fix: use physical pin numbers

- Changed GPIO mode from BCM to BOARD
- Now using physical pin numbers (15 for relay, 7 for status)
- Updated pin documentation
- Made logging clearer about physical pin numbers

backend/main.py

@@ -38,8 +38,8 @@ class MQTTSettings(BaseModel):
     enabled: bool = False
 
 class GPIOSettings(BaseModel):
-    gatePin: int = 15  # Relay control pin
-    statusPin: int = 7  # Gate open status pin
+    gatePin: int = 15  # Physical Pin 15 - Relay control pin
+    statusPin: int = 7  # Physical Pin 7 - Gate open status pin
 
 class LoggingSettings(BaseModel):
     level: str = "INFO"  # Default to INFO level
@@ -550,7 +550,7 @@ app.mount("/", StaticFiles(directory="../public", html=True), name="static")
 def setup_gpio():
     """Initialize GPIO pins based on settings"""
     GPIO.setwarnings(False)
-    GPIO.setmode(GPIO.BCM)
+    GPIO.setmode(GPIO.BOARD)  # Use physical pin numbers instead of BCM
     
     try:
         settings = app.state.current_settings
@@ -567,7 +567,7 @@ def setup_gpio():
         status_pin = settings.gpio.statusPin
         GPIO.setup(status_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
         
-        logger.info(f"GPIO initialized (Gate Pin: {gate_pin}, Status Pin: {status_pin})")
+        logger.info(f"GPIO initialized (Gate Pin: Physical {gate_pin}, Status Pin: Physical {status_pin})")
     except Exception as e:
         logger.error(f"Failed to setup GPIO: {e}", exc_info=True)
         raise