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diff --git a/docs/pyboard/tutorial/lcd_skin.rst b/docs/pyboard/tutorial/lcd_skin.rst new file mode 100644 index 0000000000..8ee31d9603 --- /dev/null +++ b/docs/pyboard/tutorial/lcd_skin.rst @@ -0,0 +1,86 @@ +The LCD and touch-sensor skin +============================= + +Soldering and using the LCD and touch-sensor skin. + +.. image:: img/skin_lcd_1.jpg + :alt: pyboard with LCD skin + :width: 250px + +.. image:: img/skin_lcd_2.jpg + :alt: pyboard with LCD skin + :width: 250px + +The following video shows how to solder the headers onto the LCD skin. +At the end of the video, it shows you how to correctly connect the LCD skin to the pyboard. + +.. raw:: html + + <iframe style="margin-left:3em;" width="560" height="315" src="http://www.youtube.com/embed/PowCzdLYbFM?rel=0" frameborder="0" allowfullscreen></iframe> + +For circuit schematics and datasheets for the components on the skin see :ref:`hardware_index`. + +Using the LCD +------------- + +To get started using the LCD, try the following at the Micro Python prompt. +Make sure the LCD skin is attached to the pyboard as pictured at the top of this page. :: + + >>> import pyb + >>> lcd = pyb.LCD('X') + >>> lcd.light(True) + >>> lcd.write('Hello uPy!\n') + +You can make a simple animation using the code:: + + import pyb + lcd = pyb.LCD('X') + lcd.light(True) + for x in range(-80, 128): + lcd.fill(0) + lcd.text('Hello uPy!', x, 10, 1) + lcd.show() + pyb.delay(25) + +Using the touch sensor +---------------------- + +To read the touch-sensor data you need to use the I2C bus. The +MPR121 capacitive touch sensor has address 90. + +To get started, try:: + + >>> import pyb + >>> i2c = pyb.I2C(1, pyb.I2C.MASTER) + >>> i2c.mem_write(4, 90, 0x5e) + >>> touch = i2c.mem_read(1, 90, 0)[0] + +The first line above makes an I2C object, and the second line +enables the 4 touch sensors. The third line reads the touch +status and the ``touch`` variable holds the state of the 4 touch +buttons (A, B, X, Y). + +There is a simple driver `here <http://micropython.org/resources/examples/mpr121.py>`_ +which allows you to set the threshold and debounce parameters, and +easily read the touch status and electrode voltage levels. Copy +this script to your pyboard (either flash or SD card, in the top +directory or ``lib/`` directory) and then try:: + + >>> import pyb + >>> import mpr121 + >>> m = mpr121.MPR121(pyb.I2C(1, pyb.I2C.MASTER)) + >>> for i in range(100): + ... print(m.touch_status()) + ... pyb.delay(100) + ... + +This will continuously print out the touch status of all electrodes. +Try touching each one in turn. + +Note that if you put the LCD skin in the Y-position, then you need to +initialise the I2C bus using:: + + >>> m = mpr121.MPR121(pyb.I2C(2, pyb.I2C.MASTER)) + +There is also a demo which uses the LCD and the touch sensors together, +and can be found `here <http://micropython.org/resources/examples/lcddemo.py>`_. |