Where Can You Buy Cheap, Tiny Motherboards? 60
Adam Ernst asks: "I'm trying to build a low-end tablet PC type device for giving tests to students in a classroom. The touch screen TFT wasn't hard to get and the WiFi shouldn't be too hard either, but the most difficult part has been finding a motherboard! I tried Via's Mini-ITX, but it was too tall at about 1.5 inches. The motherboard needs to be just three quarters of an inch tall; the length and width can't exceed 8 inches each, but the smaller the better. No fans allowed--this has to be silent. The -only- requirements feature-wise are that it is able to connect to a TFT-LCD, has either USB, CompactFlash, or PCMCIA for WiFi, and has enough power to run Red Hat or SuSE (the only Linuxes my IDE supports). No ports, no ethernet, not even sound. Preferably it would take straight power (just one wire in and one out, at some set voltage) so I don't have to mess with power circuits. Of course, the most important factor of all is cost, since it's for schools (preferably less than $100 in small quantities ~90 units)."
Soekris Engineering? (Score:2, Informative)
http://www.soekris.com/
They could probably build you a board, though it will not be less than $100.
Good luck.. I am looking for a similar board though I need 4 serial ports on mine.
PC104 (Score:5, Informative)
Ive actually been compiling a small start off list, as I was researching them for robots.
http://www.advantech.com/products/sub_category.
http://www.bwi.com/
Also, I have various manufacturers of small form factor PCs that might be worth looking into (last ditch effort, ask where they get parts, or glue the lcd to one of them):
http://www.iwillusa.com/products/ProductDetail.
http://www.norhtec.com/products/index.h
http://www.openbrick.org/
http://www.littlep
Two options (Score:3, Informative)
Re:Ummm... (Score:2, Informative)
Adam Ernst
What about old Iopeners? (Score:2, Informative)
If you're lucky you might be able to find enough of these used to build your project around them, at least if it's a limited batch of 20-30 units. They usually sell in the $50-$80 range on eBay and surplus stores.
Not at that price point (Score:4, Informative)
Like a previous poster mentioned, the only way you're going to find a device for around $100 is by buying bulk, used PDAs from eBay and they're still not going to do what you want them to. Hell, the PJRC [pjrc.com] costs $150 alone, and it's only an MP3 board.
Re:What about... (Score:3, Informative)
Single Board Computers (Score:2, Informative)
I would also start checking out wearable computing sites and lists. The list to read is wear-hard [blu.org].
Bitsy and friends (Score:2, Informative)
Wanna make it cheaper at a cost? (Score:4, Informative)
Check out the SOC that is SiS 550. Its one chip that has the whole mobo on it and you only need to add IDE, TFT and RAM. In alrge quantities it was around $50, so you can do that under $100 but not in ~90 quantities.
Dont even consider PC104. Gathering used PCs is a lot cheaper, even basic taiwanese ECS-type mobos are cheaper there. Dont worry too much about fan and size for schools, else the price shoots up.
If youre into building embedded systems that can run Linux and uses tiny-X, you're in my league. I'm aiming for ~$50 for large quantities in low res LCDs using ARM MCUs. The cheapest Ive come across are ARM7TDMI MCUs designed for printers by samsung (~$7 each) but the ideal was cirrus logic (~$20) and includes ethernet and is quite fast.
For flash use Intel boot block. Others are expensive and low performance. Should really use compactflash since that will help change programs/OSes in the final product. Currently I'm seeking lowcost keyboard and mouse manufacturers in eastern countries and their quotes in ~1000 quantities. It should be possible they could use my autocad designs in which case I could really build a customized system.
In the not-quite-so-small category (Score:3, Informative)
I believe the low-end ones are a little above $100 including CPU. A small Flex-ATX power supply runs $40. Smaller solutions (DC/DC power supplies plus 12V wallwart) run $70ish.
http://www.mini-itx.com/ has lots of Mini-ITX projects and info.
http://www.idot.com/ is a good place to get Mini-ITX goodies in the U.S.
Design it yourself at ExpressPCB.com (Score:2, Informative)