/*  
Hard mode:⁣
you select the duration of the light being on and off while the program is running by entering it in the serial monitor.
Write a code that takes the data from the serial monitor and delays by that amount of time.
*/


int D; //delay

void setup() {
  pinMode(LED_BUILTIN,OUTPUT); // initialize digital pin LED_BUILTIN as an output.
  Serial.begin(9600);  // Exchanges messages with the serial moniter

  D=0;
}

void loop() {
    Serial.println("Enter the LED duration"); // Prints the sentence to the serial moniter and creates a new line every time the sentence is written


  while (Serial.available() == 0){ //the default value in recived from the serial moniter is 0. this code is used to not do anything while nothing is written in the serial moniter.
  }

  D = Serial.parseFloat(); //reads the floating value entered in the serial moniter
  D=D*1000; // mutiplies the values by 1000 to convert from second to milliseconds
  if (D>0){  // when D is greater then 0, light up the LED for the number of seconds writen in the serial moniter
  digitalWrite(LED_BUILTIN,HIGH);
  delay (D);
  digitalWrite(LED_BUILTIN,LOW);
  delay(2000);
  }
}