 
 void setup() {
   Serial.begin(115200);
-  Serial.println(WHEEL_CIRCUMFERENCE);
+  
+  Serial.print("Set for wheel circumference: ");
+  Serial.print(WHEEL_CIRCUMFERENCE);
+  Serial.println("cm");
   
   pinMode(HALL_SENSOR, INPUT_PULLUP);
   attachInterrupt(0,triggerCount, FALLING);

  
*/

#include <LiquidCrystal.h>
#include <Wire.h>
#include <Adafruit_MMA8451.h>
#include <Adafruit_Sensor.h>

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

// Hall effect sensor read pin, make it an interrupt pin so we catch all revolutions
const byte HALL_SENSOR = 2;
boolean isHallSensorTriggered = false;
int tickCount = 0;
int currentMillis = 0;
int millisSinceLastTick = 0;

// 16x2 LCD display pins
const byte LCD_BACKLIGHT = 5;

  // How many CM per second we've traveled, based on wheel circumference and number of wheel turns since last check
  double cmps =  (1000/(millisSinceLastTick - currentMillis)) * WHEEL_CIRCUMFERENCE * tickCount;
  // reset counts
  tickCount = 0.0;
  currentMillis = millisSinceLastTick;
  if (isnan(cmps)) {
    cmps = 0.0; 
  }
  return cmps/10000.0 * 360.0;
}

double calculateMPH() {
