Cabling for 40-Pin Raspberry Pi Models (A+, B+ and 2 B)

The newer Raspberry Pi models have a 40-pin J8 expansion header, as opposed to the 26-pin P1 expansion header of the original Model A and Model B. The LPC1114 I/O Processor Expansion Board is shipped with a 26-pin cable, which will require some modification to connect to the 40-pin J8 expansion header.

Possible solutions:

• Use a downgrade cable like this one from adafruit.
• Use a straight 40-pin cable like this one from adafruit. The lower end of the 40-pin connector will hang over a clear space on the LPC1114 I/O Processor Expansion Board.
• Crimp a 40-pin connector onto the supplied cable, just inside of the existing 26-pin connector on the Raspberry Pi end. When you plug the 40-pin connector onto the Raspberry Pi 40-pin J8 expansion header, the 26-pin connector will dangle over a clear space on the board. Such a cable will work with any Raspberry Pi.
• Clip pins 27 and 28 on the Raspberry Pi 40-pin J8 expansion header, to make room for the end of the 26 pin connector on the supplied cable. This is the easiest solution, but will render the Raspberry Pi unable to detect a HAT at a later date.