Amazon.com: Stack HAT I/O Expansion Connector for Raspberry Pi 5 Sets of 2x20 Pinheaders Stack up to 5 Hats at Once Directly Pluggable @XYGStudy : Electronics
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/i/182143/products/2022-07-24T18%3A13%3A02.072Z-IMG_1063.JPG?1658661306 "Raspberry Pi SPI I/O Expander hat (5V/3.3V compat) from Milk Factory Computers on Tindie")
Raspberry Pi SPI I/O Expander hat (5V/3.3V compat) from Milk Factory Computers on Tindie
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IO Expansion HAT for Raspberry Pi 4B/3B+ - DFRobot
Pi HAT with 16 opto-isolated inputs can stack for up to 128
