reflex sample

reflex.ino

/*
  Button
 
 Turns on and off a light emitting diode(LED) connected to digital  
 pin 13, when pressing a pushbutton attached to pin 2. 
 
 
 The circuit:
 * LED attached from pin 13 to ground 
 * pushbutton attached to pin 2 from +5V
 * 10K resistor attached to pin 2 from ground
 
 * Note: on most Arduinos there is already an LED on the board
 attached to pin 13.
 
 
 created 2005
 by DojoDave <http://www.0j0.org>
 modified 30 Aug 2011
 by Tom Igoe
 
 This example code is in the public domain.
 
 http://www.arduino.cc/en/Tutorial/Button
 */

// constants won't change. They're used here to 
// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin
const int speakerPin = 8;

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  Serial.begin(9600);

  pinMode(ledPin, OUTPUT);      
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT_PULLUP); 
  pinMode(speakerPin, OUTPUT);  
}


unsigned long lastMillis;

void loop(){


  initTest();
  
  
  checkButton();

}

void initTest() {
  delay(random(1000,3000));
  lastMillis = millis();
  //digitalWrite(ledPin, HIGH);
}

void checkButton() {
  while(true) {
    buttonState = digitalRead(buttonPin);
  //  Serial.println(buttonState);
    if(buttonState == LOW) {
      //digitalWrite(ledPin, LOW);
      Serial.println(millis()-lastMillis);
      delay(1000);
      break;
    }
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(100);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(100);
  }
}