#define LDR_PIN 2

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

int ledPin = 13;
int inputPin = 2;
int pirState = LOW;
int val = 0;

void setup() {
pinMode(ledPin, OUTPUT);
pinMode(inputPin, INPUT);
pinMode(LDR_PIN, INPUT);

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));

if (lux < 50) {
  val = digitalRead(inputPin);
if (val == HIGH) {
  digitalWrite(ledPin, HIGH);
  if (pirState == LOW) {
    Serial.println("Motion detected");
    pirState = HIGH;
  }
} else {
  digitalWrite(ledPin, LOW);
  if (pirState == HIGH) {
    Serial.println("Motion ended!");
    pirState =LOW;
  }
}
}

delay(100);
}