fix: Refactor main loop for graceful shutdown and improved error handling

main.py

@@ -369,6 +369,9 @@ retry_ntp_attempts = 0
 max_ntp_attempts = 5  # Try up to 5 times after initial failure
 last_ntp_sync = time.time()  # Track when we last synced
 
+try:
+    while True:
+        
         # ===== START: Main Loop =====
         # Main monitoring loop (runs forever until Ctrl+C)
         last_monitor_run = {
@@ -461,3 +464,24 @@ while True:
             gc.collect()
             time.sleep(0.1)
         # ===== END: Main Loop =====
+except KeyboardInterrupt:
+    print("\n" + "="*50)
+    print("Shutting down gracefully...")
+    print("="*50)
+    try:
+        print("Turning off AC...")
+        ac_controller.turn_off()
+    except Exception as e:
+        print("AC shutdown error:", e)
+    try:
+        print("Turning off heater...")
+        heater_controller.turn_off()
+    except Exception as e:
+        print("Heater shutdown error:", e)
+    try:
+        print("Turning off LED...")
+        led.low()
+    except Exception as e:
+        print("LED shutdown error:", e)
+    print("Shutdown complete!")
+    print("="*50)