#include <LiquidCrystal.h>
const float GAMMA = 1.2;
const float RL10 = 20.0;

int itera = 0;

byte light[8] = {
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111,
  B11111
};

byte dark[8] = {
  B11111,
  B10001,
  B10001,
  B10001,
  B10001,
  B10001,
  B10001,
  B11111
};

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
void setup() {
  // put your setup code here, to run once:
    Serial.begin(115200);
    lcd.begin(16, 2);
    pinMode(2, INPUT);
    lcd.createChar(1, light);
    lcd.createChar(2, dark);
    lcd.setCursor(0,0);
    lcd.noAutoscroll();
}

void loop() 
{
  // Convert the analog value into lux value:
  int analogValue = analogRead(A0);
  float voltage = float(analogValue) / 1024.0 * 5.0;
  float resistance = 2000.0 * voltage / (1.0 - voltage / 5.0);
  float lux = pow(RL10 * 1e3 * pow(10.0, GAMMA) / resistance, (1.0 / GAMMA));
  if(lux >= 1)
  {
    lcd.setCursor(itera,0);

    if(lux >= 20.00)
    {
      lcd.setCursor(itera,0);
      lcd.write(byte(1));
      lcd.setCursor(0,1);
      lcd.print("Light");
    }
    else
    {
      lcd.setCursor(itera,0);
      lcd.write(byte(2));
      lcd.setCursor(0,1);
      lcd.print("Dark!");
    }
  }
  else
  {
    lcd.clear();
    lcd.setCursor(0,1);
    lcd.print("Sensor Off.");
    lcd.print(itera);
    delay(500);
  }

  delay(1000);
  itera = itera + 1;



int digVal = digitalRead(2);

if (digVal == 1)
{
  itera = 0;
  lcd.setCursor(0,1);
  lcd.print("New Letter!");
  lcd.print(digVal);

  delay(3000);
  lcd.clear();
}
else
{

  delay(100);

}
  
}