/* INDUSTRIAL INTERNET OF THINGS | PRAKTEK LCD ENCODER | KELAS XI | MEKATRONIKA | SMKN 2 CIMAHI | FAUZI NUGROHO */

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

int counter = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display

#define PIN_A      2 // CLK
#define PIN_B      4 // DT
#define PIN_BUTTON 5 // SW

#define DEBONCE_TO 150

volatile bool putarCCW = false;
volatile bool putarCW = false;

unsigned long debounceTime = 0;

bool dataCW = false;
bool dataCCW = false;

void checkEncoder() {
  if ((!putarCCW)&&(!putarCW)) {
    int pinA = digitalRead(PIN_A);
    delayMicroseconds(1500);
    int pinB = digitalRead(PIN_B);
    if (pinA == pinB){
      if (dataCW) {
        putarCCW = true;
      } else {
        putarCW = true;
      }    
    } else {
      if (dataCCW) {
        putarCW = true;
      } else {
        putarCCW = true;
      }
    }    
  }
}

void setup() {
  Serial.begin(115200);

  lcd.init();                       // Initialize the LCD
  lcd.backlight();                  // Turn on the backlight
  lcd.clear();                      // Clear the LCD screen

  pinMode(PIN_A, INPUT_PULLUP);
  pinMode(PIN_B, INPUT_PULLUP);
  pinMode(PIN_BUTTON, INPUT_PULLUP);

  attachInterrupt(PIN_B, checkEncoder, CHANGE);
  Serial.println("Siap membaca data encoder: ");

  lcd.clear();
  lcd.setCursor(0, 0);               // Set the cursor to the first column and first row
  lcd.print("   SIAP PUTAR   ");     // Print some text
  lcd.setCursor(0,1);
  lcd.print("KANAN ATAU KIRI!");
}

void loop() {
  static int value = 0;

  if (!digitalRead(PIN_BUTTON)) {
    value = 0;
    Serial.print("Reset: ");
    Serial.println(value);

    lcd.clear();
    lcd.setCursor(0, 0);               // Set the cursor to the first column and first row
    lcd.print(" DATA DIRESET ! ");     // Print some text
    lcd.setCursor(0,1);
    lcd.print(value);
  }

  if (putarCW) {
    value++;
    Serial.print("Memutar ke Arah Jarum jam / CW: ");
    Serial.println(value);

    lcd.clear();
    lcd.setCursor(0, 0);               // Set the cursor to the first column and first row
    lcd.print(">>>> JARUM JAM !");     // Print some text
    lcd.setCursor(0,1);
    lcd.print(value);

    putarCW = false;
    dataCCW = true;
    debounceTime = millis();
  }

  if (putarCCW) {
    value--;
    Serial.print("Memutar ke Arah Kebalikan Jarum Jam / CCW: ");
    Serial.println(value);

    lcd.clear();
    lcd.setCursor(0, 0);               // Set the cursor to the first column and first row
    lcd.print("<<<< JARUM JAM !");     // Print some text
    lcd.setCursor(0,1);
    lcd.print(value);

    putarCCW = false;
    dataCW = true;
    debounceTime = millis();
  }

  if ((millis()-debounceTime) > DEBONCE_TO) {
    dataCW = false;
    dataCCW = false;
  }
}