH);
      digitalWrite(S2LED, HIGH);
      digitalWrite(S3LED, HIGH);
      digitalWrite(S4LED, HIGH);
      digitalWrite(S5LED, HIGH);
      digitalWrite(S6LED, HIGH);
      tone(Buzzer, NOTE_G5);
      delay(500);
      digitalWrite(S1LED, LOW);
      digitalWrite(S2LED, LOW);
      digitalWrite(S3LED, LOW);
      digitalWrite(S4LED, LOW);
      digitalWrite(S5LED, LOW);
      digitalWrite(S6LED, LOW);
      noTone(Buzzer);
      digitalWrite(S6LED, HIGH);
      delay(30);
      digitalWrite(S1LED, HIGH);
      delay(30);
      digitalWrite(S2LED, HIGH);
      delay(30);
      digitalWrite(S3LED, HIGH);
      delay(30);
      digitalWrite(S4LED, HIGH);
      delay(30);
      digitalWrite(S5LED, HIGH);
      delay(30);
      digitalWrite(S6LED, LOW);
      delay(30);
      digitalWrite(S1LED, LOW);
      delay(30);
      digitalWrite(S2LED, LOW);
      delay(30);
      digitalWrite(S3LED, LOW);
      delay(30);
      digitalWrite(S4LED, LOW);
      delay(30);
      digitalWrite(S5LED, LOW);
      delay(30);
      goto Start;
    }
  }

  else if (potVal < 145) {
    //Spieler 1
    if (switchStateS1 == HIGH) {
      //Ton bei Druck
      digitalWrite(S1LED, HIGH);
      tone(Buzzer, NOTE_G4, 35);
      delay(35);
      tone(Buzzer, NOTE_G5, 35);
      delay(35);
      tone(Buzzer, NOTE_G6, 35);
      delay(35);
      noTone(Buzzer);
      delay(dauerGesamt * 1000);
      digitalWrite(S1LED, LOW);
    }
  }

  //Spieler 2
  if (switchStateS2 == HIGH) {
    digitalWrite(S2LED, HIGH);
    //Ton bei Druck
    tone(Buzzer, NOTE_B5, 100);
    delay(100);
    tone(Buzzer, NOTE_E6, 700);
    delay(700);
    noTone(Buzzer);
    delay(dauerGesamt * 1000);
    digitalWrite(S2LED, LOW);
  }


  //Spieler 3
  if (switchStateS3 == HIGH) {
    digitalWrite(S3LED, HIGH);
    for (int hz = 2000; hz > 440; hz--) {
      tone(Buzzer, hz, 50);
      delay(0.5);
    }
    delay(dauerGesamt * 1000);
    digitalWrite(S3LED, LOW);
  }


  //Spieler 4
  if (switchStateS4 == HIGH) {
    digitalWrite(S4LED, HIGH);
    tone(Buzzer, NOTE_C7, 115);
    delay(125);
    tone(Buzzer, NOTE_C7, 240);
    delay(250);
    tone(Buzzer, NOTE_C7, 240);
    delay(250);
    tone(Buzzer, NOTE_GS6, 115);
    delay(125);
    tone(Buzzer, NOTE_C7, 240);
    delay(250);
    tone(Buzzer, NOTE_DS7, 115);
    delay(125);
    noTone(Buzzer);
    delay(dauerGesamt * 1000);
    digitalWrite(S4LED, LOW);

  }



  //Spieler 5
  if (switchStateS5 == HIGH) {
    digitalWrite(S5LED, HIGH);
    tone(Buzzer, NOTE_E6, 125);
    delay(125);
    tone(Buzzer, NOTE_G6, 125);
    delay(125);
    tone(Buzzer, NOTE_E7, 125);
    delay(125);
    tone(Buzzer, NOTE_C7, 125);
    delay(125);
    tone(Buzzer, NOTE_D7, 125);
    delay(125);
    tone(Buzzer, NOTE_G7, 125);
    delay(125);
    noTone(Buzzer);
    delay(dauerGesamt * 1000);
    digitalWrite(S5LED, LOW);
  }



  //Spieler 6
  if (switchStateS6 == HIGH) {
    digitalWrite(S6LED, HIGH);
    for (int hz = 440; hz < 1000; hz++) {
      tone(Buzzer, hz, 50);
      delay(0.75);
    }
    delay(dauerGesamt * 1000);
    digitalWrite(S6LED, LOW);
  }



}
Credits

renzosmania

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