#include <LiquidCrystal_I2C.h>
int ledPin = 2;
int PirPin = 3;
int pirState = LOW;
int val = 0;
#define LDRPin 2
//int lux;
const float GAMMA = 0.7;
const float RL10 = 50;
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
pinMode(ledPin, OUTPUT);
pinMode(PirPin, INPUT);
pinMode(LDRPin, INPUT);
lcd.init();
lcd.backlight();
Serial.begin(9600);

}

void loop() {
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(0,0);
val = digitalRead(PirPin);
// if (val == HIGH) {            // check if the input is HIGH
//     digitalWrite(ledPin, HIGH);  // turn LED ON
//     if (pirState == LOW) {
//       // we have just turned on
//       Serial.println("Gerakan Terdeteksi!");
//       // We only want to print on the output change, not state
//       pirState = HIGH;
//     }
//   } else {
//     digitalWrite(ledPin, LOW); // turn LED OFF
//     if (pirState == HIGH) {
//       // we have just turned of
//       Serial.println("Gerakan Berhenti!");
//       // We only want to print on the output change, not state
//       pirState = LOW;
//     }
//   }


if (lux < 100){
  lcd.print("Malam Hari");
   if(digitalRead(PirPin) == HIGH){
      lcd.setCursor(0,1);
      digitalWrite(ledPin, HIGH);
      lcd.print("Ada Gerakan");
    } 
    else {
      lcd.setCursor(0,1);
      digitalWrite(ledPin, LOW);
      lcd.print("Tidak Ada Gerakan");
    }
// }else {
// if (lux < 100){
//   lcd.print("Malam Hari");
//    if(digitalRead(PirPin) == LOW){
//       lcd.setCursor(0,1);
//       digitalWrite(ledPin, LOW);
//       lcd.print("Tidak Ada Gerakan");
//     }  
} else {
  lcd.setCursor(0, 1);
    digitalWrite(ledPin, LOW);
    lcd.setCursor(0, 0);
    lcd.print("Siang Hari");
// else {
//   if (lux < 100){
//   digitalWrite(ledPin, HIGH);
//   lcd.setCursor(0, 0);
//   lcd.print("Malam Hari");
//    if(pirState == HIGH){
//       lcd.setCursor(0,1);
//       lcd.print("Ada Gerakan");
//       pirState == LOW;
//     }
//   }
  

}
delay(500);
}