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

#define TRIG_PIN 2          
#define ECHO_PIN 4          
#define DHTPIN 14           
#define DHTTYPE DHT22       
const char* ssid = "Wokwi-GUEST";
const char* pass = "";
WiFiClient client;
DHT dht(DHTPIN, DHTTYPE);

const int rs = 21, en = 22, d4 = 19, d5 = 18, d6 = 5, d7 = 23;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const int ledPin = 15; 
unsigned long myChannelNumber = 2610899;
const char * myWriteAPIKey = "3GJIPRBBQZIVORJN";
void setup() {
  Serial.begin(115200);
  lcd.begin(16, 2);
  lcd.print("Initializing...");
  pinMode(ledPin, OUTPUT);
  dht.begin();
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
  Serial.println("WiFi connected");
  lcd.clear();
  lcd.print("Setup Complete");
  ThingSpeak.begin(client);
  delay(2000);
}

long readUltrasonicDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  long duration = pulseIn(ECHO_PIN, HIGH);
  long distance = duration * 0.034 / 2;
  return distance;
}

void loop() {
  lcd.clear();
  long distance = readUltrasonicDistance();
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  String ledStatus = "OFF";
  if (distance > 200 & temperature > 39) {
    digitalWrite(ledPin, HIGH);
    ledStatus = "ON";
  } else {
    digitalWrite(ledPin, LOW);
    ledStatus = "OFF";
  }

  lcd.setCursor(0, 0);
  lcd.print("D:");
  lcd.print(distance);
  lcd.print("cm T:");
  lcd.print(temperature);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("H:");
  lcd.print(humidity);
  lcd.print("% W:");
  lcd.print(ledStatus);

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print(" cm, Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Water Status: ");
  Serial.println(ledStatus);

  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, distance);
  ThingSpeak.setField(3, humidity);
  ThingSpeak.setField(4, ledStatus);
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
    
  if (x == 200) {
      Serial.println("Data sent successfully.");
 } else {
      Serial.println("Failed to send data.");
  }

    // Wait before the next loop
    delay(2000);
}