If I remember right, there is a bunch of info somewhere on the Electric Imp site, possibly in the Wiki or in one of the forums.
If you have been using an Imp already with the April Breakout board or Arduino shield from Sparkfun or Adafruit and have got used to the Planner system and Squirrel programming language then you should be ok. The pins, sensors and everything else that needs ID is clearly marked on the board (based on the pictures) and the full circuit diagrams as well as the PCB files are available here and on the Smartmaker site at the bottom on the Hannah Board Page to refer to for diagrams for how each Input/Output is connected. The Electric Imp its self is well documented here and on the pages of most retailers who stock it, they generally have the diagrams and pin information as well as alot of other stuff on sites like Adafruit and Sparkfun where they have their own “April” Boards/Breakouts and infact Adafruit has a load of info on using the Imp on its learning system pages.
There is a bunch of info here on the E.I. site for using an Imp including all the Pin functions etc and lots of examples for getting used to it and to get you on your way with some simple examples. There is even a demo example for the Hannah available from your Planner page if you click on the Code button and select Hannah.
Adafruit and Sparkfun both also have guides to get you started with an Imp.
If you haven’t used an Imp before in the standard April breakout or other Impee (Device/Board designed for an Imp to work in/with) then you should probably grab one or at least read up on how it works and there are a ton of example projects online of people using April + a few for Hannah as well as other Impees.
As Hugo has said, Hannah boards were designed for the Electric Imp Dev Team to test functions and ideas. It was released in a small number last year to the people who were on board with the imp already. Because of this there is not a lot of info about using the Imp in a Hannah board and its going to be a bit of trial and error for all of us and a lot of checking the data sheets for the sensors and IC’s that have been used.
These days the Imp is out there in pretty good numbers and has been implemented in 100’s of published projects using the April (or self built similar boards) and there is alot of support on the forums. There are projects that use the Imp and the sensors that are included on Hannah so write ups about those will be good places to look for info on the actual function and control of specific parts.
The Hannah is a kind of all in one board with sensors for most things that electronic projects and products use on board to be able to try out ideas without having to build a circuit up on your breadboard over and over again. Once you have nailed your idea down through using Hannah it generally leads to it being moved on to a prototype using an Imp in either the simple April breakout or a custom made board and then building the design up using the different components that you may have used on Hannah or close to them.
As I said, if this is the first time you are using an Imp then have a good read up on it first and also I would advise getting yourself an April Board to learn the basics. If not it will definatly make your head spin while you learn the system and figure things out. When I got my first Imp along with a Sparkfun Breakout Impee it dis-oriented me a little for a while, but it just needs a bit of reading up on and jumping in to do a few basic tasks using the Planner, an Impee, Imp and some basic components on a bread board.
All the sensors and inputs/outputs on the Hannah are current production and have extensive data sheets and are used in alot of other popular MCU based projects and products, so plenty to refer to.
It is a fairly technical Development board designed originally for the Imp development guys so it is going to be a bit hit and miss and alot of reading up on individual functions then working the Squirrel code to communicate the data between the Sensor/input and the Imp and then the Imp via the internet to the Planner cloud where you can then redirect data in and out to other services. The actual Hannah board and its various circuits are not particully complicated and are likely similar to those you have used with other MCU’s as the main work is done on the Imp’s board (inside the white case) and in the programming on board and on the cloud. It should be a nice little prototyping and developing environment especially with the upgrades and overhauls of a couple of the sensors.
Its a cool system once you get used to using the Planner and get your head around the Squirrel code which is pretty user friendly and similar to C type programming languages with alot of extras in there similar to various other systems that make it a pretty nice environment to work in. Its going to be so nice having all that gear inc power on just the one board along with plenty of pins to breakout to another device or circuit.
Again if you haven’t used that before then head to http://squirrel-lang.org/ and get read up on using it and implementing it for use with your Imp and Impee.
Of course there are the Forums here and at Adafruit, Sparkfun and Squirrel where there are users who will be able to help you out.
I cant wait to finally get mine after just under a year of hunting down one of the originals with no luck. I was getting ready to have a small batch of PCB’s made when I saw that Smartmaker had partnered with Electric Imp on the Smartduino and then later when Dimitri announced they were making a batch of boards based on the original Hannah design and then hearing that they were improving the design to make it even more versatile.
This last few months have been a long wait and im so glad to finally see light at the end of the tunnel and soon have my nice new Hannah in my hands!