// library
#if defined(ESP8266)
#include <ESP8266WiFi.h>
#elif defined(ESP32)
#include <WiFi.h>
#endif

int ledPin = 14;                 // pin for LED
int pirPin = 13;                 // pin for PIR sensor
int pirState = LOW;              // we start, assuming no motion detected
int val = 0;                     // variable for reading the pin status

#define ldrPin 34                // pin for LDR sensor

// constanta for lux
const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {
  pinMode(ledPin, OUTPUT);       // declare LED as output
  pinMode(pirPin, INPUT);        // declare PIR sensor as input
  pinMode(ldrPin, INPUT);        // declare LDR sensor as input
  
  Serial.begin(115200);
}

void loop() {
  // declare analog to variable light
  int light = analogRead(ldrPin);
  float voltage = light / 4095. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  val = digitalRead(pirPin);                    // read input value
  if (val == HIGH && lux <= 100) {              // check if the input is HIGH and light is <= 100 lux)
    digitalWrite(ledPin, HIGH);                 // turn on the LED 
    if (pirState == LOW) {
      Serial.println("Motion detected!");
      pirState = HIGH;

      delay(10000);
    }
  } else {
    digitalWrite(ledPin, LOW);                  // turn off the LED
    if (pirState == HIGH) {
      Serial.println("Motion ended!");
      pirState = LOW;
    }
  }
}