// Compiled and tested with no errors
// DIY Measuring wheel using Arduino and Rotary encoder with reset button
// source - www.circuitschools.com
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

#define outputA 2  //CLK pin
#define outputB 8  //DT pin
#define outputC 3  //CLK pin
#define outputD 9  //DT pin
#define rstbtnX  4  //reset button pin
#define rstbtnY  7  //reset button pin

int counterX = 0;
int counterY = 0;
const float pi = 3.14; // Pi value 

const int XR = 5;  //Radius of the wheel from center to edge
const int XN = 360; //no of steps for one rotation
const int YR = 5;  //Radius of the wheel from center to edge
const int YN = 360; //no of steps for one rotation
float distanceY = 0;
float distanceX = 0;

void setup() {
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.print ("CIRCUITSCHOOLS..");
  lcd. setCursor (0, 1);
  lcd.print ("Measuring Wheel");
  
delay(2000);
lcd.clear();

  // Initialize encoder pins
  pinMode(outputA, INPUT);
  pinMode(outputB, INPUT);
  pinMode(outputC, INPUT);
  pinMode(outputD, INPUT);
  pinMode(rstbtnX, INPUT_PULLUP);
  pinMode(rstbtnY, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(outputA), readEncoderX, FALLING);
  attachInterrupt(digitalPinToInterrupt(outputC), readEncoderY, FALLING);
}

void readEncoderX() {
  int bValue = digitalRead(outputB);
  if (bValue == HIGH) {
    counterX++; // Clockwise
  }
  if (bValue == LOW) {
    counterX--; // Counterclockwise
  }
}

void readEncoderY() {
  int bValue = digitalRead(outputD);
  if (bValue == HIGH) {
    counterY++; // Clockwise
  }
  if (bValue == LOW) {
    counterY--; // Counterclockwise
  }
}

// Get the counter value, disabling interrupts.
// This make sure readEncoder() doesn't change the value
// while we're reading it.
int getCounterX() {
  int result;
  noInterrupts();
  result = counterX;
  interrupts();
  return result;
}

void resetCounterX() {
  noInterrupts();
  counterX = 0;
  interrupts();
}




// Get the counter value, disabling interrupts.
// ThiEncs make sure readoder() doesn't change the value
// while we're reading it.
int getCounterY() {
  int result;
  noInterrupts();
  result = counterY;
  interrupts();
  return result;
}

void resetCounterY() {
  noInterrupts();
  counterY = 0;
  interrupts();
}

void loop() {
  distanceX = ((2*pi*XR)/XN) * getCounterX();
  distanceY = ((2*pi*YR)/YN) * getCounterY();
  lcd.setCursor(0, 0);
  lcd.print("DistanceX: in mms");
  lcd.setCursor(0, 1);
  lcd.print(distanceX);
  lcd.print("        ");
  
  
  lcd.setCursor(0, 2);
  lcd.print("DistanceY: in mms");
  lcd.setCursor(0, 3);
  lcd.print(distanceY);
  lcd.print("        ");
 
   if (digitalRead(rstbtnX) == LOW) {
    resetCounterX();
  }
  if (digitalRead(rstbtnY) == LOW) {
    resetCounterY();
  }
}