// imports
#include <DHTesp.h>
#include <ESP32Servo.h>

// define pins
#define LDR_PIN 13
#define LED_PIN 23
#define DHT_PIN 26
#define SERVO_PIN 15
#define MOTION_PIN 2
#define MOTION_LED 22
#define BUZZER_PIN 21

// define base variables for modules
int mov_state = LOW;
int val = 0;
int ldr_value = 0;
int ldr_threshold = 2045;

// object for DHT22
DHTesp dhtSensor;

// object for servo
Servo servo;

// setup
void setup() {
  // brightness
  pinMode(LDR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  
  // temp sensor
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  // servo
  servo.attach(SERVO_PIN, 500, 2400);

  // motion sensor
  pinMode(MOTION_PIN, INPUT); 
  pinMode(MOTION_LED, OUTPUT);

  // buzzer
  pinMode(BUZZER_PIN, OUTPUT);
}

// main loop
void loop() {
  Serial.begin(9600);
  readLight();

  readTemp();

  motionSensor();

  delay(100);
}

// reads the brightness and writes to LED
void readLight(){
  ldr_value = analogRead(LDR_PIN); // read the value from the sensor
  Serial.println(ldr_value);
  // if light not present
  if (ldr_value > ldr_threshold) {
    digitalWrite(LED_PIN, HIGH);
  }
  // if light present
  else{
    digitalWrite(LED_PIN, LOW);
  }
}

// reads temperature and writes to servo
void readTemp(){
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  float temp = data.temperature;

  if (temp >= 25){
  servo.write(270);
    delay(15);
  } else{
    servo.write(90);
    delay(15);
  }
}

// detects motion and activates an LED and a buzzer
void motionSensor(){
  val = digitalRead(MOTION_PIN);  
  if (val == HIGH) {                // if motion is detected
    digitalWrite(MOTION_LED, HIGH); // activate LED
    digitalWrite(BUZZER_PIN, HIGH); // enable buzzer
    if (mov_state == LOW) {
      mov_state = HIGH;
    }
  } else {
    digitalWrite(MOTION_LED, LOW);
    digitalWrite(BUZZER_PIN, LOW);
    if (mov_state == HIGH) {
      mov_state = LOW;
    }
  }
}