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106 lines
4.4 KiB
106 lines
4.4 KiB
10 years ago
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Running your first script
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=========================
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Let's jump right in and get a Python script running on the pyboard. After
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all, that's what it's all about!
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Connecting your pyboard
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-----------------------
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Connect your pyboard to your PC (Windows, Mac or Linux) with a micro USB cable.
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There is only one way that the cable will connect, so you can't get it wrong.
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<img src="/static/doc/pyboard-usb-micro.jpg" alt="pyboard with USB micro cable" style="width:200px; border:1px solid black; display:inline-block;"/>
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When the pyboard is connected to your PC it will power on and enter the start up
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process (the boot process). The green LED should light up for half a second or
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less, and when it turns off it means the boot process has completed.
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Opening the pyboard USB drive
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-----------------------------
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Your PC should now recognise the pyboard. It depends on the type of PC you
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have as to what happens next:
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- **Windows**: Your pyboard will appear as a removable USB flash drive.
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Windows may automatically pop-up a window, or you may need to go there
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using Explorer.
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Windows will also see that the pyboard has a serial device, and it will
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try to automatically configure this device. If it does, cancel the process.
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We will get the serial device working in the next tutorial.
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- **Mac**: Your pyboard will appear on the desktop as a removable disc.
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It will probably be called "NONAME". Click on it to open the pyboard folder.
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- **Linux**: Your pyboard will appear as a removable medium. On Ubuntu
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it will mount automatically and pop-up a window with the pyboard folder.
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On other Linux distributions, the pyboard may be mounted automatically,
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or you may need to do it manually. At a terminal command line, type ``lsblk``
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to see a list of connected drives, and then ``mount /dev/sdb1`` (replace ``sdb1``
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with the appropriate device). You may need to be root to do this.
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Okay, so you should now have the pyboard connected as a USB flash drive, and
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a window (or command line) should be showing the files on the pyboard drive.
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The drive you are looking at is known as ``/flash`` by the pyboard, and should contain
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the following 4 files:
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- [``boot.py``](/static/doc/fresh-pyboard/boot.py) -- this script is executed when the pyboard boots up. It sets
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up various configuration options for the pyboard.
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- [``main.py``](/static/doc/fresh-pyboard/main.py) -- this is the main script that will contain your Python program.
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It is executed after ``boot.py``.
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- [``README.txt``](/static/doc/fresh-pyboard/README.txt) -- this contains some very basic information about getting
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started with the pyboard.
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- [``pybcdc.inf``](/static/doc/fresh-pyboard/pybcdc.inf) -- this is a Windows driver file to configure the serial USB
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device. More about this in the next tutorial.
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Editing ``main.py``
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-------------------
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Now we are going to write our Python program, so open the ``main.py``
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file in a text editor. On Windows you can use notepad, or any other editor.
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On Mac and Linux, use your favourite text editor. With the file open you will
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see it contains 1 line::
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# main.py -- put your code here!
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This line starts with a # character, which means that it is a *comment*. Such
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lines will not do anything, and are there for you to write notes about your
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program.
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Let's add 2 lines to this ``main.py`` file, to make it look like this::
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# main.py -- put your code here!
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import pyb
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pyb.LED(4).on()
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The first line we wrote says that we want to use the ``pyb`` module.
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This module contains all the functions and classes to control the features
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of the pyboard.
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The second line that we wrote turns the blue LED on: it first gets the ``LED``
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class from the ``pyb`` module, creates LED number 4 (the blue LED), and then
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turns it on.
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Resetting the pyboard
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---------------------
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To run this little script, you need to first save and close the ``main.py`` file,
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and then eject (or unmount) the pyboard USB drive. Do this like you would a
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normal USB flash drive.
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When the drive is safely ejected/unmounted you can get to the fun part:
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press the RST switch on the pyboard to reset and run your script. The RST
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switch is the small black button just below the USB connector on the board,
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on the right edge.
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When you press RST the green LED will flash quickly, and then the blue
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LED should turn on and stay on.
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Congratulations! You have written and run your very first Micro Python
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program!
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