Variable-Sided Digital Dice

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

LiquidCrystal_I2C LCD(0x27,20,4); 

int button = A0; //A0 connected to push button
int powerOut = A2; //A0 set to a constant power output for pullup resistor
int pot = A1; //A1 connected to potentiometer
long randomNum = 0; //initialize random number to 0
int generating = 0; //state for generating the random number
int upperLimit = 0; //upperlimit for die
int potVal = 0; //initialize input from potentiometer
int state = 0;

void setup()  
{
  Serial.begin(9600);  //set baude rate to 9600 [standard communication rate for LCD screens]
  pinMode(button, INPUT_PULLUP); //use internal pullup resistor on button input pin
  pinMode(powerOut, OUTPUT); //set A2 to be a power output
  pinMode(pot, INPUT); //set A1 to be input for potentiometer
  LCD.begin();//Initializing display
  LCD.backlight();//To Power ON the back light
  delay(100); //pause for 100ms
  LCD.clear(); //clear screen
  delay(200); //pause for 200ms
  digitalWrite(powerOut, HIGH); //set A2 to constantly output 5V
}
 
void loop() // run over and over
{
  digitalWrite(powerOut, LOW); //set A2 to constantly output 0V
  LCD.setCursor(0,0);
  LCD.print("  DM BLAISE'S DIE  ");
  state = digitalRead(button);
  potVal = analogRead(pot);
  delay(10);
  if (potVal < 25){ //if potentiometer value is less than 25..
    upperLimit = 3;  //set upper limit to 3 (random function is upper limit exclusive so this correlates to a D2)
  }
  else if (potVal < 50){
    upperLimit = 5; //D4
  }
    else if (potVal < 75){
    upperLimit = 7; //D6
  }
    else if (potVal < 100){
    upperLimit = 9; //D8
  }
    else if (potVal < 125){
    upperLimit = 11; //D10
  }
      else if (potVal < 150){
    upperLimit = 13; //D12
  }
      else if (potVal > 150){
    upperLimit = 21; //D20
  }
  LCD.setCursor(9,1); //column 9, second row down
  LCD.print("D"); //print D
  LCD.setCursor(10,1); //column 10, second row down
  LCD.print(upperLimit-1); //subtract 1 to reveal actual value
  LCD.print("     "); //space to overright old data printed on screen
  if (state == LOW){ //if the button has been pressed (0V connected to A0)
    LCD.setCursor(0,0); //set curser at first pixel
    LCD.print("  DM BLAISE'S DIE  "); //center text on top row
    generating = 1; //state of loop is 1 
    randomNum = random(1, upperLimit); //generate a number between 1 and set value (upper value EXCLUSIVE)
    LCD.clear(); //clear screen
    LCD.setCursor(9,1); //column 9, second row down
    LCD.print("D"); //print "D" for Dice
    LCD.setCursor(10,1); //Column 10, second row down
    LCD.print(upperLimit-1); //subtract one from upperLimit to reveal the die number
    LCD.print("     "); //space
    LCD.setCursor(9,2); //column 9, third row down
    LCD.print(randomNum); //print the random number
    delay(100); //delay 100ms to debounce the button
    while (generating == 1){ //stay in a loop until the button is released
       if (digitalRead(button) == HIGH) { //if button state returns to high
       generating = 0; //set state variable to 0
       delay(100); //delay 100ms
    }
  }
}
}