This is the implementation of the Roomba Virtual Wall on Raspberry Pi Pico using Micropython.
That was properly tested in my Roomba 690.
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Micropython
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Raspberry Pi Pico
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IR Transmitter
In my case, I used the one below, but it should work with others out of the box.
To setting up your environment, you case use https://github.com/cpwood/Pico-GO
https://sites.google.com/site/irobotcreate2/createanirbeacon