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SparkFun USB to Serial GPIO Breakout - CP2103 - BOB-00199 - SparkFun Electronics
8 Channel USB GPIO Module With Analog Inputs | Numato Lab
Adafruit FT232H Breakout - General Purpose USB to GPIO, SPI, I2C [USB C & Stemma QT] : ID 2264 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Cerevo FlexTally GPIO/USB Converter for Select CDP-FT01-VMON B&H
Numato and Pi Supply generic USB GPIO boards
BrightSign GP800-C USB-C To GPIO Adaptor 12-pin Cable Kit | Full Compass Systems