fix: refresh cam

led_control.py

@@ -30,7 +30,7 @@ FORMAT = ".jpg"
 PROMPT = "> "
 
 filename = None
-cam = cv2.VideoCapture(0)
+cam = cv2.VideoCapture()
 
 if not DEBUG:
     import RPi.GPIO as GPIO
@@ -105,8 +105,10 @@ def parse_s3_url_payload(payload):
 
 
 def take_picture():
+    cam.open(0)
     ret, frame = cam.read()
     ret, img = cv2.imencode(FORMAT, frame)
+    cam.release()
     return img.tobytes()