/*i9.Esboce o diagrama de ligações de um piezo e um potenciómetro ligado ao
arduino. Realize código que permite regular através do potenciómetro a 
frequência no piezo P1 entre 500-1500 Hz.

Buzzer
https://create.arduino.cc/projecthub/SURYATEJA/use-a-buzzer-module-piezo-speaker-using-arduino-uno-89df45

*/
int analogPin = A0; // potentiometer wiper (middle terminal) connected to analog pin 3
                    // outside leads to ground and +5V
float val = 0;  // variable to store the value read
const int buzzer = 9; //buzzer to arduino pin 9

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);           //  setup serial
}

void loop() {
  // put your main code here, to run repeatedly:
  val = analogRead(analogPin);  // read the input pin
  val = map(val, 0, 1023, 500, 1500);     // scale it to use it with the servo (value between 0 and 180)
  
  Serial.println(" Hz");
  tone(buzzer, val); 
  delay(100);        

}