#include <Keypad.h> // library for keypad
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd(0x27, 20, 4);

const byte ROWS = 4; //initializing the rows of keypad
const byte COLS = 4;//initializing the columns of keypad
char keys [ROWS] [COLS] = { // giving values to each key of the keypad
  {'1', '2', '3', '&'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '=', 'D'}
};
byte rowPins[ROWS] = {23,13,19,18}; //Arduino pins for rows of keypad
byte colPins[COLS] = {5,4,2,15}; // Arduino pins for columns of keypad
Keypad myKeypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); /* function for mapping the values on the keys*/
// assigning boolean data type to the variables and initializing them with zero
boolean present = false;
boolean next = false;
boolean final = false;
String num1, num2; // variables to display the keypad integer input
float ans;//  variable for storing the result of the BMI
char op;// assigning character data type for the character used for BMI
int ldr = 12;
int hasil, hasilMap;

void setup()
{
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  pinMode(ldr, INPUT);
  lcd.setCursor(5,0); // setting the place for displaying the first data line
  lcd.print("KELOMPOK 5"); //data to be displayed
  lcd.setCursor(5,1);//setting the place for displaying the second data line
  lcd.print("GlucoMeter");// data to be displayed
  delay(2000);// time for which the data will be displayed on LCD
  lcd.clear();// clearing the LCD
  lcd.setCursor(6,0);// setting the place for displaying the second data line
  lcd.print("Masukkan");//data to be displayed
  lcd.setCursor(2,1);
  lcd.print("Berat dan Tinggi:");
}
void loop(){
  hasil = analogRead(ldr);
  hasilMap = map(hasil, 0, 4095, 0, 350);
  Serial.println(hasilMap);
// using the getkey function to get the value of the key pressed
  char key = myKeypad.getKey();
  if (key != NO_KEY && (key=='1'||key=='2'||key=='3'||key=='4'||key=='5'||key=='6'||key=='7'||key=='8'||key=='9'||key=='0'))// check which key is pressed by checking its integer value
  {
    if (present != true)
    {
      num1 = num1 + key; // storing the value of key pressed in num1
      float numLength = num1.length();
      lcd.setCursor(0, 2); /* decaling the place where the first entry will be displayed*/
      lcd.print(num1); // printing the first number entered
    }
    else
    {
      num2 = num2 + key;//storing the value of second key pressed in num2
 float numLength = num2.length();
      lcd.setCursor(4, 2);/*decaling the place where the second entry will be displayed*/
      lcd.print(" ");
      lcd.print(num2); //printing the second number entered
      final = true;
    }
  }
// condition if key having the assigned operator for BMI calculation is pressed
  else if (present == false && key != NO_KEY && (key == '&'))
  {
    if (present == false)
    {
      present = true;
      op = key; // saving the key pressed for calculating the BMI
      lcd.setCursor(3,2); // setting the place for the data to be displayed
      lcd.print(op); // displaying the character used for BMI
    }
  }
// conditions to calculate the BMI
  else if (final == true && key != NO_KEY && key == '='){
    if (op == '&'){
    ans = (num1.toFloat() / (num2.toFloat()*num2.toFloat()))*10000;// formula to calculate the BMI
    }    
    // lcd.setCursor(0,2); // setting the place for the data to be displayed
    // lcd.print("Your BMI is:");// data to be displayed
    // lcd.print(ans); // displaying the answer for BMI calculation
    lcd.clear();// clearing the LCD
    if (ans<18.5){ // if BMI is less than 18.5 then you  are under weight
    if(hasilMap >= 70 && hasilMap <= 150){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("0.4 dosis");}
      else if(hasilMap >= 151 && hasilMap <= 175){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("1.4 dosis");}
      else if(hasilMap >= 176 && hasilMap <= 200){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("2.4 dosis");}
      else if(hasilMap >= 201 && hasilMap <= 225){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("3.4 dosis");}
      else if(hasilMap >= 226 && hasilMap <= 250){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("5.5 dosis");}
      else if(hasilMap >= 251 && hasilMap <= 275){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("7.5 dosis");}
      else if(hasilMap >= 276 && hasilMap <= 300){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("9.4 dosis");}
      else if(hasilMap > 300){
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("12.4 dosis");}
      else {
        lcd.setCursor(3,0);
        lcd.print("Anda kekurangan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Tidak perlu insulin");
      }
  }
    else if(ans<25){// if BMI is less than 25 then you have normal weight
      if(hasilMap >= 70 && hasilMap <= 150){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("0.4 dosis");}
      else if(hasilMap >= 151 && hasilMap <= 175){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("1.4 dosis");}
      else if(hasilMap >= 176 && hasilMap <= 200){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("2.4 dosis");}
      else if(hasilMap >= 201 && hasilMap <= 225){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("3.4 dosis");}
      else if(hasilMap >= 226 && hasilMap <= 250){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("5.5 dosis");}
      else if(hasilMap >= 251 && hasilMap <= 275){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("7.4 dosis");}
      else if(hasilMap >= 276 && hasilMap <= 300){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("9.4 dosis");}
      else if(hasilMap > 300){
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Anda Butuh Insulin:");
        lcd.setCursor(0,3);
        lcd.print("12.4 dosis");
      }
      else {
        lcd.setCursor(0,0);
        lcd.print("Berat badan normal");
        lcd.setCursor(0,2);
        lcd.print("Tidak perlu insulin");
      }
    
