fixup

sensors.py

@@ -28,15 +28,13 @@ class GPIOState(Sensor):
     def __init__(self, pin, transform=lambda x: 1-x):
         self.pin = pin
         self.transform = transform
-        
-        self.value = GPIO.input(self.pin)
-        self.update_time()
-
-    def update_time(self):
-        self.time = perf_counter()
 
     def read(self):
-        self.value = GPIO.input(self.pin)
+        try:
+            self.value = GPIO.input(self.pin)
+        except:
+            self.value = None
+        self.time = perf_counter()
         
         return (self.time, self.transform(self.value))