‍PsychoPy provides built-in support for input from Cedrus’ response pads.

‍To send TTL event markers via an RB-x40 response pad, you need to use our free pyxid2, a Python library that is included with PsychoPy.

‍The screenshots on this page are with PsychoPy version 2020.2.10. Before proceeding:

‍    Download PsychoPy sample code

‍PsychoPy for Windows

‍Assuming that PsychoPy 3 is installed:

• Click on the Windows Start menu and run PsychoPy3.
• In PsychoPy3, click on the Window menu and select Coder. A new “PsychoPy3 Coder” window opens.
• In the Coder window, click on the File menu and select Open….
• When prompted for the location of a file, select the file that you had just downloaded and click on Open.
• In the toolbar, click on the green Run experiment icon.

‍The sample code will turn the output lines one at a time  for 300ms.

‍PsychoPy for Mac

‍Assuming that PsychoPy 3 is installed:

• Run PsychoPy3.
• In PsychoPy3, click on the View menu and select Open Coder view. A new “PsychoPy3 Coder” window opens.
• In the Coder window, click “open” icon.
• When prompted for the location of a file, select the file that you had just downloaded and click on Open.
• In the toolbar, click on the green Run experiment icon.

‍You might get an error message like this one:

‍   OSError: ftd2xx drivers are not installed (or not in expected location) and these are required for the Cedrus pyxid2 library.
   ** Download from https://www.ftdichip.com/Drivers/D2XX.htm **
   ##### Experiment ended. #####

‍If you do, download the required USB driver, install it, and try again.

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Last Revision: Jan 18, 2021