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The Pi Beret!
Adafruit EYESPI Pi.
The Pi has always had HATs, but what if you made a cute, thin HAT – would it be a beret? That’s what Adafruit is betting on with its tiny GPIO HAT-like board. It provides an 18-pin SPI port, SDA/SCL I2C port and a couple of useful buttons and status lights, and costs as little as £5.