#include <DHTesp.h>
#include <LiquidCrystal_I2C.h>
#define DHTPIN 15
#define LDR_PIN 36

const int pinLed_red = 23;
const int pinLed_yellow = 19;
const int pinLed_green = 18;

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);
DHTesp dht;

int lightValue = 0;
const float GAMMA = 0.7;
const float RL10 = 50;
float RLDR;
float Vout;
float Lux = 0;

void setup() {
  Serial.begin(115200);
  setupLCD();
  dht.setup(DHTPIN, DHTesp::DHT22);
  setupPinLED();
}

void loop() {
  cekSuhuRuangan();
  sensorCahaya();
  delay(1000);
}

void setupPinLED(){
  pinMode(pinLed_red, OUTPUT);
  pinMode(pinLed_yellow, OUTPUT);
  pinMode(pinLed_green, OUTPUT);
}

void setupLCD(){
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Loading...");
  delay(2000);
  LCD.clear();
}

void cekSuhuRuangan(){
  TempAndHumidity data = dht.getTempAndHumidity();

  float temp = data.temperature;
  Serial.println("Temperature = "+ String(temp));
  LCD.setCursor(0, 0);
  LCD.print("Suhu: "+String(temp)+"   ");
  delay(1000);
  LCD.clear();

  if (temp < 30){
    digitalWrite(pinLed_green, HIGH);
    digitalWrite(pinLed_yellow, LOW);
    digitalWrite(pinLed_red, LOW);
    LCD.setCursor(0, 0);
    LCD.print("LED ON: Green");
  }
  else if (temp >= 30 && temp <= 50) {
    digitalWrite(pinLed_green, LOW);
    digitalWrite(pinLed_yellow, HIGH);
    digitalWrite(pinLed_red, LOW);
    LCD.setCursor(0, 0);
    LCD.print("LED ON: Yellow");
  }
  else {
    digitalWrite(pinLed_green, LOW);
    digitalWrite(pinLed_yellow, LOW);
    digitalWrite(pinLed_red, HIGH);
    LCD.setCursor(0, 0);
    LCD.print("LED ON: Red");
  }
  delay(1000);
}

void sensorCahaya(){

  lightValue = analogRead(LDR_PIN);
  float voltage = lightValue / 4095. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  Serial.print("LDR result Analog: ");
  Serial.print(lightValue);
  Serial.print(" \tLux: ");
  Serial.println(lux);
  LCD.setCursor(0, 1);
  LCD.print("Lux: "+String(lux));
}