add CORS

run.py

@@ -483,18 +483,20 @@ def get_sensors():
                 val = val[0]
                 if val == 1 and sensors[idx] >= 0: # skip negative values
                     sensors[idx] += 1
-                else:
+                elif val == 0:
                     if sensors[idx] >= 4:
                         sensors[idx] -= 4
+                    else:
+                        sensors[idx] += 4
     else:
-        out = [0, 0, 0, 0]
+        sensors = [0, 0, 0, 0]
 
     #fprint("Values: " + str(sensors))
     #mbconn.close()
     for x in range(len(sensors)):
         if sensors[x] >= 180: # 3 sec
             # cable newly detected on tray
-            sensors[x] = -10000
+            sensors[x] = -180
             fprint("Precense detected: slot " + str(x))
             return x