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I ran out of GPIO on my RPI and now looking for a module to converts USB to GPIO for my Raspberry. I am not interested in converting GPIO to USB, but interested in USB to GPIO. I've been googling for some time but haven't found anything like this. Do you maybe know if a product like this exists, that I can connect to my raspberry, and use some extra, additional GPIO ports?

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You can connect a Pi Zero via USB to your current Pi. That will give you 26 additional GPIO.

https://gpiozero.readthedocs.io/en/stable/pi_zero_otg.html

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You are extremely unlikely to find any such device.

Most of us would use a GPIO extender. There are several that work over I²C.

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