Just a face and flipping the bird gesture for Arduino I2C-LCD

flipping-the-bird.ino

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

LiquidCrystal_I2C lcd(0x27, 20, 4);

int loopCtr = 0;
int direction = 0;
int x = random(0, 13);
int y = random(0, 1);
int dx = 0;
int dy = 0;

byte customChars[][8] = {
  {B00100,B00100,B00100,B01100,B11111,B11111,B11111,B01110}, // right hand
  {B00100,B00100,B00100,B00110,B11111,B11111,B11111,B01110}, // left hand
  {B11000,B01100,B00110,B00000,B00000,B00000,B00001,B00001}, // left eye
  {B00000,B00000,B00000,B00000,B00000,B00000,B10001,B10001}, // mid eye
  {B00011,B00110,B01100,B00000,B00000,B00000,B10000,B10000}, // right eye
  {B00000,B00000,B00000,B00000,B00000,B01000,B00100,B00011}, // left mouth
  {B00000,B00100,B00100,B00100,B00000,B00000,B00000,B11111}, // mid mouth
  {B00000,B00000,B00000,B00000,B00000,B00010,B00100,B11000}  // right mouth
};

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.clear();

  for (int i = 0; i < 8; i++)
    lcd.createChar(i, customChars[i]);
}

int clamp(int value, int min, int max) {
  if(value < min) return min;
  if(value > max) return max;
  return value;
}

void drawFace(int x, int y) {
  int ch = 2;
  for(int col = y; col < y+2; col++)
    for(int row = x+2; row < x+5; row++){
      lcd.setCursor(row, col);
      lcd.write(byte(ch));
      ch++;
    }
}

void drawHands(int x, int y, bool leftUp) {
  if(leftUp){
    lcd.setCursor(x, y+1);
    lcd.write(byte(0));
    lcd.setCursor(x+6, y+2);
    lcd.write(byte(1));
  }else{
    lcd.setCursor(x, y+2);
    lcd.write(byte(0));
    lcd.setCursor(x+6, y+1);
    lcd.write(byte(1));
  }
}

void loop() {

  if(loopCtr > 3) {
    loopCtr = 0;
    direction = random(0,4);
  }

  switch(direction) {
    case 0:
      dx = 1; dy = 0;
      break;
    case 1:
      dx = -1; dy = 0;
      break;
    case 2:
      dx = 0; dy = 1;
      break;
    case 3:
      dx = 0; dy = -1;
      break;
  }

  x = clamp(x+dx, 0, 13);
  y = clamp(y+dy, 0, 1);
    
  drawFace(x, y);
  drawHands(x, y, true);
  
  delay(700);
  lcd.clear();
  
  drawFace(x, y);
  drawHands(x, y, false);
  
  delay(700);
  lcd.clear();

  loopCtr++;
}