Language - Python: Difference between revisions

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We provide support for Python in all major operating systems. We also provide instructions on how to get your project started in a number of common development environments. Select your operating system and preferred development environment below, and follow the instructions to get your project running with Phidgets.


== Quick Downloads ==
If you do not know which development environment you want to use, or your development environment of choice is not listed, we recommend starting with command line or terminal as the simplest path to getting your code running.


=== Documentation ===
Once you have set up your development environment to run with Phidgets, we recommend you follow our guide on [[Phidget Programming Basics]]. The guide will showcase the fundamentals of programming with Phidgets, with examples in Python.


*{{Phidget22API}} (Select Python from drop-down menu)
== Setup Guide ==


=== Example Code ===
<div class="phd-deck-sequence">
{{PT3_PYTHON_CHOOSE}}{{PT3_PYTHON_WIN_PYCHARM}}{{PT3_PYTHON_WIN_PYCHARM_1}}{{PT3_PYTHON_WIN_PYCHARM_2}}{{PT3_PYTHON_WIN_PYCHARM_3}}{{PT3_PYTHON_WIN_CMD}}{{PT3_PYTHON_MAC_TRM}}{{PT3_PYTHON_LNX_TRM}}{{PT3_PYTHON_SBC_TRM}}{{PT3_PYTHON_WIN_LIC}}{{PT3_PYTHON_WIN_VS}}{{PT3_PYTHON_WIN_VS_1}}{{PT3_PYTHON_WIN_VS_2}}{{PT3_PYTHON_WIN_IDLE}}
</div>


*{{SampleCode|Python|Python Examples}}


=== Libraries ===
== Quick Downloads ==
{{AllQuickDownloads}}
*[{{SERVER}}/downloads/phidget22/libraries/any/Phidget22Python.zip Phidget Python module]


== Getting Started with Python ==
If you already know what you're doing and just need the files, you can find them all below.
Welcome to using Phidgets with Python! By using Python, you will have access to the complete {{Phidget22API}}, including events. We also provide example code in Python for all Phidget devices.


Phidget22 supports Python versions 2.7 and 3.2+.
=== Python Package ===


If you are developing for Windows, keep reading. Otherwise, select your operating system to jump ahead:
It is recommended to follow the instructions in the setup guide above and use PIP to install the python package, but if you need the source file, you can download it here.
*[[#macOS | macOS]]
*[[#Linux | Linux]]


== Windows ==
* [https://cdn.phidgets.com/downloads/phidget22/libraries/any/Phidget22Python.zip Phidget Python Package]
{{Windows_Languages}}


===Install Phidget Python module for Windows===
=== Documentation ===
Before getting started with the guides below, ensure you have [https://www.python.org/downloads/ Python] installed on your machine (both 2.7 and 3.6 are compatible with Phidgets). You will also need to download the [{{SERVER}}/downloads/phidget22/libraries/any/Phidget22Python.zip Phidget Python module].


After unpacking the Phidget Python module, open the command prompt at folder location and enter the following command:
*{{Phidget22API}}  (select Python from the drop-down menu)
<syntaxhighlight lang=python>
python setup.py install
</syntaxhighlight>


This will build the module and install the Python module files into your site-packages directory.
=== Example Code ===
 
[[File:Python_install.png|link=|center]]
 
===Command line===
====Use our examples====
One of the best ways to start programming with Phidgets is to use our example code as a guide. Before we get started, make sure you have read [[#Install Phidget Python module for Windows | how to install the Phidget Python module]] section above.
 
 
Now that you have Python and the Phidget Python module installed, select an example that will work with your Phidget:
*{{SampleCode|Python|Python Examples}}
 
 
Open the command prompt at the location of the example and enter the following command:
<syntaxhighlight lang=bash>
python example.py
</syntaxhighlight>
 
 
[[Image:Python_command_run.png|link=|center]]
 
 
You should now have the example up and running for your device. Play around with the device and experiment with some of the functionality. When you are ready, the next step is configuring your project and writing your own code!
 
====Configure your project====
When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Java library.
 
