int sensor=A0;
int led=9;
int buz=10;

int val=0;
void setup() {
  // put your setup code here, to run once:
pinMode(led , OUTPUT);
pinMode(buz, OUTPUT);
pinMode(sensor , INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
val=analogRead(sensor);
digitalWrite(led, HIGH);
delay(val);
digitalWrite(led, LOW);
delay(val);
tone(buz , val);
float voltage=val*(5.0/1023.0);

Serial.println(voltage);
}