#include <Encoder.h>
#include <LiquidCrystal_I2C.h>

// Define pins for the encoder
#define PIN_ROTARY_CLK    2   // Used for generating interrupts using CLK signal
#define PIN_ROTARY_DAT    3   // Used for reading DT signal
#define PIN_ROTARY_SW     4

Encoder knob(PIN_ROTARY_CLK, PIN_ROTARY_DAT);

bool rotary_click = false;

// Define LCD address and dimensions
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Menu variables
int currentMenuItem = 0;
String menuItems[] = {"Continuous Flow", "Volume Flow"};
const int numMenuItems = sizeof(menuItems) / sizeof(menuItems[0]);
long previousPosition = 0;  // Store previous encoder position



void printMenu() {
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Set Function");
  lcd.setCursor(0,1);
  lcd.print(menuItems[currentMenuItem]);
}

void setup() {
  lcd.init();
  lcd.backlight();
  printMenu();
  pinMode(PIN_ROTARY_SW, INPUT);
  Serial.begin(9600);
}

void loop() {
  int newPosition = knob.read()/4; //change the number according to the step of the encoder 
   
  if (newPosition != previousPosition) 
  {
    previousPosition = newPosition;
    if (currentMenuItem < numMenuItems)
    {
    currentMenuItem = currentMenuItem + 1;
    if (currentMenuItem == numMenuItems)
    currentMenuItem = 0;
    }
    printMenu();
     // Update previous position
  }

  bool rotary_click = digitalRead(PIN_ROTARY_SW);
  Serial.println(rotary_click);


  // (Optional) Check for button presses to select menu items
  // if (digitalRead(4) == LOW) {
    // Handle menu item selection logic here
  // }
}