Arduino-ai-project

#include <DHT.h>

// --- Pin setup --- #define DHT_PIN 4 #define DHT_TYPE DHT11 // Change to DHT22 if needed #define BUTTON_PIN 5 #define LED_PIN 13 // Built-in LED (test instead of fan)

// --- Globals --- DHT dht(DHT_PIN, DHT_TYPE);

bool tempControlEnabled = false; // Start OFF float tempThreshold = 10.0; // Temperature threshold in °C int lastButtonState = HIGH; // For toggle button

void setup() { Serial.begin(9600); dht.begin(); pinMode(BUTTON_PIN, INPUT_PULLUP); pinMode(LED_PIN, OUTPUT);

Serial.println("Temperature Control System Ready."); Serial.println("Press button to toggle ON/OFF."); }

void loop() { // --- Button toggle --- int buttonState = digitalRead(BUTTON_PIN); if (buttonState == LOW && lastButtonState == HIGH) { tempControlEnabled = !tempControlEnabled; Serial.print("Temp Control: "); Serial.println(tempControlEnabled ? "ON" : "OFF"); delay(200); // debounce } lastButtonState = buttonState;

// --- Read temperature --- float temp = dht.readTemperature(); if (isnan(temp)) { Serial.println("Error: Cannot read from DHT sensor!"); } else { Serial.print("Temperature: "); Serial.print(temp); Serial.println(" °C");

// --- Control logic ---
if (tempControlEnabled && temp >= tempThreshold) {
  digitalWrite(LED_PIN, HIGH); 
  Serial.println("LED ON (Temp above threshold)");
} else {
  digitalWrite(LED_PIN, LOW);  
  if (tempControlEnabled) {
    Serial.println("LED OFF (Temp below threshold)");
  }
}

}

delay(2000); // Update every 2 seconds }