gridmark_strobe.ino

/*
 * 
  State change detection (edge detection)
 http://www.arduino.cc/en/Tutorial/ButtonStateChange
 */


const int  buttonPin = 3;
const int outPin = 13;

int buttonState = 0;
int lastButtonState = 0;

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(outPin, OUTPUT);
}


void loop() {

  buttonState = digitalRead(buttonPin);
  
  if (buttonState != lastButtonState) {
    if (buttonState == HIGH){  
      for(int i=0; i<171; i++ ){
        digitalWrite(outPin, HIGH);
        delay(20);
        digitalWrite(outPin, LOW);
        delay(20);  
      }
    }
    delay(1000);
  }

  lastButtonState = buttonState;
}