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

#define outputA 2
#define outputB 3


const int stepsPerRevolution = 1800;  // change this to fit the number of steps per revolution

const int rolePerMinute = 15;         // Adjustable range of 28BYJ-48 stepper is 0~17 rpm




// initialize the stepper library on pins 8 through 11:

Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);


int counter = 0; 
int aState, bState;
int aLastState;
String Medicine1 = "Panadol"; 
String Medicine2 = "Accutane"; 
String Medicine3 = "strepsils"; 
String Medicine4 = "Vicks"; 
String Medicine5 = "Vitamin C"; 
uint32_t interval = 5000;

LiquidCrystal_I2C lcd(0x27,  16, 2);

 void setup() { 
  
  myStepper.setSpeed(rolePerMinute);

   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

  


  static uint32_t nextTime;

  if (millis() - nextTime >= interval) {
  nextTime += interval;
    Serial.println("Medicine Time!");
    myStepper.step(100);
  }





 }