#include <LiquidCrystal_I2C.h>
#include <math.h>


LiquidCrystal_I2C lcd(0x27, 16, 2);

  const float GAMMA = 0.7;
  const float RL10 = 50;

byte L_E[] = {
B01111,
B10000,
B10000,
B11111,
B10000,
B10000,
B01111,
B00000
};

byte L_N[] = {
B10001,
B10001,
B10001,
B11111,
B10001,
B10001,
B10001,
B00000
};

int ledPin = 5;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;   


void setup() {
  // put your setup code here, to run once:
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare sensor as input
  lcd.begin(16, 2);
  lcd.createChar(0, L_E);
  lcd.createChar(1, L_N);
  lcd.setCursor(0,0);
  lcd.print("     Lab 3");
  lcd.setCursor(0,1);
  lcd.print("17:");
  lcd.print("MYCI");
  lcd.write(0);
  lcd.write(1);
  lcd.print("KO I.C.");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
}

void loop() {
  // put your main code here, to run repeatedly:
  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  lcd.print("LUX:");
  lcd.print(lux);
  lcd.setCursor(0,1);
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
    if (pirState == LOW) {
      // we have just turned on
      lcd.print("Motion DET");
      // We only want to print on the output change, not state
      pirState = HIGH;
      delay(1000);
      
    }
    delay(1000);
  } else {
    digitalWrite(ledPin, LOW); // turn LED OFF
    if (pirState == HIGH) {
      // we have just turned of
      lcd.print("no motion");
      // We only want to print on the output change, not state
      pirState = LOW;
      delay(1000);
    }
    delay(1000);
  }
  
  lcd.clear();
  

}