# Pin 3 -> LED
# Pin 8 -> React button, pressed 8 HIGH, not preesed LOW
# Pin 9 -> Start button, pressed 8 HIGH, not preesed LOW

const int reset = 9;
const int react = 8;
const int led = 3;
unsigned long starttime;
unsigned long endtime;
float result;

void setup() {
  // put your setup code here, to run once:
  pinMode(reset, INPUT);
  pinMode(react, INPUT);
  pinMode(led, OUTPUT);
  digitalWrite(led,LOW);
  randomSeed(analogRead(A0));
  Serial.begin(9600);
}

void play(){
  int randomtime = random(1,6);
  delay(randomtime*1000);
  digitalWrite(led, HIGH);
  Serial.println("LED is ON");
  starttime = millis();
  if(digitalRead(react)){
    Serial.println("STOP CHEATING!!!");
    return;
  }
  while(!digitalRead(react)){
      
  }
  endtime = millis();
  Serial.print("Reflex time is : " );
  result = endtime-starttime;
  Serial.println(result );
  Serial.print(result/1000);
  Serial.println(" s" );
  return;
}
  


void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(reset)){
    digitalWrite(led, LOW);
    Serial.println("LED is OFF");
    
    play();  
  }
}