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Raspberry Pi B+ add-on boards specification

wlanboy

Content Contributer
Raspberry Pi does now have HATs (Hardware Attached on Top).

RaspberryPi-HAT.jpg

Something we know from Arduino as Shields.

Read their post about all the stuff.

In a nutshell a HAT is a rectangular board (65x56mm) that has four mounting holes in the (nicely rounded) corners that align with the mounting holes on the B+, has a 40W GPIO header and supports the special autoconfiguration system that allows automatic GPIO setup and driver setup. The automatic configuration is achieved using 2 dedicated pins (ID_SD and ID_SC) on the 40W B+ GPIO header that are reserved for an I2C EEPROM. The EEPROM holds the board manufacturer information, GPIO setup and a thing called a ‘device tree‘ fragment – basically a description of the attached hardware that allows Linux to automatically load the required drivers.
You can find the spec at github.
 
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