const int led_1 = 11 , led_2 = 12 ,led_3 = 13 ;
const int Trig=6,Echo=7;

float distance;
unsigned long duration;

unsigned long startMillis,startMillis_2,startMillis_3;
unsigned long currentMillis;

byte Blink_1,Blink_2,Blink_3;
const short passiveDelay=400;
//const short passiveDelay=400;--- amount of delay for the timer delay
//short hold around 20000 value it can handle i think?

void setup() {
  Serial.begin(115200);
  pinMode(Trig, OUTPUT);
  pinMode(Echo, INPUT);
}

void Ultrasonic(){
  // Start a new measurement:
  // Clears the trigPin
  digitalWrite(Trig, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(Trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(Echo, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2;
  // Prints the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print("cm |");
}



void Led_1(){

if(distance >= 30){
  //if the distance is greater then 30 is true do nothing if it's false do another statement
  Serial.print(" Led 1:OFF");
  digitalWrite(led_1,LOW);
  Blink_1=0;
  //reset the value
}
else if(distance <= 30){
  //distance less than 30 true turn led 1 on if false off

  Serial.print(" Led 1:ON");
  if(Blink_1 != 2){  
    // if the blink value is not equal 2 than true if it equal false
    digitalWrite(led_1,LOW);
  }else{
    digitalWrite(led_1,HIGH);
  }
  if (currentMillis - startMillis >= passiveDelay && Blink_1 != 2)  
  //test whether the period has elapsed and the blink amount
  {
    startMillis = currentMillis; 
    //IMPORTANT to save the start time of the current LED state.
    digitalWrite(led_1,HIGH);  
    //if so, change the state of the LED.  Uses a neat trick to change the state
    Blink_1=Blink_1+1;
  }
}
}

void Led_2(){

if(distance <= 30 || distance >= 45 ){
  //if the distance is less then 30 or Greater then 45 is
  Serial.print(" Led 2:OFF");
  digitalWrite(led_2,LOW);
  Blink_2=0;//reset the value
}
else if(distance <= 45){
  //distance less than 30 true turn led 2 on if false off

  Serial.print(" Led 2:ON");
  if(Blink_2 != 4){  
    // if the blink value is not equal 2 than true if it equal false
    digitalWrite(led_2,LOW);
  }else{
    digitalWrite(led_2,HIGH);
  }
  if (currentMillis - startMillis_2 >= passiveDelay && Blink_2 != 4){
  //test whether the period has elapsed and the blink amount
  //act as a delay
   
    startMillis_2 = currentMillis;  
    //IMPORTANT to save the start time of the current LED state.
    digitalWrite(led_2,HIGH);  
    //if so, change the state of the LED.  Uses a neat trick to change the state
    Blink_2=Blink_2+1;
  }
}




}
void Led_3(){

if(distance <= 45 || distance >= 60 ){
  //if the distance is less then 45 or Greater then 60 is
  Serial.print(" Led 3:OFF");
  //true do nothing if it's false do another statement
  digitalWrite(led_3,LOW);  
  Blink_3=0;
  //reset the value
}
else if(distance <= 60){
  //distance less than 30 true turn led 2 on if false off

  Serial.print(" Led 3:ON");
  if(Blink_3 != 6){  
    // if the blink value is not equal 2 than true if it equal false
    digitalWrite(led_3,LOW);
  }else{ digitalWrite(led_3,HIGH);
  }
  if (currentMillis - startMillis_3 >= passiveDelay && Blink_3 != 6){
  //test whether the period has elapsed and the blink amount
  //act as a delay of 300 miliseconds (delay(300);)

    startMillis_3 = currentMillis;  
    //IMPORTANT to save the start time of the current LED state.

    digitalWrite(led_3,HIGH);  
    //if so, change the state of the LED.  Uses a neat trick to change the state

    Blink_3=Blink_3+1;
    //count the amount of blink
  }
}
}
void loop() {
  currentMillis = millis();
  //milis timer

Ultrasonic();
//Read the UltraSonic Sensor

Led_1();
//Trigger at 30 cm and lower also blink 2
Led_2();
//Trigger at 45/below cm only the middle led and blink 4
Led_3();
//Trigger at 60/below cm only the Last led and blink 6

Serial.println(" ");
}