   lcd.clear();
   
   kph = calculateKPH();
+  mph = calculateMPH();
   
-  lcd.print("Spd: ");
   lcd.print(kph);
-  lcd.print("kph");
+  lcd.print("kph/");
+  lcd.print(mph);
+  lcd.print("mph");
   
   lcd.setCursor(0,1);
   lcd.print("AccY:");

const float WHEEL_RADIUS = 6.0; // in cm
const float WHEEL_CIRCUMFERENCE = 2 * WHEEL_RADIUS * PI;
double kph = 0.0;

// Hall effect sensor read pin, make it an interrupt pin so we catch all revolutions
const byte HALL_SENSOR = 2;

  currentMillis = millisSinceLastTick;
  return cmps/10000 *360;
}

double calculateMPH() {
   return kph * 1.6093;
}
