A "hat" is an add on board designed specifically to fit on top of the pi via the GPIO header. They have a small EEPROM chip which is used to configure them, but may be built to serve any purpose.
Questions tagged [hat]
130 questions
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Hat for shutting down the Pi with a button
Are there any Raspberry Pi hats which allow to shut down the Pi by pressing a button ?
Are there any DIY open hardware projects which describe step-by-step how to build such a hat ?
martin_0004
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Are HATs not supposed to be stackable?
From reading the HAT spec, the ID EEPROM is fixed at address 0x50. This implies that only one real hat may be present at a time, yet lots of products are called HATs and say that they can be stacked, for example,…
JayEye
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Finding EEPROMS suitable for HATs
I'm working through the HAT design guide to work out what kind of EEPROMs I can use.
To quote it:
24Cxx type 3.3V I2C EEPROM must be used (some types are 5V only, do not use these).
The EEPROM must be of the 16-bit addressable type (do not use ones…
Jodes
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