The Raspberry Leaf is an idea created by Simon Monk (a very well established tech writer – has written books on learning Python with both the Raspberry Pi and Arduino, among many more) to enable easier and quicker interfacing and breadboarding with the Raspberry Pi.
Printing and using the Raspberry Leaf is an extremely cheap way to avoid making potentially fatal mistakes when prototyping as well as just helping to streamline your prototyping operations.
Since then many people have added to this great idea, and there is now a version which as well as the Raspberry Pi GPIO pin numbering also includes WiringPi and Quick2Wire numbering as well to allow for maximum compatibility with whatever system and add ons you are running.
The drawback with using Male to Female jumpers direct onto the GPIO is that you then have to count down the pins trying to find the pin you need, because nothing is labelled. Matching a diagram of the pinout to the actual pins is not easy and mistakes can be made.
When I first saw this it was one of those “why didn’t I think of that already?” moments (I seem to be getting these more and more frequently since the Raspberry Pi arrived!) which will certainly make my life a lot easier and Raspberry Pi interfacing a lot quicker.
There are four different versions listed below (PNG images embedded to click and save, and PDF copies linked for download) – these are for the Rev1 and Rev2 boards both with and without the WiringPi and Quick2Wire editions:
You can also find Dr Simon Monk’s original post on the Raspberry Leaf designs here – http://www.doctormonk.com/2013/02/raspberry-pi-and-breadboard-raspberry.html