   // No end of line has been found, so return -1.
   return -1;
 }
+

const char enableKey = 'e';
const char disableKey = 'd';
const char powerKey = 'p';

boolean laserEnabled = false;
boolean inAfterStartState = true;

  pinMode(prrPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(guideLaserPin, OUTPUT);
  digitalWrite(guideLaserPin, HIGH);
  Serial.begin(9600);
}

