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Adafruit PCF8574 I2C GPIO Expander Breakout [STEMMA QT / Qwiic] : ID 5545 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Control Any Devices Using Raspberry PI and PCF8574, Relay Module : 6 Steps (with Pictures) - Instructables
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Control Any Devices Using Raspberry PI and PCF8574, Relay Module #piday # raspberrypi @Raspberry_Pi « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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GitHub - oweidner/i2crelay: A Python library and command line tool to control PCF8574 I2C relay boards
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