#include "pitches.h"
void setup(){
	pinMode(7,INPUT_PULLUP);
	pinMode(6,INPUT_PULLUP);
	pinMode(5,INPUT_PULLUP);
	pinMode(4,INPUT_PULLUP);
}
void loop(){
	if(digitalRead(7)==LOW) tone(8,NOTE_C4,250);	// pin7:button,pin8:buzzer,1/4
	else if(digitalRead(6)==LOW) tone(8,NOTE_D4,250);
	else if(digitalRead(5)==LOW) tone(8,NOTE_E4,250);
	else if(digitalRead(4)==LOW) tone(8,NOTE_F4,250);
	else noTone(8);
}