#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <ThingSpeak.h>

// Ultrasonic sensor
#define TRIG_PIN 18
#define ECHO_PIN 5
// DHT sensor
#define DHTPIN 19
#define DHTTYPE DHT22
// LED
#define LED_RED 4
#define LED_GREEN 2

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 20, 4);

// WiFi & ThingSpeak
WiFiClient client;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int channelId = 2720192;
const char* apiKey = "OGLT9NG5M0BLXYEK";
//const char* server = "api.thingspeak.com";

void setup() {
  Serial.begin (9600);
  // Ultrasonic sensor setup
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  // DHT sensor setup
  dht.begin();
  // pin LED
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  // LCD setup
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Data sensor:");
  // WiFi setup
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while(WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("WiFi: Waiting for connection!");
  }
  Serial.println("WiFi: Connected!");
  WiFi.mode(WIFI_STA);
  // ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  Serial.println("--- looping ---");
  // sinyal trigger ultrasonic sensor
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  // mengukur durasi pulsa dan konversi ke jarak
  float pulse_duration = pulseIn(ECHO_PIN, HIGH);
  float distance_cm = 0.017 * pulse_duration;
  String strDistance_cm = String(distance_cm, 1);
  // mendapatkan data dari DHT sensor
  float humid = dht.readHumidity();
  float temp = dht.readTemperature();
  String strHumid = String(humid, 1);
  String strTemp = String(temp, 1);
  // serial print
  Serial.println("Jarak: " + strDistance_cm + "cm");
  Serial.println("Humid: " + strHumid + "%");
  Serial.println("Temp: " + strTemp + "\xDF" + "C");
  // LCD Print
  lcd.setCursor(0, 1);
  lcd.print("Temper: " + strTemp + "\xDF" + "C");
  lcd.setCursor(0, 2);
  lcd.print("Humidity: " + strHumid + "%");
  lcd.setCursor(0, 3);
  lcd.print("Jarak obj: " + strDistance_cm + "cm");
  // LED Merah terang jika temperatur lebih dari 40'C
  if(temp > 40 ){
    digitalWrite(LED_RED, HIGH);
  }else{
    digitalWrite(LED_RED, LOW);
  }
  // LED Hijau terang jika jarak kurang dari 5cm
  if(distance_cm < 10){
    digitalWrite(LED_GREEN, HIGH);
  }else{
    digitalWrite(LED_GREEN, LOW);
  }
  // Write to ThingSpeak
  ThingSpeak.setField(1, temp);
  ThingSpeak.setField(2, humid);
  ThingSpeak.setField(3, distance_cm);
  int x = ThingSpeak.writeFields(channelId, apiKey);
  if(x == 200){
    Serial.println("Data uploaded successfully!");
  }else{
    Serial.println("Error while uploading data!");
  }
  delay(1000);
}