D1Mini

//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

#define MAX_WORD_COUNT 100

const int switchPin = 14; // This is labeled D5 on the board
const int removeWordPin = 12; // this is labeled as D6 on the board
const int groundPin1 = 15; // the wemos d1 has only 1 ground pin, used by the screen. setting an additional to LOW to use with the switch. This is labeled D8 on the board
const int groundPin2 = 13; // another ground pin, to use with the "remove word" button. this is D7 on the board
int one_at_a_time = 0;
int removeIndex = 0;
int randomIndex = -1;

String vocabulary[MAX_WORD_COUNT] = {
  "a", "about", "all", "am", "an", "and", "are", "as", "at", "be", "been", "but", "by", 
  "called", "can", "come", "could", "day", "did", "do", "down", "each", "find", "first", 
  "for", "from", "get", "go", "had", "has", "have", "he", "her", "him", "his", "how", 
  "I", "if", "in", "into", "is", "it", "its", "like", "long", "look", "made", "make", 
  "many", "may", "more", "my", "no", "not", "now", "number", "of", "on", "one", "or", 
  "other", "out", "part", "people", "said", "see", "she", "so", "some", "than", "that", 
  "the", "their", "them", "then", "there", "these", "they", "this", "time", "to", "two", 
  "up", "use", "was", "water", "way", "we", "were", "what", "when", "which", "who", 
  "will", "with", "words", "would", "write", "you", "your"
};

int currentWordCount = 100;

void setup()
{
  randomSeed(analogRead(0));
  pinMode(groundPin1, OUTPUT);
  digitalWrite(groundPin1, LOW);
  pinMode(groundPin2, OUTPUT);
  digitalWrite(groundPin2, LOW);
  pinMode(switchPin, INPUT_PULLUP);
  pinMode(removeWordPin, INPUT_PULLUP);
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Sightwords");
  lcd.setCursor(0,1);
  lcd.print("By Alex Clark");
}


void loop()
{
  //switchPin and removeWordPin are normally high until and unless the button is pressed
  if (digitalRead(switchPin) == LOW && one_at_a_time == 0) {
  randomIndex = random(0, currentWordCount);

  delay(750 );
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(vocabulary[randomIndex]);
  removeIndex = randomIndex;
  one_at_a_time = 1;
  }
  if (digitalRead(switchPin) == HIGH) {
    one_at_a_time = 0;
  }
  if (digitalRead(removeWordPin) == LOW && one_at_a_time == 0 && currentWordCount != 0) {
      // code to remove using removeIndex goes here and decrement wordcount goes here
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Removed " + vocabulary[removeIndex]);
      delay(3000);
      //shift elements one to the left
      for (int i = removeIndex; i < currentWordCount - 1; i++)
      {
        vocabulary[i] = vocabulary[i + 1];
      }
      //decriment the word count by 1
      vocabulary[currentWordCount -1 ] = "";
      currentWordCount = currentWordCount - 1;
  }
  if (currentWordCount == 0) {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("No more words!");
  }
}