 
To include the Phidget Python library, add the following line to your code:
 
<syntaxhighlight lang=python>
from Phidget22.PhidgetException import *
from Phidget22.Phidget import *
</syntaxhighlight>
 
Then, you will also have to add a reference to your particular Phidget. For example, you would include the following line for a DigitalInput:
 
<syntaxhighlight lang=python>
from Phidget22.Devices.DigitalInput import *
</syntaxhighlight>
 
You can now compile the file as shown in the previous section.
 
 
The project now has access to Phidgets. Next, view the [[#Write Code | write your own code]] section located below.
 
===IDLE===
====Use our examples====
One of the best ways to start programming with Phidgets is to use our example code as a guide. Before we get started, make sure you have read [[#Install Phidget Python module for Windows| how to install the Phidget Python module]] section above.
 
 
Now that you have Python and the Phidget Python module installed, select an example that will work with your Phidget:
*{{SampleCode|Python|Python Examples}}
 
 
Right-click on the example and open it in IDLE:
[[Image:Python_idle_open.png|link=|center]]
 
 
To run the example, simply click on ''Run'' and select ''Run Module'':
[[Image:Python_idle_run.png|link=|center]]
 
 
 
You should now have the example up and running for your device. Play around with the device and experiment with some of the functionality. When you are ready, the next step is configuring your project and writing your own code!
 
====Configure your project====
When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Java library.
 
 
To include the Phidget Python library, add the following line to your code:
 
<syntaxhighlight lang=python>
from Phidget22.PhidgetException import *
from Phidget22.Phidget import *
</syntaxhighlight>
 
Then, you will also have to add a reference to your particular Phidget. For example, you would include the following line for a DigitalInput:
 
<syntaxhighlight lang=python>
from Phidget22.Devices.DigitalInput import *
</syntaxhighlight>
 
You can now compile the file as shown in the previous section.


