An additional Arduino example. Arduino might be the best way to go for low cost, customization, and the explicit capabilities. http://publiclaboratory.org/tool/balloon-telemetry-kit <http://publiclaboratory.org/tool/balloon-telemetry-kit>
<http://publiclaboratory.org/tool/balloon-telemetry-kit> On Tue, Feb 1, 2011 at 9:47 AM, Miten Sampat <[email protected]> wrote: > Another option is to look at building it with Arduino and one of the GPS > modules that go with it. > > More on HTTP://www.arduino.cc > > Goodluck, > Miten > > miten sampat | HTTP://about.me/mitensampat > On Feb 1, 2011 9:44 AM, "Brian Russo" <[email protected]> wrote: > > In the volumes you'd be purchasing you can get OEM GPS devices with a > > usb or RS232 interface for around $30-35. > > > > Battery life is going to be simply dependent on the size of the battery > > I wouldn't bother with buttons, just have it start feeding when the > > power source is connected. Or implement a switch. There's no reason to > > have it on when it's not doing anything. > > > > Accuracy is a function of many things, but CEP <30m is quite > > achievable with even the cheapest OEM device under most circumstances. > > > > I doubt you're going to be able to build one with a transmitter for > > <$50 in small volumes though. It's not really sensible engaging in R&D > > for something like this unless you have specific requirements or are > > going to build large volumes. Too much hassle unless you're going to > > build hundreds or have unusual requirements (size, form factor, etc). > > > > You can get little zoombak trackers or garmin gps dog collars for > > around $80-100. There are many systems like this (just google gps > > tracking beacon or something), most involve a subscription around > > $10-15/month. That's probably your best bet. > > > > Here's an example - http://www.zoombak.com/products/universal/ > > > > - bri > > > > On Tue, Feb 1, 2011 at 7:24 AM, Paul Faunik <[email protected]> > wrote: > >> > >> I'm looking to build a location transmitter that would have the > following > >> constraints > >> > >> - low cost (sub $50) for the hw > >> - long battery life. based on the device broadcasting location every 5 > min > >> and doing nothing else. days between charges? > >> - two simple buttons : start broadcasting : stop broadcasting > >> - the geo coordinates are relatively accurate most of the time - 30 > meters > >> (used almost exclusively outdoors in San Francisco) > >> > >> One thought is it could some super cheap older model cell phone, some > simple > >> native app to send geo coords to web service or send sms (if this > >> circumvents a data plan), super cheap pay as you go phone plan, put it > all > >> in a box and just expose two buttons and the charging plug. > >> > >> Other alternatives? > >> > >> Anyone ever built or heard of such a project? > >> > >> thanks, > >> > >> Paul > >> > >> > >> _______________________________________________ > >> Geowanking mailing list > >> [email protected] > >> http://geowanking.org/mailman/listinfo/geowanking_geowanking.org > >> > >> > > > > > > > > -- > > Brian Russo / (808) 271 4166 > > > > _______________________________________________ > > Geowanking mailing list > > [email protected] > > http://geowanking.org/mailman/listinfo/geowanking_geowanking.org > > _______________________________________________ > Geowanking mailing list > [email protected] > http://geowanking.org/mailman/listinfo/geowanking_geowanking.org > >
_______________________________________________ Geowanking mailing list [email protected] http://geowanking.org/mailman/listinfo/geowanking_geowanking.org
