I'm looking for a relatively simple (and hopefully inexpensive) OEM-style cellular modem that can work in conjunction with a PIC-based remote data-acquisition unit.
Data transmission speed doesn't have to be very high at all, 2400 baud would be more than enough. The data only needs to be sent maybe twice a day, preferably by calling the cell-modem to wake up the PIC device and initiate transmission.
I've looked into using 'smartphones', but the phone companies always insist on selling you an expensive internet-access subscription (that's where they really make their money). Non-'smart' phones require a Winders-based PC and drivers to serve as a modem.
Yea, a PIC can be linked through and/or operated by one of those phones over USB or bluetooth, but the whole thing is *serious* overkill. As I intend to install twenty or thirty stations right off the bat, internet-access rates would just *destroy* the budget. I don't NEED an interactive web page at every site.
I've seen a few such modems on the net, but they never list prices ... apparently they want to get you on the phone for the big sales speil. I'd be interested in hearing from anyone who's bought and used these things - price, performance and gotcha issues.
Something like Global-Datas 'StarPoint' or OEM units are what I have in mind :
Any info helpful.