The project now has access to Phidgets. Next, view the [[#Write Code | write your own code]] section located below.
===Visual Studio===
====Use our examples====
One of the best ways to start programming with Phidgets is to use our example code as a guide. Before we get started, make sure you have read [[#Install Phidget Python module for Windows| how to install the Phidget Python module]] section above. You will also need to download [https://www.visualstudio.com/ Microsoft Visual Studio] if you have not already.
Now that you have Python and the Phidget Python module installed, as well as Visual Studio, select an example that will work with your Phidget:
*{{SampleCode|Python|Python Examples}}
*{{SampleCode|Python|Python Examples}}
Next, create a new Python project:
[[Image:Python_vs_newproject.PNG|link=|center]]
Delete the Python file that was generated with the project:
[[Image:Python_vs_delete.png|link=|center]]
Add the example you just downloaded by right-clicking on the project and adding an existing item:
[[Image:Python_vs_addexisting.png|link=|center]]
Select the example as the startup file:
[[Image:Python_vs_startupproject.png|link=|center]]
Ensure that your Python environment is the same as the version you have installed. Enter the following command to view your Python version if you are unsure:
<syntaxhighlight lang=python>
python -V
</syntaxhighlight>
[[Image:Python_version.PNG|link=|center]]
You can view/edit your Python environment under the ''Python Environments'' tab:
[[Image:Python_vs_environment.png|link=|center]]
You should now have the example up and running for your device. Play around with the device and experiment with some of the functionality. When you are ready, the next step is configuring your project and writing your own code!
====Configure your project====
When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Java library.
To include the Phidget Python library, add the following line to your code:
<syntaxhighlight lang=python>
from Phidget22.PhidgetException import *
from Phidget22.Phidget import *
</syntaxhighlight>
Then, you will also have to add a reference to your particular Phidget. For example, you would include the following line for a DigitalInput:
<syntaxhighlight lang=python>
from Phidget22.Devices.DigitalInput import *
</syntaxhighlight>
You can now create your project as shown in the previous section.
The project now has access to Phidgets. Next, view the [[#Write Code | write your own code]] section located below.
===LiClipse===
====Use our examples====
One of the best ways to start programming with Phidgets is to use our example code as a guide. Before we get started, make sure you have read [[#Install Phidget Python module for Windows | how to install the Phidget Python module]] section above. You will also need to download [http://www.liclipse.com/ LiClipse] if you have not already.
Now that you have Python and the Phidget Python module installed, as well as LiClipse, select an example that will work with your Phidget:
*{{SampleCode|Python|Python Examples}}
Next, create a new Python project:
[[Image:Python_liclipse_newproject.PNG|link=|center]]
Add the example you just downloaded by dragging it into the project:
[[Image:Python_liclipse_import.png|link=|center]]
Finally, run the project:
[[Image:Python_liclipse_run.png|link=|center]]
You should now have the example up and running for your device. Play around with the device and experiment with some of the functionality. When you are ready, the next step is configuring your project and writing your own code!
====Configure your project====
When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Java library.
To include the Phidget Python library, add the following line to your code:
<syntaxhighlight lang=python>
from Phidget22.PhidgetException import *
from Phidget22.Phidget import *
</syntaxhighlight>
Then, you will also have to add a reference to your particular Phidget. For example, you would include the following line for a DigitalInput:
<syntaxhighlight lang=python>
from Phidget22.Devices.DigitalInput import *
</syntaxhighlight>
You can now create your project as shown in the previous section.
The project now has access to Phidgets. Next, view the [[#Write Code | write your own code]] section located below.
==macOS==
{{macOS_Languages}}
===Install Phidget Python module for macOS===
Before getting started with the guides below, ensure you have [https://www.python.org/downloads/ Python] installed on your machine (both 2.7 and 3.6 are compatible with Phidgets). You will also need to download the [{{SERVER}}/downloads/phidget22/libraries/any/Phidget22Python.zip Phidget Python module].
After unpacking the Phidget Python module, open the terminal at folder location and enter the following command:
<syntaxhighlight lang=python>
python setup.py install
</syntaxhighlight>
This will build the module and install the Python module files into your site-packages directory.
[[File:Python_mac_install.png|link=|center]]
===Terminal===
====Use our examples====
One of the best ways to start programming with Phidgets is to use our example code as a guide. Before we get started, make sure you have read [[#Install Phidget Python module for macOS| how to install the Phidget Python module]] section above.
Now that you have Python and the Phidget Python module installed, select an example that will work with your Phidget:
*{{SampleCode|Python|Python Examples}}
Open the terminal at the location of the example and enter the following command:
<syntaxhighlight lang=bash>
python example.py
</syntaxhighlight>
[[Image:Python_mac_terminal_run.png|link=|center]]
You should now have the example up and running for your device. Play around with the device and experiment with some of the functionality. When you are ready, the next step is configuring your project and writing your own code!
====Configure your project====
When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Java library.
To include the Phidget Python library, add the following line to your code:
<syntaxhighlight lang=python>
from Phidget22.PhidgetException import *
from Phidget22.Phidget import *
</syntaxhighlight>
Then, you will also have to add a reference to your particular Phidget. For example, you would include the following line for a DigitalInput:
<syntaxhighlight lang=python>
