Need Help with Piezo Buzzer and Ultrasonic Sensor code

Projects Programming
11

This is what I came up with. According to the serial monitor the sensor is working just fine, but the buzzer is not buzzing, ever. Where did I go wrong editing the code? Thank you, I do appreciate your time.

/*
 HC-SR04 Ping distance sensor]
 VCC to arduino 5v GND to arduino GND
 Echo to Arduino pin 13 Trig to Arduino pin 12
 More info at: http://goo.gl/kJ8Gl
*** edited by LarryD and KalELonRedKryptonite  ***
 */

#define trigPin 12
#define echoPin 13


void setup() {

  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(4,OUTPUT);
  
}

void loop() {

	int duration, distance;
	int hysteresis = 5;       // minimum acceptable change
	boolean buzzState = false;  // false = buzzer is off
	unsigned long buzzDelay;  //Time the buzzer will be On
	unsigned long buzzMilli;  //Time the buzzer went On
	int lastDistance;  // = the last read distance value


	digitalWrite(trigPin, HIGH);
	delayMicroseconds(1000);
	digitalWrite(trigPin, LOW);
	duration = pulseIn(echoPin, HIGH);
	distance = (duration/2) / 29.1;
  
  
  
  if (distance >= 200 || distance <= 0)
  {
    Serial.println("Out of range");
  }
  else
  {
    Serial.print(distance);
    Serial.println(" cm");
  }

  // Has the distance changed significantly?
  if ((lastDistance + hysteresis) < distance || (lastDistance - hysteresis) > distance)
  {
    lastDistance = distance;
    buzzDelay = distance;
    buzzMilli = millis();
    buzzState = true; // indicate the buzzer is now on
    digitalWrite(4,HIGH);  //turn on the buzzer
  }

  if (buzzState == true && (millis() - buzzMilli >= buzzDelay))    //is time left and is the buzzer ON?
  {
    digitalWrite(4,LOW); //turn off the buzzer
    buzzState = false;  //indicate the buzzer is now off
  }
}   
   // END of loop()