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125 lines
4.5 KiB
ReStructuredText
125 lines
4.5 KiB
ReStructuredText
Creating and running programs
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=============================
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Now that you've set up your computer and your EV3 brick, you're ready to start writing programs.
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To make it easier to create and manage your programs, let's first have a quick look at how MicroPython projects and programs for your EV3 robots are organized.
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Programs are organized into *project folders*, as shown below. A project folder is a directory on your computer that contains the main program (**main.py**), and other optional scripts or files. This project folder and all of its contents will be copied to the EV3, where the main program will be run.
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This page shows you how to create such a project and how to transfer it to the EV3.
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.. figure:: images/projectstructure.png
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:width: 100 %
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:alt: alt
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:align: center
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A project contains a program called **main.py** and optional resources like sounds or MicroPython modules.
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Creating a new project
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-----------------------------------------------------------
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To create a new project, open the Pybricks tab and click *create a new project*, as shown below. Enter a project name in the text field that appears and press *Enter*. When prompted, choose a location for this program and confirm by clicking *choose folder*.
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.. figure:: images/newproject.png
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:width: 100 %
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:alt: alt
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:align: center
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Creating a new project. This example is called *getting_started*, but you can choose any name.
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When you create a new project, it already includes a file called *main.py*. To see its contents and to modify it, open it from the file browser as shown below. This is where you'll write your programs.
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If you are new to MicroPython programming, we recommend that you keep the existing code in place and add your code to it.
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.. figure:: images/projectoverview.png
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:width: 100 %
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:alt: alt
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:align: center
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Opening the default *main.py* program.
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Connecting to the EV3 brick with Visual Studio Code
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-----------------------------------------------------------
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To be able to transfer your code to the EV3 brick, you'll first need to connect the EV3 brick to your computer with the mini-USB cable and configure this connection with Visual Studio Code. To do so:
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- Turn the EV3 brick on
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- Connect the EV3 brick to your computer with the mini-USB cable
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- Configure the USB connection as shown:
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.. figure:: images/connecting.png
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:width: 100 %
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:alt: alt
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:align: center
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Configuring the USB connection between the computer and the EV3 brick
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Downloading and running a program
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-----------------------------------------------------------
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You can press the F5 key to run the program. Alternatively, you can start it manually by going to the *debug* tab, and clicking the green start arrow, as shown below.
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When the program starts, a pop up toolbar allows you to stop the program if necessary. You can also stop the program at any time using the back button on the EV3 brick.
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If your program produces any output with the :mod:`print <.tools>` command, this is shown in the output window.
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.. figure:: images/running.png
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:width: 100 %
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:alt: alt
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:align: center
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Running a program
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Expanding the example program
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Now that you've run the basic code template, you can expand the program to make a motor move. First, attach a Large Motor to Port B on the EV3 brick, as shown below.
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.. figure:: images/firstprogram.png
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:width: 100 %
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:alt: alt
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:align: center
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The EV3 brick with a Large Motor attached to port B.
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Next, edit *main.py* to make it look like this:
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.. literalinclude:: ../../examples/ev3/getting_started/main.py
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This program makes your robot beep, rotate the motor, and beep again with a higher pitched tone. Run the program to make sure that it works as expected.
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.. _managefiles:
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Managing files on the EV3
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After you've downloaded a project to the EV3, you can run, delete, or back up programs stored on the EV3 using the device browser:
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.. figure:: images/files.png
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:width: 100 %
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:alt: alt
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:align: center
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Using the EV3 device browser to manage files on your EV3
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Running a program without a computer
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-----------------------------------------------------------
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You can run previously downloaded programs directly from the brick.
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To do so, find the program using the *file browser* on the EV3 screen and use the center button key to start the program.
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.. figure:: images/manualrun.png
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:width: 100 %
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:alt: alt
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:align: center
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Starting a program using the buttons on the EV3 brick
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