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Merge pull request #107 from rhempel/update-readme-content
Initial pass at expanding the README for this project - Fixes #104
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‎README.rst‎

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@@ -5,9 +5,171 @@ Python language bindings for ev3dev
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:target: https://travis-ci.org/rhempel/ev3dev-lang-python
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.. image:: https://readthedocs.org/projects/python-ev3dev/badge/?version=latest
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:target: http://python-ev3dev.readthedocs.org/en/latest/?badge=latest
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:alt: Documentation Statu
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:alt: Documentation Status
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This is a python library implementing unified interface for ev3dev_ devices.
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A Python library implementing unified interface for ev3dev_ devices.
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.. _ev3dev: http://ev3dev.org
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Example Code
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------------
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To run these minimal examples, run the Python interpreter from
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the terminal like this:
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.. code-block:: bash
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robot@ev3dev:~$ python
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Python 2.7.9 (default, Mar 1 2015, 13:52:09)
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[GCC 4.9.2] on linux2
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Type "help", "copyright", "credits" or "license" for more information.
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>>>
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The ``>>>`` characters are the default prompt for Python. In the examples
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below, we have removed these characters so it's easier to cut and
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paste the code into your session.
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Load the ev3dev-lang_ bindings:
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.. code-block:: python
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import ev3dev.ev3 as ev3
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Now let's try our first program. This code will turn the left LED red
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whenever the touch sensor is pressed, and back to green when it's
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released. Plug a touch sensor into any sensor port and then paste in this
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code - you'll need to hit ``Enter`` after pasting to complete the
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loop and start the program. Hit ``Ctrl-C`` to exit the loop.
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.. code-block:: python
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ts = ev3.TouchSensor()
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while True:
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ev3.Leds.set_color(ev3.Leds.LEFT, (ev3.Leds.GREEN, ev3.Leds.RED)[ts.value()])
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Now plug a motor into the ``A`` port and paste this code into the terminal. This
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little program will run the motor at 75% power for 3 seconds.
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.. code-block:: python
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m = ev3.LargeMotor('outA')
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m.run_timed(time_sp=3000, duty_cycle_sp=75)
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If you want to make your robot speak, then paste this code into the terminal:
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.. code-block:: python
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ev3.Sound.speak('Welcome to the EV3DEV project!').wait()
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To quit Python, just type ``exit()`` or ``Ctrl-D``.
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User Resources
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--------------
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Getting Started with ev3dev
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If you got here as the result of looking for "how to program
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LEGO MINDSTORMS EV3 using Python" then you might not be aware that
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this is part of a much larger project called ev3dev_. Make sure
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you read the `Getting Started`_ page
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to become familiar with ev3dev_ first!
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Connecting the EV3 to the Internet
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You can connect to an EV3 running ev3dev_ using USB, Wifi or
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Bluetooth. The USB connection is a good starting point, and
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the ev3dev_ site has `detailed instructions for USB connections`_
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for Linux, Windows, and Mac computers.
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Demo Robot
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Laurens Valk of robot-square_ has been kind enough to allow us to
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reference his excellent `EXPLOR3R`_ robot. Consider building the
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`EXPLOR3R`_ and running the demo programs referenced below to get
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familiar with what Python programs using this binding look like.
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Demo Code
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There are `demo programs`_ that you can run to get acquainted with
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this language binding. The programs are designed to work with the
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`EXPLOR3R`_ robot.
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Developer Resources
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-------------------
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Python Package Index
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The Python language has a `package repository`_ where you can find
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libraries that others have written, including the `latest version of
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this package`_.
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The ev3dev Binding Specification
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Like all of the language bindings for ev3dev_ supported hardware, the
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Python binding follows the minimal API that must be provided per
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`this document`_.
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The ev3dev-lang Project on GitHub
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The `source repository for the generic API`_ and the scripts to automatically
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generate the binding. Only developers of the ev3dev-lang-python_ binding
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would normally need to access this information.
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Python2.x and Python3.x Compatibility
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-------------------------------------
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The ev3dev_ distribution comes with both python2_ and python3_ installed and
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this library is compatible with both versions.
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Note that currently, the source is only installed in the default
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`Python 2.x`_ location - this will be addressed in the next package we
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release.
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For `Python 2.x`_ programs, you import the binding like this:
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.. code-block:: python
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from ev3dev.auto import *
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For `Python 3.x`_ the easiest way to work around the problem is
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to get your EV3 connected to the Internet and then:
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#. Update the package lists
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#. Install the ``python3-pil`` package
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#. Use ``easy-install`` install ``python-ev3dev``
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.. code-block:: bash
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sudo apt-get update
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sudo apt-get install python3-pil
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sudo python3 -m easy_install python-ev3dev
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You will be asked for the ``robot`` user's password to get ``sudo`` access
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to the system - the default password is ``maker``.
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Please be patient - a typical ``apt-get update`` will take about
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10 minutes - there's a LOT going on under the hood to sort out
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package dependencies.
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And now you can use ev3dev-lang-python_ under `Python 3.x`_.
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.. code-block:: python
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from ev3dev.auto import *
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----
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.. _ev3dev: http://ev3dev.org
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.. _Getting Started: ev3dev-getting-started_
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.. _ev3dev-getting-started: http://www.ev3dev.org/docs/getting-started/
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.. _detailed instructions for USB connections: ev3dev-usb-internet_
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.. _ev3dev-usb-internet: http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/
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.. _source repository for the generic API: ev3dev-lang_
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.. _ev3dev-lang: https://github.com/ev3dev/ev3dev-lang
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.. _ev3dev-lang-python: https://github.com/rhempel/ev3dev-lang-python
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.. _this document: wrapper-specification_
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.. _wrapper-specification: https://github.com/ev3dev/ev3dev-lang/blob/develop/wrapper-specification.md
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.. _EXPLOR3R: demo-robot_
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.. _demo-robot: http://robotsquare.com/2015/10/06/explor3r-building-instructions/
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.. _demo programs: demo-code_
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.. _demo-code: https://github.com/rhempel/ev3dev-lang-python/tree/master/demo
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.. _robot-square: http://robotsquare.com/
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.. _Python 2.x: python2_
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.. _python2: https://docs.python.org/2/
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.. _Python 3.x: python3_
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.. _python3: https://docs.python.org/3/
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.. _package repository: pypi_
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.. _pypi: https://pypi.python.org/pypi
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.. _latest version of this package: pypi-python-ev3dev_
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.. _pypi-python-ev3dev: https://pypi.python.org/pypi/python-ev3dev

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