32 チャンネル デジタル拡張 HAT Raspberry Pi用

some assembly required, but it's straightforward. Manufacturer support is excellent, prompt, and detailed.

It is great to have the ability to expand the Raspberry pi GPIOs using this product.

After Enabling I2C and downloading a small library, you'll be up to your ears in IO. You'll probably need a header extension it's a tight fit on a PI3b+.

Used it to simplify encoder wiring. I wish they would provide options to route interrupts to select RPI pins via solder jumpers. Instead the INT signals are routed to the respective IO headers, which defeats the purpose