Explicitly set relay open and close states

main.py

@@ -17,8 +17,10 @@ from signal import *
 
 import secrets
 
-
 RELAY_PIN = 17
+RELAY_CLOSE = GPIO.LOW
+RELAY_OPEN = GPIO.HIGH
+
 RFID_EN_PIN = 27
 CARDS_FILE = 'card_data.json'
 OPEN_DURATION = 4
@@ -26,17 +28,17 @@ OPEN_DURATION = 4
 ser = None
 
 def unlock_door():
-    GPIO.output(RELAY_PIN, GPIO.HIGH)
+    GPIO.output(RELAY_PIN, RELAY_CLOSE)
     GPIO.output(RFID_EN_PIN, GPIO.HIGH)
 
     time.sleep(OPEN_DURATION)
 
-    GPIO.output(RELAY_PIN, GPIO.LOW)
+    GPIO.output(RELAY_PIN, RELAY_OPEN)
     GPIO.output(RFID_EN_PIN, GPIO.LOW)
 
 def lock_door_on_exit(*args):
     logging.info('Exiting, locking door...')
-    GPIO.output(RELAY_PIN, GPIO.LOW)
+    GPIO.output(RELAY_PIN, RELAY_OPEN)
     GPIO.output(RFID_EN_PIN, GPIO.LOW)
     os._exit(0)
 
@@ -46,12 +48,12 @@ def init():
     GPIO.setwarnings(False)
     GPIO.setmode(GPIO.BCM)
     GPIO.setup(RELAY_PIN, GPIO.OUT)
-    GPIO.output(RELAY_PIN, GPIO.LOW)
+    GPIO.output(RELAY_PIN, RELAY_OPEN)
     GPIO.setup(RFID_EN_PIN, GPIO.OUT)
     GPIO.output(RFID_EN_PIN, GPIO.LOW)
     logging.info('GPIO initialized')
 
-    ser = serial.Serial(port='/dev/ttyAMA0', baudrate=secrets.BAUD_RATE, timeout=0.05)
+    ser = serial.Serial(port='/dev/ttyAMA0', baudrate=secrets.BAUD_RATE, timeout=0.06)
     logging.info('Serial initialized')
 
     for sig in (SIGABRT, SIGILL, SIGINT, SIGSEGV, SIGTERM):