#include <LiquidCrystal_I2C.h>
#include  <Wire.h>
 
#define outputA 2
#define outputB 3

int counter = 0; 
int aState, bState;
int aLastState;
String Medicine1 = "Panadol"; 
String Medicine2 = "Accutane"; 
String Medicine3 = "strepsils"; 
String Medicine4 = "Vicks"; 
String Medicine5 = "Vitamin C"; 

LiquidCrystal_I2C lcd(0x27,  16, 2);

 void setup() { 
   pinMode (outputA,INPUT_PULLUP);
   pinMode (outputB,INPUT_PULLUP);
   
   Serial.begin (9600);
   // Reads the initial state of the outputA
   aLastState = digitalRead(outputA);   

   
  //initialize lcd screen. screen messes up without this
  lcd.init();
  // turn on the backlight
  lcd.backlight();

 } 

 void loop() { 
   aState = digitalRead(outputA); // Reads the "current" state of the outputA
   // If the previous and the current state of the outputA are different, that means a Pulse has occured
   if (aState != aLastState){     
     // If the outputB state is different to the outputA state, that means the encoder is rotating clockwise
     if (digitalRead(outputB) != aState) { 
       counter ++;
       if ( counter > 30)  counter = 0;

     } else {
       counter --;
       if ( counter < 0)  counter = 30;
     }
     lcd.setCursor(0, 0);
     lcd.print("Med: ");
     if (counter >= 0 && counter < 7){
     lcd.clear();
     lcd.print("Medicine #1");
     lcd.setCursor(0,1);
     lcd.print(Medicine1);
     }

     if (counter > 6 && counter < 13){
     lcd.clear();
     lcd.print("Medicine #2");
     lcd.setCursor(0,1);
     lcd.print(Medicine2);
     }

    if (counter > 12 && counter < 19){
     lcd.clear();
     lcd.print("Medicine #3");
     lcd.setCursor(0,1);
     lcd.print(Medicine3);
     }

    if (counter > 18 && counter < 25){
     lcd.clear();
     lcd.print("Medicine #4");
     lcd.setCursor(0,1);
     lcd.print(Medicine4);
     }

    if (counter > 24 && counter < 31){
     lcd.clear();
     lcd.print("Medicine #5");
     lcd.setCursor(0,1);
     lcd.print(Medicine5);
     }
     
     } 
   aLastState = aState; // Updates the previous state of the outputA with the current state
 }