Piezo Button

piezo.ino

const int piezoPin = A0;
const int threshold = 600;

int sensorReading = 0;
int outputPin = 2;

void setup() {
  pinMode(piezoPin, INPUT);
  pinMode(outputPin, INPUT);
  Serial.begin(9600);
}

int buzzDelay = 2000;
int buzzLength = 30;
void loop() {
  pinMode(outputPin, INPUT);
  sensorReading = analogRead(piezoPin);
  Serial.println(sensorReading);
  if (sensorReading >= threshold){
    Serial.println("Pressed!");
    pinMode(outputPin, OUTPUT);
    for(int b = 0; b < buzzLength; b++ ){
      digitalWrite(outputPin, HIGH);
      delayMicroseconds(buzzDelay);
      digitalWrite(outputPin, LOW);
      delayMicroseconds(500);
    }
    pinMode(outputPin, INPUT);
  }
  delay(100);
}