from Phidget22.Devices.DigitalInput import *
</syntaxhighlight>
You can now compile the file as shown in the previous section.
The project now has access to Phidgets. Next, view the [[#Write Code | write your own code]] section located below.
== Linux ==
{{Linux_Languages}}
===Install Phidget Python module for Linux===
Before getting started with the guides below, ensure you have [https://www.python.org/downloads/ Python] installed on your machine (both 2.7 and 3.6 are compatible with Phidgets). 
You will also need to download the [{{SERVER}}/downloads/phidget22/libraries/any/Phidget22Python.zip Phidget Python module].
After unpacking the Phidget Python module, open the terminal at folder location and enter the following command:
<syntaxhighlight lang=python>
python setup.py install
</syntaxhighlight>
This will build the module and install the Python module files into your site-packages directory.
[[File:Python_linux_install.PNG|link=|center]]
===Terminal===
====Use our examples====
One of the best ways to start programming with Phidgets is to use our example code as a guide. Before we get started, make sure you have read [[#Install Phidget Python module for Linux| how to install the Phidget Python module]] section above.
Now that you have Python and the Phidget Python module installed, select an example that will work with your Phidget:
*{{SampleCode|Python|Python Examples}}
Open the terminal at the location of the example and enter the following command:
<syntaxhighlight lang=bash>
python example.py
</syntaxhighlight>
[[Image:Python_linux_terminal_run.png|link=|center]]
You should now have the example up and running for your device. Play around with the device and experiment with some of the functionality. When you are ready, the next step is configuring your project and writing your own code!
====Configure your project====
When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Java library.
To include the Phidget Python library, add the following line to your code:
<syntaxhighlight lang=python>
from Phidget22.PhidgetException import *
from Phidget22.Phidget import *
</syntaxhighlight>
Then, you will also have to add a reference to your particular Phidget. For example, you would include the following line for a DigitalInput:
<syntaxhighlight lang=python>
from Phidget22.Devices.DigitalInput import *
</syntaxhighlight>
You can now create your project as shown in the previous section.
The project now has access to Phidgets. Next, view the [[#Write Code | write your own code]] section located below.
==Write Code==
{{WriteCode_Intro}}
=== Step One: Initialize and Open ===
You will need to declare your Phidget object in your code. For example, we can declare a digital input object like this:
<syntaxhighlight lang=python>
ch = DigitalInput()
</syntaxhighlight>
Next, we can open the Phidget object like this:
<syntaxhighlight lang=python>
ch.open()
</syntaxhighlight>
Although we are not including it on this page, you should handle the return values of all Phidget functions. Here is an example of the previous code with error handling:
<syntaxhighlight lang=python>
try:
  ch = DigitalInput()
except RuntimeError as e:
  print("Runtime Error: %s" % e.message)
try:
  ch.open()
except PhidgetException as e:
  print (“Phidget Exception %i: %s” % (e.code, e.details))
</syntaxhighlight>
=== Step Two: Wait for Attachment (plugging in) of the Phidget ===
Simply calling open does not guarantee you can use the Phidget immediately. To use a Phidget, it must be plugged in (attached). We can handle this by using event driven programming and tracking the attach events. Alternatively, we can modify our code so we wait for an attachment:
<syntaxhighlight lang=python>
ch = DigitalInput()
ch.openWaitForAttachment(5000)
</syntaxhighlight>
Waiting for attachment will block indefinitely until a connection is made, or until the timeout value is exceeded
To use events to handle attachments, we have to modify our code slightly:
<syntaxhighlight lang=python>
ch = DigitalInput()
ch.setOnAttachHandler(onAttachHandler)
ch.open()
</syntaxhighlight>
Next, we have to declare the function that will be called when an attach event is fired - in this case the function ''OnAttachedHandler'' will be called:
<syntaxhighlight lang=python>
def onAttachHandler(e):
    print("Phidget attached!")
</syntaxhighlight>
=== Step Three: Do Things with the Phidget ===
We recommend the use of event driven programming when working with Phidgets. In a similar way to handling an attach event as described above, we can also add an event handler for a state change event:
<syntaxhighlight lang=python>
ch = DigitalInput()
ch.setOnAttachHandler(onAttachHandler)
ch.setOnStateChangeHandler(onStateChangeHandler)
ch.open()
</syntaxhighlight>
This code will connect a function and an event. In this case, the ''onStateChangeHandler'' function will be called when there has been a change to the devices input. Next, we need to create the ''onStateChangeHandler'' function:
<syntaxhighlight lang=python>
def onStateChangeHandler(e, state):
    print("State %f" % state)
    return 0
</syntaxhighlight>
If events do not suit your needs, you can also poll the device directly for data using code like this:
<syntaxhighlight lang=python>
state = ch.getState()
print("State %f" % state)
</syntaxhighlight>
=== Step Four: Close and Delete ===
At the end of your program, be sure to close and delete your device:
<syntaxhighlight lang=python>
ch.close()
</syntaxhighlight>
== Further Reading ==
[[Phidget Programming Basics]] - Here you can find the basic concepts to help you get started with making your own programs that use Phidgets.
[[Data Interval/Change Trigger]] - Learn about these two properties that control how much data comes in from your sensors.
[[Using Multiple Phidgets]] - It can be difficult to figure out how to use more than one Phidget in your program. This page will guide you through the steps.
[[Polling vs. Events]] - Your program can gather data in either a polling-driven or event-driven manner. Learn the difference to determine which is best for your application.
[[Logging, Exceptions, and Errors]] - Learn about all the tools you can use to debug your program.
[[Phidget Network Server]] - Phidgets can be controlled and communicated with over your network- either wirelessly or over ethernet.

Latest revision as of 22:55, 19 December 2024


We provide support for Python in all major operating systems. We also provide instructions on how to get your project started in a number of common development environments. Select your operating system and preferred development environment below, and follow the instructions to get your project running with Phidgets.

If you do not know which development environment you want to use, or your development environment of choice is not listed, we recommend starting with command line or terminal as the simplest path to getting your code running.

Once you have set up your development environment to run with Phidgets, we recommend you follow our guide on Phidget Programming Basics. The guide will showcase the fundamentals of programming with Phidgets, with examples in Python.

Setup Guide

Python - Select Development Environment

Select your Development Environment:

Windows

MacOS

Linux

PhidgetSBC

Language - Python

Windows with Pycharm

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

PyCharm is an integrated development environment for Python by JetBrains.

Installing the Phidget Python Module

First, install Python3 if you haven't already.

Next, select your preferred installation method below:

PIP Install

PIP Global Install

«
»

Language - Python

Installing the Phidget Python Module

You can install the Phidget22 libraries for your current PyCharm project with PIP by opening File > Settings

Installing the Phidget Python Module

Next, navigate to Project > Project Interpreter and click on the + symbol located on the right:

Installing the Phidget Python Module

Type Phidget22 into the search bar, select the package named Phidget22 and click Install Package:

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

Click the Download Example button to download the sample code:

Using the Code Samples

Add the example you just downloaded by dragging it into the project:

Using the Code Samples

Finally, run the project:

The project is now running with Phidgets!

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

«
»

Language - Python

Installing the Phidget Python Module

Python 3.4+ includes PIP by default. To install the Phidget22 Python module with PIP, simply open the Command Prompt (press the Windows key and search for cmd), and enter the command:

python -m pip install Phidget22

Installing the Phidget Python Module

To use the global Phidget22 library in your PyCharm project, select Inherit global site-packages when creating a new project.

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

Click the Download Example button to download the sample code:

Using the Code Samples

Add the example you just downloaded by dragging it into the project:

Using the Code Samples

Finally, run the project:

The project is now running with Phidgets!

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

«
»

Language - Python

Installing the Phidget Python Module

To install the Phidget22 Python module without PIP, you need to download it here:

● Phidget22 Python Module

Unpack the Phidget22 Python module and open the Command Prompt (press the Windows key and search for cmd). Find the folder where you downloaded the Python module and enter this command:

python setup.py install

This will build the module and install the Python module files into your site-packages directory.

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

Click the Download Example button to download the sample code:

Using the Code Samples

Add the example you just downloaded by dragging it into the project:

Using the Code Samples

Finally, run the project:

The project is now running with Phidgets!

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

«
»

Language - Python

Windows with Command Line

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

The command line is the default environment to make Python programs in Windows, since it's available immediately after installing Python.

Installing the Phidget Python Module

First, install Python3 if you haven't already.

Python 3.4+ includes PIP by default. To install the Phidget22 Python module with PIP, simply open the Command Prompt (press the Windows key and search for cmd), and enter the command:

python -m pip install Phidget22

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

Click the Download Example button to download the sample code:

Using the Code Samples

To run the example, open the command prompt at the location of the example and enter the following command:

python example.py

The script is now running with Phidgets!

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

«
»

Language - Python

MacOS with Terminal

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

The terminal is the default environment to make Python programs in macOS, since it's available immediately after installing Python.

Requirements

First, install Python3 if you haven't already.

If you plan on using any USB Phidgets that use the HID stack, you'll need to install the Phidget drivers for MacOS. You can check which stack your USB Phidgets use by checking the 'USB Stack' in the product specifications. If all of your Phidgets use the PHIDUSB stack, you can skip installing the drivers.

Installing the Phidget Python Module

To install the Phidgets Python Module, you'll need PIP, which is included in Python 3.4+ by default. To install the Phidget22 Python module with PIP, simply open the Terminal and enter the command:

python pip install Phidget22

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

Click the Download Example button to download a Java file with the sample code:

Using the Code Samples

To run the example, open the command prompt at the location of the example and enter the following command:

python example.py

Success! Your program is now running with Phidgets!

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

«
»

Language - Python

Linux with Terminal

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

The terminal is the default environment to make Python programs in Linux, since it's available immediately after installing Python.

Installing the Phidget Python Module

First, install Python3 if you haven't already.

Python 3.4+ includes PIP by default. To install the Phidget22 Python module with PIP, simply open the Terminal and enter the command:

pip3 install Phidget22

Setting UDev Rules

By default, Linux will not allow regular users to access physical hardware, as a security feature. This means that you must grant yourself root privileges via sudo to run Phidgets code.

sudo python3 Python_Example.py

To avoid having to use sudo every time, you can set up a rules file to allow it automatically using the vendor code for Phidget USB devices. Create a text file called 99-libphidget22.rules containing the following line:

SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="06c2", ATTRS{idProduct}=="00[3-a][0-f]", MODE="666"

Mode 666 means every user has permission to read and write to the specified devices. Next, move this file to /etc/udev/rules.d. Now you can run code that uses Phidgets as a regular user without sudo.

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

Click the Download Example button to download a Java file with the sample code:

Using the Code Samples

To run the example, open the command prompt at the location of the example and enter the following command:

python3 Python_Example.py

Success! Your program is now running with Phidgets!

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

«
»

Language - Python

PhidgetSBC with Python

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

Requirements

If you haven't already, check out the user guide in order to set up the following:

● Connection to local Network

● Administrator password


This guide will cover development using an external machine. For development using the SBC itself, go back and select Terminal - Linux as your environment.

Installing Python

The quickest way to install Python is through the SBC web interface. Open the Phidget Control Panel on your external machine and click on the Network Phidgets tab.

Double click on your SBC in the device list.

Installing Python

Once you're logged in to the web interface, click on System and Packages.

It may take a minute or two to load this page.

Installing Python

Finally, click on the Install button next to Python Support.

It will take a few minutes to install. Once it's complete you can click on the Back button.

Developing With An External Computer

There are two main ways in which you can access your SBC from an external computer:

● SBC Web Interface

● Secure Shell (SSH)


Since the SBC OS Guide covers the web interface in detail, this guide will cover SSH.

SSH

If you are unfamiliar with SSH, it is a simple yet powerful tool that allows you to log into a remote machine in order to execute commands. You can also transfer files using the associated SCP tool.

In order to use SSH, you need the following:

● The SBC's IP address (e.g. 192.168.3.195) or the link local address (e.g. phidgetsbc.local)

● The administrator password

● SSH enabled on the SBC

SSH

You can enable SSH on the SBC Web Interface as shown below:

SSH on Windows

To use SSH on Windows, we recommend PuTTY. Use the images below as a guide for configuring PuTTY (use the IP address or the link local address interchangeably):

SSH on Windows

After clicking open, simply login as root and provide the administrator password:

To transfer files between your SBC and Windows machine, we recommend either of these programs:

● WinSCP

● PuTTY PSCP

You will follow a similar process to access the SBC as described for SSH.

SSH on Linux and macOS

SSH is available on Linux and macOS by default. To run SSH, open the terminal and type:

ssh root@phidgetsbc.local

Or, something like this (you will need to know the IP address of your SBC):

ssh root@192.168.3.195

You will then be prompted for the password in order to gain access to the SBC:

SSH on Linux and macOS

To copy a file from the SBC to your development machine using SCP, open the terminal and type:

scp root@phidgetsbc.local:/path/to/source /path/to/destination

You can reverse this if you want to transfer a file from your development machine to your SBC:

scp /path/to/source root@phidgetsbc.local:/path/to/destination

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

If it's unclear what any of the options do, click on the nearby '?' for more info.

Once you've made your selections, click the Download Example button under Downloads.

Setting up a New Project

When developing on an external computer, you should write and test your programs on that machine. When you are ready, upload your program to the SBC.

Setting up a New Project

Once your code is written, follow these steps to get your program running on the SBC:

1. Using the SBC Web Interface, create a new project:

Setting up a New Project

2. Transfer all the project files from the development machine to the SBC, either using the SBC Web Interface or a tool like WinSCP.

The project directory will be:

/usr/userapps/ProjectName

Setting up a New Project

3. Use SSH to access the SBC terminal and go to the project folder:

cd /usr/userapps/ProjectName

You can now run the program with the command:

python ExampleName.py

Success! The program is running on your SBC.

Running a Program Automatically

To run a Python script as a standalone application or to run it in the web interface, you will need to add a line to the top of the script with the path to your Python executable. If you have followed the steps in this guide, it will be:

#!/usr/bin/python

Click on the sections below for various automation options:

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Running a Program from the SBC Web Interface

To quickly test whether a program can be run automatically, you can try starting it from the SBC Web Interface.

1. To start the program, navigate to Projects->ProjectName->Startup Settings in the SBC Web Interface.

2. Select your program in the drop-down menu labeled Executable/Class Name.



3. Click the Start button on the SBC web interface.


4. You'll note that as it runs, there are two links below the Stop button which can be used to view the program output:

  • stdout: view the program output like you would in a terminal or command prompt
  • stderr: view the program error output
Run on Boot

Running on boot ensures that your program will never miss an event. As long as the SBC is running, your code will be running. This section assumes you have written and compiled your program on an external computer, and have uploaded it to the SBC Web Interface.


To have your program run on boot, navigate to Projects->ProjectName->Startup Settings in the SBC Web Interface. After selecting your project, copy the settings from the image below:



We will review some of the options that are shown in the image above:

  • Startup Order: lower numbers boot first. Booting later means more programs are available for use, booting earlier means other programs can use your program.
  • Run as a daemon: starts the program as a daemon. Unless you have explicitly written your program as a daemon, leave this checked, or else your SBC may hang on boot.
  • Executable/Class name: your main Java class or C file.
  • Arguments: any command line arguments the program needs.

After saving your changes, your program will run automatically whenever your SBC boots.

Run on a Schedule

Running your program on a schedule allows you to perform your task once a week, or once a minute without worrying about memory management issues or instability problems that may arise. It executes, and then gets cleaned up. To run your program on a schedule, we recommend using Cron. Cron can automatically schedule programs (known as jobs, or cron jobs). Cron simply reads a crontab file and runs whatever programs are listed, with whatever timing they are listed with. Cron runs continuously in the background, but the cron jobs only run as long as they naturally would, and then they exit.


Let's set up your first cron job. We will use nano to edit the crontab file, but feel free to use whatever editor you prefer.


First, set your editor to nano: 

export EDITOR=nano

Next, edit your crontab file: 

crontab -e

Finally, schedule your cron job: 

#cron job that will run at 5AM every week:
0 5 * * 1 /root/code/myprogram argument1


After entering your task, simply save and exit the file.

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

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Language - Python

Windows with LiClipse

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

LiClipse is a closed-source development environment based on Eclipse, with support for Python.

Installing the Phidget Python Module

First, install Python3 if you haven't already.

Python 3.4+ includes PIP by default. To install the Phidget22 Python module with PIP, simply open the Command Prompt (press the Windows key and search for cmd), and enter the command:

python -m pip install Phidget22

Setting Up a New Project

When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Python library.

