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-Debouncing a pin input
-======================
-
-A pin used as input from a switch or other mechanical device can have a lot
-of noise on it, rapidly changing from low to high when the switch is first
-pressed or released.  This noise can be eliminated using a capacitor (a
-debouncing circuit).  It can also be eliminated using a simple function that
-makes sure the value on the pin is stable.
-
-The following function does just this.  It gets the current value of the given
-pin, and then waits for the value to change.  The new pin value must be stable
-for a continuous 20ms for it to register the change.  You can adjust this time
-(to say 50ms) if you still have noise. ::
-
-    import pyb
-
-    def wait_pin_change(pin):
-        # wait for pin to change value
-        # it needs to be stable for a continuous 20ms
-        cur_value = pin.value()
-        active = 0
-        while active < 20:
-            if pin.value() != cur_value:
-                active += 1
-            else:
-                active = 0
-            pyb.delay(1)
-
-
-Use it something like this::
-
-    import pyb
-
-    pin_x1 = pyb.Pin('X1', pyb.Pin.IN, pyb.Pin.PULL_DOWN)
-    while True:
-        wait_pin_change(pin_x1)
-        pyb.LED(4).toggle()