/*
  Arduino | general-help
  Andriska — 3:47 PM Friday, January 2, 2026
  Someone help please
*/

#include <DHT.h>

#define DHTTYPE DHT22

const int DHT_PIN = 10;
const int LED_PINS[] = {4, 3, 2};
// room temperature in Celsius
const float baselineTemp = 20.0;

DHT dht(DHT_PIN, DHTTYPE);

void turnAllOff() {
  for (int i = 0; i < 3; i++) {
    digitalWrite(LED_PINS[i], LOW);
  }
}

void setup()  {
  // open a serial connection to display values
  Serial.begin(9600);
  // start DHT sensor
  dht.begin();
  // set the LED pins as outputs
  for (int numLed = 0; numLed < 3; numLed++)  {
    pinMode(LED_PINS[numLed], OUTPUT);
  }
}

void loop() {
  // read the temperature from the DHT sensor
  float temperature = dht.readTemperature(); // Celsius

  // check if reading failed
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temperature, 1);
  Serial.println("°C");

  turnAllOff();

  // if the current temperature is lower than the baseline turn off all LEDs
  if (temperature < baselineTemp + 2) {
    turnAllOff();
  }  // else if the temperature rises 2-4 degrees, turn an LED on
  else if (temperature >= baselineTemp + 2 && temperature < baselineTemp + 4) {
    digitalWrite(LED_PINS[0], HIGH);
  }  // else if the temperature rises 4-6 degrees, turn a second LED on
  else if (temperature >= baselineTemp + 4 && temperature < baselineTemp + 6) {
    digitalWrite(LED_PINS[1], HIGH);
  }  // if the temperature rises more than 6 degrees, turn all LEDs on
  else if (temperature >= baselineTemp + 6) {
    digitalWrite(LED_PINS[2], HIGH);
  }

  // DHT11 requires slow sampling rate
  delay(2000);
}