import sys & waitkey

main.py

@@ -3,6 +3,7 @@ from time import sleep
 from io import BytesIO
 import os
 import serial
+import sys
 
 try:
     import numpy as np
@@ -11,6 +12,7 @@ try:
     
 except Exception as ex:
     print('[ Error ] some depandincies are missing\n'+ str(ex.args))
+    sys.exit()
 
 def init():
 	go = True
@@ -62,7 +64,7 @@ def start( camera, face_cascade):
 			cv2.putText(img, person, (x, y), cv2.FONT_HERSHEY_PLAIN, 1.7, (255, 0, 0), 2)
 			
 		cv2.imshow('image',img) 
-		cv2.waitKey(10)
+		cv2.waitKey(100)
 		if cv2.waitKey(1) & 0xFF == ord('q'):
 			cv2.destroyAllWindows()
 			break
@@ -119,5 +121,4 @@ def OpenShifter():
 		print('[ Error ] Can not connect to Arduino at /dev/ttyUSB1 ..')
 
 
-
 init()