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HATs On for the Raspberry Pi [message #157239] Fri, 29 August 2014 12:21
Messages: 124
Registered: November 2008
Senior Member

by elektor.com:
Arduino has its shields, the Beaglebone Black its capes and up until recently the Raspberry Pi just had expansion boards. The latest B+ version of the Pi comes with more I/Os increasing the pin count to 40 of which 26 are backward compatible with the original connector fitted to the A and B boards. Two of the extra pins ID_SC and ID_SD are data and clock lines to connect to a serial EPROM fitted to the expansion board, sorry HAT. 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 appropriate driver.
HATs On for the Raspberry Pi - [Link]Original article at http://www.electronics-lab.com/blog/?p=30263.

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