#include <LiquidCrystal_I2C.h>

#define LED 2
#define LED1 4

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

//PIR
int inputPin = 3;
int pirState = LOW;
int val = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // put your setup code here, to run once:
  pinMode(LED1, OUTPUT);
  pinMode(inputPin, INPUT);

  Serial.begin(9600);

  lcd.init();
  lcd.backlight();
}

void loop() {
  // put your main code here, to run repeatedly:
  
  //PIR
  val = digitalRead(inputPin);
  if (val == HIGH) {
    digitalWrite(LED1, HIGH);
    if (pirState == LOW) {
    Serial.println("Gerakan Terdeteksi!");
    pirState = HIGH;
  }
 } else {
  digitalWrite(LED1, LOW);
  if (pirState == HIGH) {
    Serial.println("Tidak Ada Gerakan!");
    pirState = LOW;
  }
 }
  
  //LDR & LCD
  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.setCursor(2, 0);
  lcd.print("Cahaya: ");
  if (lux > 50) {
    lcd.print("Terang!");
    digitalWrite(LED, LOW);
  } else {
    lcd.print("Gelap ");
    digitalWrite(LED, HIGH);
  }

  lcd.setCursor(0, 1);
  lcd.print("lux: ");
  lcd.print(lux);
  lcd.print("     ");

  delay(100);

}