#include <WiFi.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* host = "api.thingspeak.com";
const char* apiKey = "IUTTRGKR2CVSPS23";

const int sensorPin = 34; // Pin untuk potensiometer
const int ledPin = 2; // Pin LED
const int buzzerPin = 4; // Pin Buzzer
const float threshold = 35.0; // Ambang batas kecepatan angin

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  
  pinMode(sensorPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  connectWiFi();
}

void loop() {
  float sensorValue = analogRead(sensorPin);
  float voltage = sensorValue * (5.0 / 4095.0); // Konversi nilai sensor menjadi tegangan (0 - 5V)
  float windSpeed = mapFloat(voltage, 0.0, 5.0, 0.0, 100.0); // Konversi tegangan menjadi kecepatan angin (0 - 100 mph)

  lcd.setCursor(0, 0);
  lcd.print("Kecepatan Angin:");
  lcd.setCursor(0, 1);
  lcd.print(windSpeed);
  lcd.print(" kph     ");

  if (windSpeed > threshold) {
    digitalWrite(ledPin, HIGH);
    tone(buzzerPin, 1000); // Nada 1000Hz
  } else {
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin);
  }

  sendToThingspeak(windSpeed);

  delay(1000); // Delay 1 detik antara pembacaan nilai
}

void connectWiFi() {
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWiFi connected");
}

void sendToThingspeak(float value) {
  WiFiClient client;

  if (!client.connect(host, 80)) {
    Serial.println("Connection to Thingspeak failed");
    return;
  }

  String url = "/update?api_key=";
  url += apiKey;
  url += "&field1=";
  url += String(value);

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "Connection: close\r\n\r\n");

  delay(1000);

  while (client.available()) {
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }

  client.stop();
}

float mapFloat(float x, float in_min, float in_max, float out_min, float out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}