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-The accelerometer
-=================
-
-Here you will learn how to read the accelerometer and signal using LEDs states like tilt left and tilt right.
-
-Using the accelerometer
------------------------
-
-The pyboard has an accelerometer (a tiny mass on a tiny spring) that can be used
-to detect the angle of the board and motion. There is a different sensor for
-each of the x, y, z directions. To get the value of the accelerometer, create a
-pyb.Accel() object and then call the x() method. ::
-
-    >>> accel = pyb.Accel()
-    >>> accel.x()
-    7
-
-This returns a signed integer with a value between around -30 and 30. Note that
-the measurement is very noisy, this means that even if you keep the board
-perfectly still there will be some variation in the number that you measure.
-Because of this, you shouldn't use the exact value of the x() method but see if
-it is in a certain range.
-
-We will start by using the accelerometer to turn on a light if it is not flat. ::
-
-    accel = pyb.Accel()
-    light = pyb.LED(3)
-    SENSITIVITY = 3
-
-    while True:
-        x = accel.x()
-        if abs(x) > SENSITIVITY: 
-            light.on()
-        else:
-            light.off()
-
-        pyb.delay(100)
-
-We create Accel and LED objects, then get the value of the x direction of the
-accelerometer. If the magnitude of x is bigger than a certain value ``SENSITIVITY``,
-then the LED turns on, otherwise it turns off. The loop has a small ``pyb.delay()``
-otherwise the LED flashes annoyingly when the value of x is close to
-``SENSITIVITY``. Try running this on the pyboard and tilt the board left and right
-to make the LED turn on and off.
-
-**Exercise: Change the above script so that the blue LED gets brighter the more
-you tilt the pyboard.  HINT: You will need to rescale the values, intensity goes
-from 0-255.**
-
-Making a spirit level
----------------------
-
-The example above is only sensitive to the angle in the x direction but if we
-use the ``y()`` value and more LEDs we can turn the pyboard into a spirit level. ::
-
-    xlights = (pyb.LED(2), pyb.LED(3))
-    ylights = (pyb.LED(1), pyb.LED(4))
-
-    accel = pyb.Accel()
-    SENSITIVITY = 3
-
-    while True:
-        x = accel.x()
-        if x > SENSITIVITY: 
-            xlights[0].on()
-            xlights[1].off()
-        elif x < -SENSITIVITY:
-            xlights[1].on()
-            xlights[0].off()
-        else:
-            xlights[0].off()
-            xlights[1].off()
-
-        y = accel.y()
-        if y > SENSITIVITY: 
-            ylights[0].on()
-            ylights[1].off()
-        elif y < -SENSITIVITY:
-            ylights[1].on()
-            ylights[0].off()
-        else:
-            ylights[0].off()
-            ylights[1].off()
-
-        pyb.delay(100)
-
-We start by creating a tuple of LED objects for the x and y directions. Tuples
-are immutable objects in python which means they can't be modified once they are
-created. We then proceed as before but turn on a different LED for positive and
-negative x values. We then do the same for the y direction. This isn't
-particularly sophisticated but it does the job. Run this on your pyboard and you
-should see different LEDs turning on depending on how you tilt the board.