const int ledPin = 2;     // LED connected to digital pin 2
const int buttonPin = 3;  // Push button connected to digital pin 3

unsigned long startTime;  // Variable to store the start time of LED on
unsigned long endTime;    // Variable to store the end time of LED on
unsigned long pressTime;  // Variable to store the time button is pressed
unsigned long ledDuration; // Variable to store random LED on duration

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  
  Serial.begin(9600); // Initialize serial communication
  
  // Seed random number generator
  randomSeed(analogRead(0));
}

void loop() {
  // Generate random LED on duration
  ledDuration = random(1000, 5001);
  
  // Turn on LED
  digitalWrite(ledPin, HIGH);
  startTime = millis(); // Record start time
  
  // Wait for LED on duration
  delay(ledDuration);
  
  // Turn off LED
  digitalWrite(ledPin, LOW);
  endTime = millis(); // Record end time
  
  // Wait for button press
  while (digitalRead(buttonPin) == HIGH) {
    // Wait for button press
  }
  pressTime = millis() - endTime; // Calculate button press time
  
  // Calculate score based on how close press time is to LED duration
  int score = map(abs(pressTime - ledDuration), 0, 4000, 100, 0); // Map difference to score range
  
  // Display score on serial monitor
  Serial.print("Your score: ");
  Serial.println(score);
  
  // Wait before starting the next round
  delay(1000);