Thread: Looking for low power 24/7 Bluetooth Capable Computer

Hi

i am looking for a computer or similar thing that will run off my car battery (or any additional battery that can be charged from my alternator) as long as possible (i am talking days or weeks, not minutes or hours).
i need the folowing minimal features:
- 1 RS232 Port (or any other possibilty to switch some relais)
- Bluetooth (large ranges preferred)
- Web-Server or any other tcp-ip capabilities, to exchange data through a GPRS Connection with my Home PC or directly with any Wap-Cellphone
- Some not too complicated way to programm it (i.e. no assambler, but c, java, basic would be fine)

the goal of the sytem will be to be able to unlock and start my car through bluetooth (with a ericsson t68-i Cellphone --> i already know how "talk" to my cellphone (through at commands you can display messages and questions and stuff) ) plus i want to be able to switch my Webasto Heating on and off. any other function aso for example opening and closing the sunroof will be appreciated but is not really needed.. so far i could stick with many little controller units (as for example the german c-control unit (http://www.c-control.de)) but i also want to be able to control at least the heating system through a wap interface. therefore i have my webserver at home which would be able to generate the wap pages, in case there is no web-server on this specific device. but it needs to be able to communicat through tcp/ip because i want to have it connected all the time through GPRS, which is charged by kilobyte and not by time, and this, as far as i am informed, only supports tcp/ip.
what's more, the whole system should not cost thousands of dollars. i don't need any display or anything like this and the size does not matter too much (of course should it not be a big-tower or something like this, but i don't care wheather it fits in a mini-itx case or a matchbox) the price of the system should be less or at most 500$ i'd say.
sometimes my car is not being moved for say 4 days. usually i drive it daily.


are there any suggestions for such a system? would a nokia communicator or their picture-phone do the job? (here in switzerland you get cellphones really cheap if you sign a one year contract, which i need anyway to get my stuff connected. i do have an old ericsson t39 phone wich i could use in my car, this does not have to be added to the installations price :-) )
what about one of the slower via eden's? They probably draw too much i guess..

any suggestions for additional battaries?

hope to hear some ideas

pascal