Frequency sweep

Projects General Guidance
5

Here is with 2 buttons


int buzzer = A5;

void setup()
{
  Serial.begin(19200);
  pinMode(buzzer, OUTPUT); //setting up buzzer pin as output
  pinMode(A3, INPUT_PULLUP);
  pinMode(A4, INPUT_PULLUP);
}
void loop()
{

  int i;
  if (digitalRead(A3) == 0) {
    i++ ;
  }
  if (digitalRead(A4) == 0) {
    i-- ;
  }

  //tone(buzzer,1000);  //freq 1000 Hz,
  tone(buzzer, i);

  Serial.println(i);
  /*
     lcd.setCursor(0,1);
     lcd.print(' ');
     lcd.print(i);
  */
}