#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>
#include "ThingSpeak.h"


Servo servo;

const char* ssid = "Wokwi-GUEST"; // your network SSID (name)
const char* password = ""; // your network password
WiFiClient client;

unsigned long myChannelNumber = 2571626;
const char * myWriteAPIKey = "VJOVI09VYFOELFCK";

#define DHT_PIN 2       // Pin data sensor DHT22 terhubung ke pin 2 pada ESP32
#define DHT_TYPE DHT22  // Jenis sensor DHT22
#define POT_PIN 34      // Pin analog potensiometer terhubung ke pin 34 pada ESP32

DHT dht(DHT_PIN, DHT_TYPE);
LiquidCrystal_I2C lcd(0x27, 16, 4);
// WidgetLCD lcd1(V3); 

const int ledMerah = 13;
const int ledKuning = 12;
const int ledHijau = 14;

const int servoPin = 18;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  dht.begin();

  WiFi.mode(WIFI_STA);
  if(WiFi.status() != WL_CONNECTED){
    Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED ){
      WiFi.begin(ssid, password);
      delay(1000);
    }
    Serial.println("\nConnected. ");
  }

  servo.attach(servoPin);
  ThingSpeak.begin(client); // Initialize ThingSpeak

}

void loop() {

  delay(2000);  // Tunda 2 detik antara pembacaan nilai

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  pinMode(POT_PIN, INPUT);

  pinMode(ledMerah, OUTPUT);
  pinMode(ledHijau, OUTPUT);
  pinMode(ledKuning, OUTPUT);

  // Periksa apakah pembacaan suhu dan kelembaban berhasil
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Gagal membaca sensor DHT22!");
    return;
  }

  Serial.print("Suhu: ");
  Serial.print(temperature);
  Serial.print(" °C\t");
  Serial.print("Kelembaban: ");
  Serial.print(humidity);
  Serial.println(" %");

  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(temperature);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Kelembaban: ");
  lcd.print(humidity);
  lcd.print(" %");

  // Baca nilai potensiometer
  int potValue = analogRead(POT_PIN);

  // Konversi nilai potensiometer menjadi nilai pH
  float ph = map(potValue, 0, 4095, 1, 100);

  // Tampilkan nilai potensiometer pada Serial Monitor
  Serial.print("PH: ");
  Serial.println(ph);

  // Tampilkan nilai potensiometer pada LCD
  lcd.setCursor(0, 2);
  lcd.print("PH: ");
  lcd.print(ph);
  lcd.print(" ");

  if (ph < 7) {
    digitalWrite(ledHijau, HIGH);
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledKuning, LOW);
    lcd.setCursor(0, 3);
    lcd.print("                     ");
    lcd.setCursor(0, 3);
    lcd.print("Basa");
  } else if (ph == 7) {
    digitalWrite(ledHijau, LOW);
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledKuning, HIGH);
    lcd.setCursor(0, 3);
    lcd.print("                     ");
    lcd.setCursor(0, 3);
    lcd.print("Normal");
  } else if (ph > 7 ) {
    digitalWrite(ledHijau, LOW);
    digitalWrite(ledMerah, HIGH);
    digitalWrite(ledKuning, LOW);
    lcd.setCursor(0, 3);
    lcd.print("                     ");
    lcd.setCursor(0, 3);
    lcd.print("Asam");
  }

  if (humidity > 25 && temperature > 25) {
    servo.write(180);
  } else {
    servo.write(0);
  }
    
    ThingSpeak.setField(1, ph);
    ThingSpeak.setField(2, temperature);
    ThingSpeak.setField(3, humidity);

    int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey );
    if(x == 200){
      Serial.println("Channel update successful." );
    }
    else{
      Serial.println("Problem updating channel. HTTP error code " + String(x) );
    }
  delay(15000);
}