  }
    else if (ans<30){ //if BMI is less than 30 then you  are over weight
      if(hasilMap >= 70 && hasilMap <= 150){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("0.5 dosis");}
      else if(hasilMap >= 151 && hasilMap <= 175){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("2.5 dosis");}
      else if(hasilMap >= 176 && hasilMap <= 200){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("4.4 dosis");}
      else if(hasilMap >= 201 && hasilMap <= 225){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("6.6 dosis");}
      else if(hasilMap >= 226 && hasilMap <= 250){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("8.5 dosis");}
      else if(hasilMap >= 251 && hasilMap <= 275){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("10.5 dosis");}
      else if(hasilMap >= 276 && hasilMap <= 300){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("12.5 dosis");}
      else if(hasilMap > 300){
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("14.5 dosis");}
      else {
        lcd.setCursor(3,0);
        lcd.print("Anda kelebihan");
        lcd.setCursor(4,1);
        lcd.print("berat badan");
        lcd.setCursor(0,2);
        lcd.print("Tidak perlu insulin");
      }
    }
  else{ // else you are obese
      if(hasilMap >= 70 && hasilMap <= 150){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("0.6 dosis");}
      else if(hasilMap >= 151 && hasilMap <= 175){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(3,6);
        lcd.print("2.5 dosis");}
      else if(hasilMap >= 176 && hasilMap <= 200){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("6.6 dosis");}
      else if(hasilMap >= 201 && hasilMap <= 225){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("7.6 dosis");}
      else if(hasilMap >= 226 && hasilMap <= 250){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("9.6 dosis");}
      else if(hasilMap >= 251 && hasilMap <= 275){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("11.6 dosis");}
      else if(hasilMap >= 276 && hasilMap <= 300){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("14.6 dosis");}
      else if(hasilMap > 300){
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Anda butuh insulin:");
        lcd.setCursor(0,3);
        lcd.print("18.6 dosis");}
      else {
        lcd.setCursor(3,0);
        lcd.print("Anda obesitas");
        lcd.setCursor(0,2);
        lcd.print("Tidak perlu insulin");
      }
    }
      delay(2000);// time or which the data will be displayed
}
  // condition for clearing the LCD or starting the Arduino code again
else if (final == true && key != NO_KEY && key == '*'){
  lcd.clear();
  lcd.setCursor(1,1); // setting the place for the data to be displayed
  lcd.print("BMI anda: ");// data to be displayed
  lcd.print(ans); // displaying the answer for BMI calculation
  lcd.setCursor(1,2); // setting the place for the data to be displayed
  lcd.print("Glukosa: ");// data to be displayed
  lcd.print(hasilMap);
  lcd.print("mg/dL");

}
  else if (key != NO_KEY && key == 'C'){
    lcd.clear();
    present = false;
    final = false;
    setup();// calling the setup function to start the code again
    num1 = "";
    num2 = "";
    ans = 0;
    op = ' ';
  }
}