#include "DHTesp.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ThingSpeak.h"

const int DHT_PIN = 15;
const int LDR_PIN = 32;
const int LED_PIN = 27;
const int BUZZER_PIN = 26;
const float GAMMA = 0.7;
const float RL10 = 50;

DHTesp dhtSensor;

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

String getLight(float lux) {
  if(lux < 1) {
    return "Completely Dark";
  }  else if (lux < 1000) {
     return "Normal";
  } else if (lux < 5000) {
     return "May Be Fire";
  } else if (lux < 10000) {
     return "Fire!!!";
  } else if (lux < 100000) {
     return "Massive Fire!!!";
  } 
}

void loop() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  float temprature = data.temperature;
  float humidity = data.humidity;

  float analogValue = analogRead(LDR_PIN) / 4;
  Serial.println(analogValue);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("lux: " + String(lux,0) + "LM");
  Serial.println(getLight(lux));
  Serial.println("---");

  if(temprature > 60 && humidity > 55 && lux > 1500) {
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 100, 1000);
    delay(2000);
    digitalWrite(LED_PIN, LOW);
  } else {
    tone(BUZZER_PIN, 0);
    digitalWrite(LED_PIN, LOW);
  }
  
  ThingSpeak.setField(1, humidity);
  ThingSpeak.setField(2, temprature);
  ThingSpeak.setField(3, lux);
  delay(1000);
}