diff --git a/cardlistener.py b/cardlistener.py
index fb9742e..34b5e6b 100755
--- a/cardlistener.py
+++ b/cardlistener.py
@@ -2,8 +2,29 @@ import time, json
 import RPi.GPIO as GPIO
 import keyboard
 import subprocess
+
+pin_config = []
+
+def btnBlink():
+	for i in range(3):
+		GPIO.output(pin_config['fridge_red_LED'], GPIO.HIGH)
+		time.sleep(0.01)
+		GPIO.output(pin_config['fridge_grn_LED'], GPIO.HIGH)
+		time.sleep(0.01)
+		GPIO.output(pin_config['tools_red_LED'], GPIO.HIGH)
+		time.sleep(0.01)
+		GPIO.output(pin_config['tools_grn_LED'], GPIO.HIGH)
+		time.sleep(0.01)
+		GPIO.output(pin_config['fridge_red_LED'], GPIO.LOW)
+		time.sleep(0.01)
+		GPIO.output(pin_config['fridge_grn_LED'], GPIO.LOW)
+		time.sleep(0.01)
+		GPIO.output(pin_config['tools_red_LED'], GPIO.LOW)
+		time.sleep(0.01)
+		GPIO.output(pin_config['tools_grn_LED'], GPIO.LOW)
+		time.sleep(0.01)
+
 if __name__ == '__main__':
-	pin_config = []
 	with open('pin_config.json') as pin_config_stream:
 		pin_config = json.load(pin_config_stream)
 	if pin_config['mode'] == 'BOARD':
@@ -68,6 +89,7 @@ if __name__ == '__main__':
 						GPIO.output(pin_config['tools_red_LED'], GPIO.LOW)
 						wait = False
 		except:
+			btnBlink()
 			print "Card not registered."
 		history = []
 		try: