Python for LJM - Windows, Mac, Linux

GitHub:

This package is available on GitHub: github.com/labjack/labjack-ljm-python

Prerequisites

• LabJack T7 or T4
• LJM Library - Install the LJM Library
• Python 2.6, 2.7 or 3.x - Download from https://www.python.org/getit
• Operating system - Windows, Mac OS X, or Linux

Instructions

• Go to the T4 or T7 Quickstart Tutorial and follow the steps to install LabJack software and confirm basic operation.
• Open a terminal/console window.
• Install the LJM Python modules with pip, which is commonly installed with Python, using the following command:

  python -m pip install labjack-ljm

  or:

  pip install labjack-ljm

  Run the command with sudo on Linux and Mac.
• Download/extract the .zip file attached at the top of this page for examples and LJM Python source code.
• Alternative to pip for installation, in a terminal/console navigate to the extracted folder and run the following command:

  python setup.py install

  Run the command with sudo on Linux and Mac.

Refer to the download's README.TXT file for requirements, installation, installation troubleshooting, documentation, and license information.

Troubleshooting

If you get the following error:

ImportError: No module named labjack

Make sure you install for the Python version you will be using. For example, on Linux if both Python 2.7 and 3.5 are installed, you can install to Python 3.5 with:

      $ python3.5 -m pip labjack-ljm install

Windows

If running the "python setup.py install" command as described in the above instructions causes the following or similar error:

'python' is not recognized as an internal or external command, operable program or batch file.

That means either Python is not installed on your computer or the Python executable's path was not added to the Windows user or system path. To help resolve this issue, please run the Python Windows installer and in the "Customize Python" window, click the "Add python.exe to Path" option towards the bottom and select "Will be installed on local hard drive".



Then continue the installation as normal. Open a new terminal/console window and then go through our installation instructions again.

Alternatively, after Python is installed you can run the Python executable from its path. For example:

C:\Python27\python.exe -m pip labjack-ljm

Note that the above command uses the Python 2.7 path, and you should use the correct path on your computer which may differ.

Another option is to manually add the Python executable's path to the Windows path as described in the Python documentation.

Code Snippet

from labjack import ljm

# Open first found LabJack
handle = ljm.openS("ANY", "ANY", "ANY")

# Call eReadName to read the serial number from the LabJack.
name = "SERIAL_NUMBER"
result = ljm.eReadName(handle, name)

print("\neReadName result: ")
print("    %s = %f" % (name, result))

File list

Python_LJM_2019_04_03.zip contains:

CHANGES.TXT
LICENSE.TXT
README.TXT
setup.cfg
setup.py
Examples\Basic\eAddresses.py
Examples\Basic\eNames.py
Examples\Basic\eReadAddress.py
Examples\Basic\eReadAddresses.py
Examples\Basic\eReadName.py
Examples\Basic\eReadNames.py
Examples\Basic\eWriteAddress.py
Examples\Basic\eWriteAddresses.py
Examples\Basic\eWriteName.py
Examples\Basic\eWriteNames.py
Examples\Basic\write_read_loop_with_config.py
Examples\More\1-Wire\1_wire.py
Examples\More\AIN\dual_ain_loop.py
Examples\More\AIN\single_ain.py
Examples\More\AIN\single_ain_with_config.py
Examples\More\Config\read_config.py
Examples\More\Config\read_device_name_string.py
Examples\More\Config\write_device_name_string.py
Examples\More\Config\write_power_config.py
Examples\More\DIO\single_dio_read.py
Examples\More\DIO\single_dio_write.py
Examples\More\DIO_EF\dio_ef_config_1_pwm_and_1_counter.py
Examples\More\Ethernet\read_ethernet_config.py
Examples\More\Ethernet\read_ethernet_mac.py
Examples\More\Ethernet\write_ethernet_config.py
Examples\More\I2C\i2c_eeprom.py
Examples\More\List_All\list_all.py
Examples\More\SD\__init__.py
Examples\More\SD\change_directory.py
Examples\More\SD\delete_file.py
Examples\More\SD\get_disk_info.py
Examples\More\SD\list_directory.py
Examples\More\SD\print_working_directory.py
Examples\More\SD\read_file.py
Examples\More\SD\sd_util.py
Examples\More\SPI\spi.py
Examples\More\Stream\in_stream_with_non_looping_out_stream.py
Examples\More\Stream\ljm_stream_util.py
Examples\More\Stream\stream_basic.py
Examples\More\Stream\stream_basic_with_stream_out.py
Examples\More\Stream\stream_burst.py
Examples\More\Stream\stream_callback.py
Examples\More\Stream\stream_sequential_ain.py
Examples\More\Stream\stream_triggered.py
Examples\More\Testing\c-r_speed_test.py
Examples\More\Watchdog\read_watchdog_config.py
Examples\More\Watchdog\write_watchdog_config.py
Examples\More\WiFi\read_wifi_config.py
Examples\More\WiFi\read_wifi_mac.py
Examples\More\WiFi\read_wifi_rssi.py
Examples\More\WiFi\write_wifi_config.py
labjack\__init__.py
labjack\ljm\__init__.py
labjack\ljm\constants.py
labjack\ljm\errorcodes.py
labjack\ljm\ljm.py