#include <ezButton.h>  // the library to use for SW pin
#include <LiquidCrystal_I2C.h> // Library to use for I2C
 
#define CLK_PIN 25 // ESP32 pin GPIO25 connected to the rotary encoder's CLK pin
#define DT_PIN  32 // ESP32 pin GPIO26 connected to the rotary encoder's DT pin
#define SW_PIN  33 // ESP32 pin GPIO27 connected to the rotary encoder's SW pin

#define DIRECTION_CW  0   // clockwise direction
#define DIRECTION_CCW 1  // counter-clockwise direction

int counter = 1;
int direction = DIRECTION_CW;
int CLK_state;
int prev_CLK_state;
LiquidCrystal_I2C lcd_1(0x27,16,2); // Parameters I2C
ezButton button(SW_PIN);  // create ezButton object that attach to pin 7;

void setup() {
   lcd_1.begin(22,21);
  lcd_1.init();                      
  lcd_1.init();          
  lcd_1.backlight();
  Serial.begin(9600);

  // configure encoder pins as inputs
  pinMode(CLK_PIN, INPUT);
  pinMode(DT_PIN, INPUT);
  button.setDebounceTime(50);  // set debounce time to 50 milliseconds

  // read the initial state of the rotary encoder's CLK pin
  prev_CLK_state = digitalRead(CLK_PIN);
}

void loop() {
  lcd_1.setCursor(0, 0);
  button.loop();  // MUST call the loop() function first

  // read the current state of the rotary encoder's CLK pin
  CLK_state = digitalRead(CLK_PIN);

  // If the state of CLK is changed, then pulse occurred
  // React to only the rising edge (from LOW to HIGH) to avoid double count
  if (CLK_state != prev_CLK_state && CLK_state == HIGH) {
    // if the DT state is HIGH
    // the encoder is rotating in counter-clockwise direction => decrease the counter
    if (digitalRead(DT_PIN) == HIGH) {
      counter--;
      direction = DIRECTION_CCW;
      lcd_1.clear();
    } else {
      // the encoder is rotating in clockwise direction => increase the counter
      counter++;
      direction = DIRECTION_CW;
      lcd_1.clear();
    }

  }
if(counter<1){
counter=2;
}
if(counter>2){
counter=1;
}
switch(counter){
  case 1:
  lcd_1.setCursor(0, 0);
  lcd_1.print(">OPC 1");
  lcd_1.setCursor(0, 1);
  lcd_1.print(" OPC 2");
  break;
  case 2:
  lcd_1.setCursor(0, 0);
  lcd_1.print(" OPC 1");
  lcd_1.setCursor(0, 1);
  lcd_1.print(">OPC 2");
  break;
}
  // save last CLK state
  prev_CLK_state = CLK_state;

  if (button.isPressed()) {
    lcd_1.println("The button is pressed");
  }
}