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// C4_Reaction_Time_Tester
// Reports over the serial port how many milli seconds it
// takes you to remove your finger from the pushbutton after
// the LED turns on.

// Constants used to set pin numbers
const int buttonPin = 12; // the number of the pushbutton pin

// variables
int buttonState = 0; // pushbutton status variable
const int ledPin = 11; // the number of the LED pin
int reactionTime = 0; // reaction time variable

unsigned long startTime = 0;
unsigned long endTime = 0;

long randNumber;

void setup() {
  // initialize Serial communications
  Serial.begin(57600);
  Serial.println("Test your reaction time.");
  Serial.println("Hold down button and release when LED comes on.");

  // set the buttonPin mode to INPUT
  pinMode(buttonPin, INPUT);
  // set the ledPin mode to OUTPUT
  pinMode(ledPin, OUTPUT);
}

void loop(){

  // get the state of the pushbutton
  buttonState = digitalRead(buttonPin);

  // is the button pressed?
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {

    // select a random number of milliseconds from 1000 to 5000
    randNumber = random(1000,5000);

    // turn LED on:
    digitalWrite(ledPin, HIGH);

    // leave the LED on for the randome milliseconds
    delay(randNumber);

     // turn LED off:
    digitalWrite(ledPin, LOW);

    // get the start time as soon as the LED goes off
    startTime = millis();

    // wait until the subjects gets his finger off the button
    // read the button state until it is equal to HIGH
    do{
       // get the state of the pushbutton
       buttonState = digitalRead(buttonPin);
    }while(buttonState == HIGH);

    // get the end time as soon as the finger is off the switch
    endTime = millis();

    // Tell the world your reaction time
    Serial.print("You took: ");
    Serial.print(endTime-startTime,DEC);
    Serial.println(" milliseconds.");
  }
}