#include "DHT.h"
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

#define green   25
#define yellow  26
#define red     27
#define led      2
#define kuning  18
#define DHTPIN  19     
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(led,OUTPUT);
  pinMode(kuning,OUTPUT);
  pinMode(red,OUTPUT);
  pinMode(yellow,OUTPUT);
  pinMode(green,OUTPUT);
  
  lcd.backlight(); lcd.init();
  lcd.setCursor(0,0); lcd.print("  JAM DIGITAL  ");
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  dht.begin();
}

void loop() {
  if(Serial.available()) {
    char input_serial = Serial.read();
    if(input_serial == 'a') {
      digitalWrite(kuning,HIGH);
      lcd.setCursor(9,1); lcd.print("K = ON ");
    }
    else if(input_serial == 'B') {
      digitalWrite(kuning,LOW);
      lcd.setCursor(9,1); lcd.print("K = OFF");
    }
  }
  digitalWrite(led,HIGH); 
  lcd.setCursor(0,1); lcd.print("LED ON ");
  delay(500);
  digitalWrite(led,LOW); 
  lcd.setCursor(0,1); lcd.print("LED OFF");
  delay(500);
  
  int   h = dht.readHumidity();
  float t = dht.readTemperature();
  lcd.setCursor(0,0); 
  lcd.print("T="); lcd.print(t,1); lcd.write(223); lcd.print("C   ");
  lcd.print("H="); lcd.print(h); lcd.print("% ");
  if(t<30) {
    digitalWrite(green,HIGH); 
    digitalWrite(yellow,LOW);
    digitalWrite(red,LOW);
  }
  else if(t>=30 && t<=40) {
    digitalWrite(green,LOW); 
    digitalWrite(yellow,HIGH);
    digitalWrite(red,LOW);
  }
  else {
    digitalWrite(green,LOW); 
    digitalWrite(yellow,LOW);
    digitalWrite(red,HIGH);
  }

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.println(F("°C "));
}