#include <Wire.h>
#include <DHT.h>

/* ----------------------------------------------------
   DHT SENSOR CONFIGURATION
   ---------------------------------------------------- */
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

/* ----------------------------------------------------
   SLIDE SWITCH CONFIGURATION
LOW  = Celsius
HIGH = Fahrenheit
   ---------------------------------------------------- */
#define SWITCH_PIN 4


/* ----------------------------------------------------
   SETUP FUNCTION
   Runs once when the board starts
   ---------------------------------------------------- */
void setup() {
  // Start Serial Monitor
  Serial.begin(9600);
  // Initialize DHT sensor
  dht.begin();
  // Set slide switch pin as input
  pinMode(SWITCH_PIN, INPUT);
}

/* ----------------------------------------------------
   LOOP FUNCTION
   Runs continuously
   ---------------------------------------------------- */
void loop() {
  /* -------- Read sensor values -------- */
  float temperatureC = dht.readTemperature(); // Celsius
  float humidity = dht.readHumidity();

  // Check if sensor reading failed
  if (isnan(temperatureC) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor");
    return;
  }

  /* -------- Read slide switch state -------- */
  int switchState = digitalRead(SWITCH_PIN);

  /* -------- Temperature unit logic -------- */
  float displayedTemperature;
  String temperatureUnit;

  // If switch is LOW → Celsius
  if (switchState == LOW) {
    displayedTemperature = temperatureC;
    temperatureUnit = "C";
  }
  // If switch is HIGH → Fahrenheit
  else {
    displayedTemperature = (temperatureC * 9.0 / 5.0) + 32.0;
    temperatureUnit = "F";
  }

  /* -------- Serial Monitor Output -------- */
  Serial.print("Temp: ");
  Serial.print(displayedTemperature);
  Serial.print(" ");
  Serial.print(temperatureUnit);
  Serial.print(" | Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Wait before next update
  delay(2000);
}