#include "pitches.h"/*  Blink  Turns on an LED on for one second, then off for one second, repeatedly.  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO   it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to  the correct LED pin independent of which board is used.  If you want to know what pin the on-board LED is connected to on your Arduino model, check  the Technical Specs of your board  at https://www.arduino.cc/en/Main/Products    This example code is in the public domain.  modified 8 May 2014  by Scott Fitzgerald    modified 2 Sep 2016  by Arturo Guadalupi    modified 8 Sep 2016  by Colby Newman*/int melody[] = {  NOTE_C4,NOTE_C4, NOTE_G4, NOTE_G4, NOTE_A4, NOTE_A4,NOTE_G4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_D4,NOTE_D4,NOTE_C4,NOTE_G4,NOTE_G4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_D4,NOTE_G4,NOTE_G4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_D4,NOTE_C4,NOTE_C4, NOTE_G4, NOTE_G4, NOTE_A4, NOTE_A4,NOTE_G4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_D4,NOTE_D4,NOTE_C4};int noteDurations[] = {  4, 4, 4, 4, 4, 4, 2, 4,4,4,4,4,4,2,4, 4, 4, 4, 4, 4, 2, 4,4,4,4,4,4,2,4, 4, 4, 4, 4, 4, 2, 4,4,4,4,4,4,2};//bool btnstat=true;//bool playing=true;int dl=50;int pins[5]={3,5,7,9};// the setup function runs once when you press reset or power the boardvoid setup() {   //Serial.begin(9600);  // initialize digital pin LED_BUILTIN as an output.  for(int i=0;i<4;i++){    pinMode(pins[i], OUTPUT);  }      pinMode(12, INPUT_PULLUP);}//void setSwitch(){//  int stat=digitalRead(12);//  //Serial.println(stat);//  if(stat==0){//    if(btnstat){//      btnstat=false;      //    }else{//      btnstat=true; //    }//  }//}// the loop function runs over and over again forevervoid loop() {  int stat=digitalRead(12);  if(stat==1) return;  for (int thisNote = 0; thisNote < (sizeof(melody)/sizeof(int)); thisNote++) {    //setSwitch();    stat=digitalRead(12);    if(stat==1) return;    // to calculate the note duration, take one second    // divided by the note type.    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.    int noteDuration = 1000 / noteDurations[thisNote];    long led=random(0,4);    digitalWrite(pins[led], HIGH);    tone(2, melody[thisNote], noteDuration);    // to distinguish the notes, set a minimum time between them.    // the note‘s duration + 30% seems to work well:    int pauseBetweenNotes = noteDuration * 1.30;    delay(pauseBetweenNotes);    digitalWrite(pins[led], LOW);    // stop the tone playing:    noTone(2);  }  /*  for(int i=0;i<4;i++){    for(int j=0;j<3;j++){      digitalWrite(pins[i], HIGH);   // turn the LED on (HIGH is the voltage level)      delay(dl);                       // wait for a second      digitalWrite(pins[i], LOW);    // turn the LED off by making the voltage LOW      delay(dl);     }    //delay(200);  }  delay(500);  */}