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Arduino light flicker using Psychopy?

What are you trying to achieve?:
I am running a project in which I need to produce a stimulus that is flickering at a certain frequency (i.e. 20Hz) but this needs to be a small LED light connected to an Arduino circuit board. I have managed to do this with the use of a python code I have written, but I do not know how to use Psychopy to communicate with the board.

I tried to the Arduino into the USB, but could not set up the communication.