What bothers me, is that Webpal does not have battery backed clock. Anybody knows some cheap, preferrably serial clock chip? Its a pity to spend $10 for Dallas chip when paid just $8 for the whole thing.
I don't know of a good hardware solution, but I run ntpdate at boot-time, to synchronize to an ntp server. Of course, it does require an internet connection. I'm running Debian Potato and use the package that came with it. I also tried running the local daemon (ntpd), but it (like several other packages from Potato) crashes on startup.
Well, ntp use does not help if I want one of them to be a standalone controller. So far, the cheapest I could come up with is 8 pin PIC processor with 32,768 crystal & battery. That adds up to about $4 plus PCB price. I'm wondering, could it be done cheaper.
I'm sticking a $15 GPS board in mine. It's one of the Motorola Oncore boards that are becoming common. The I/O is already CMOS levels, so I don't even need the MAX232's. :) There's room for a small patch antenna inside the case, even. :)
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