To start, create a new Python project:

Setting Up a New Project

Next, add a new file to the project:

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

If it's unclear what any of the options do, click on the nearby '?' for more info.

Once you've made your selections, click the copy button and paste the code into your new project.

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

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Language - Python

Windows with Visual Studio

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

Visual Studio is an IDE provided by Microsoft that can be used to develop code in a wide variety of programming languages, including Python.

Installing the Phidget Python Module

First, install Python3 if you haven't already.

You can install the Phidget22 libraries and python module for your current Visual Studio project with PIP by opening View > Other Windows > Python Environments

Installing the Phidget Python Module

Next, select Packages (PyPI) from the drop-down menu:

Installing the Phidget Python Module

Type Phidget22 into the search bar, then click Install Phidget22:

Success! Your project now has access to Phidget22.

Setting Up a New Project

When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Python library.

To start, create a new Python project:

Setting Up a New Project

Then open the Python file that was generated with the project.

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

If it's unclear what any of the options do, click on the nearby '?' for more info.

Once you've made your selections, click the copy button and paste the code into your new project.

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

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Language - Python

Installing the Phidget Python Module

You can install the Phidget22 libraries for your current Visual Studio project with PIP by opening View > Other Windows > Python Environments

Installing the Phidget Python Module

Next, select Packages (PyPI) from the drop-down menu:

Installing the Phidget Python Module

Type Phidget22 into the search bar, then click Install Phidget22:

Success! Your project now has access to Phidget22.

Setting Up a New Project

When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Python library.

To start, create a new Python project:

Setting Up a New Project

Then open the Python file that was generated with the project.

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

If it's unclear what any of the options do, click on the nearby '?' for more info.

Once you've made your selections, click the copy button and paste the code into your new project.

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

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Language - Python

Installing the Phidget Python Module

To install the Phidget22 Python module without PIP, you need to download it here:

● Phidget22 Python Module

Unpack the Phidget22 Python module and open the Command Prompt (press the Windows key and search for cmd). Find the folder where you downloaded the Python module and enter this command:

python setup.py install

This will build the module and install the Python module files into your site-packages directory.

Setting Up a New Project

When you are building a project from scratch, or adding Phidget functionality to an existing project, you'll need to configure your development environment to properly link the Phidget Python library.

To start, create a new Python project:

Setting Up a New Project

Then open the Python file that was generated with the project.

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

If it's unclear what any of the options do, click on the nearby '?' for more info.

Once you've made your selections, click the copy button and paste the code into your new project.

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

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Language - Python

Windows with IDLE

Welcome to using Phidgets with Python! By using Python, you will have access to the complete Phidget22 API, including events.

IDLE is a cross-platform development environment for Python targeted at newcomers to the language.

WARNING: We do not recommend using Idle with Phidgets. It has known problems dealing with multiple threads, which is a required feature if your program uses events.

Installing the Phidget Python Module

First, install Python3 if you haven't already.

Python 3.4+ includes PIP by default. To install the Phidget22 Python module with PIP, simply open the Command Prompt (press the Windows key and search for cmd), and enter the command:

python -m pip install Phidget22

Finding Code Samples

To find the code sample to use for your Phidget, navigate to the Code Samples page and select your device from the drop-down menu.

Once you select your device, the code sample generator will give you a working code sample, and a selection of options to customize it to your needs.

Using the Code Samples

If it's unclear what any of the options do, click on the nearby '?' for more info.

Once you've made your selections, click the copy button.

Using the Code Samples

Paste the sample code into a new Python script file in IDLE:

Using the Code Samples

To run the example, simply click on Run and select Run Module:

What's Next?

Now that you've set up Phidgets in your programming environment, you should read our guide on Phidget Programming Basics to learn the fundamentals of programming with Phidgets.

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Quick Downloads

If you already know what you're doing and just need the files, you can find them all below.

Python Package

It is recommended to follow the instructions in the setup guide above and use PIP to install the python package, but if you need the source file, you can download it here.

Documentation

Example Code

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