Hi
i was wondering how small is the smallest Arduino board? and would it fit in a watch?
Thanks
Paul
The smallest board I know of is the LilyPad; but given the size of that thing and the amount of empty space, you could probably shrink things further, certainly down to the size that would fit inside a watch case. Everything would have to be surface mount, of course, and you would probably have to use the smallest components you could find (which would probably rule out hand-assembly, but maybe not). Adding other things onto the device to make it more useful (wireless, gps, accelerometer, etc) might almost be out of the question, at least at the homebrew level. What are you planning on building, anyhow?
There is not a 'board' as such that would fit in a watch but an SMD ATmega 328 and some other surface mount components to make your own arduino board should fit on a custom board (unless you have a tiny watch...
The battery would be the biggest thing.
Maybe you want to take a look at:
to give you some ideas
Mowcius
How about this:-
from
but it's not an arduino. 
The smallest actual board I know is the Teensy. It's about the size of a Mini Wheat. It's a fully functional Arduino, including the USB. You clearly could make something smaller than that if you didn't need the usb. On the other hand, that means you have to program the AVR using something like probes on the PCB, because a header is about the same as the USB connector on the Teensy.
you can power one from a watch battery.
The obvious question is what kind of IO you need, 'cause that may be the real problem.
Hi Thanks everyone for all the input! i am Product design student and i am planning ob building a watch using arduino so iwas wondering how small they could be!
Thanks
Paul ;D
i just checked the teensy board! looks good! ill look into farnell too! thanks again
paul
How about this:-
(img)
from
http://uk.farnell.com/jsp/search/browse.jsp?N=500006+1004574&Ntk=gensearch_001&N...
but it's not an arduino.
That is cheap for an LCD, battery, accelerometer, pressure sensor, wireless etc. I may get myself one of those. Has anyone got any experience with one?
What does it use for programming? Could an arduino send wireless data to it? (2.4GHz?)
Mowcius
Mowcius
Mowcius, it looks like it can communicate with Zigbees, but it's getting a bad reputation for its software development toolchain.
See http://wiki.msp430.com/index.php/EZ430-Chronos?DCMP=Chronos&HQS=Other+OT+chronoswiki#Robertjw_said_..._2 and keep reading the other comments on that page if you're seriously interested.
Mowcius, it looks like it can communicate with Zigbees, but it's getting a bad reputation for its software development toolchain.
Well their not too much so I might pick one up for a play 
[edit]
Ok, after reading through all that linked stuff it looks like a bad idea as the software is limited and most people are having some real issues with no support from TI. >:([/edit]
Mowcius
I have one of these now and it's a great little idea starter but I'm going to shelve it for a while because it's really oriented toward watch-to-Windows PC communications.
There's a gang of people poking at it though and I'm sure we'll see some opening up soon.
There's a gang of people poking at it though and I'm sure we'll see some opening up soon.
Yeah let the gang of people sort it out first
Mowcius
With me recently having bi-pass surgery, this watch looks very interesting.