HP Forum Archive 19

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HP50g and GPS reciever Message #1 Posted by Matthew Krotzer on 19 Sept 2010, 1:45 p.m. I'm considering the purchase of an hp50g that I do not need but will prove to be useful microcomputer for future. I'm not much past a basic calculus course but have the opportunity to learn linear algebra on the side with a professor in preparation for undergraduate research in sociology. I absolutely love RPN on my only hpcalc (35s) A personal project: I would like to interface the hp50g with an gps receiver and have a programmable gps unit to measure m/s and act as a trip log. Ultimately I want something for measuring speed during a skateboard trip and for long automobile trips. I think the calculator route is best because it will allow me to display and process the data as I see fit. Would these modules be suitable for the project? http://www.futurlec.com/GPS.shtml I've looked at the software at hpcalc.org and things look promising for me. As you can tell from my post I am a newbie to hp and know very little about gps units. Matthew

Re: HP50g and GPS reciever Message #2 Posted by Tim Wessman on 19 Sept 2010, 2:22 p.m., in response to message #1 by Matthew Krotzer The only way to do it easily is to have a unit that can output a RS232 signal. That way you can use a cable from hpcalc.org to interface to the 50g. Note that is a special serial cable and not just a direct wired connection. I personally would just recommend a simple unit that has a built in 9 pin serial. If you want a hardened box with space for external batteries, and a place to mount extra internal components, take a look here. I helped develop the software and that device for land surveyors, and I'm sure you can buy one of the plain yellow boxes for a decent price if desired. TW Edited: 19 Sept 2010, 2:24 p.m.

Re: HP50g and GPS reciever Message #3 Posted by Matthew Krotzer on 19 Sept 2010, 2:35 p.m., in response to message #2 by Tim Wessman Quote: I personally would just recommend a simple unit that has a built in 9 pin serial. Thank you for the reply. I failed to recognize that the units I linked to where not standard rs232. By "simple unit" do you mean one of the commercial gps units like a garmin e-trex?

Re: HP50g and GPS reciever Message #4 Posted by Tim Wessman on 19 Sept 2010, 3:04 p.m., in response to message #3 by Matthew Krotzer I meant something that doesn't have a screen, and is supposed to interface with another device like a PDA or laptop. I haven't looked for years at those though. I know there are plenty of bluetooth ones, and used to be plenty of serial enabled devices also. Something like this possibly: http://www.amazon.com/Garmin-18x-GPS-Navigator-Unit/dp/B0016NYHVS/ref=sr_1_3?ie=UTF8&s=electronics&qid=1284923071&sr=8-3 You can probably get a GPS with a screen and software that also supports serial. Then you could use either depending on what you want to do. TW Edited: 19 Sept 2010, 3:07 p.m.

Re: HP50g and GPS reciever Message #5 Posted by Matthew Krotzer on 19 Sept 2010, 3:09 p.m., in response to message #4 by Tim Wessman Thanks again. I understand what you mean.

Re: HP50g and GPS reciever Message #6 Posted by John B. Smitherman on 19 Sept 2010, 5:03 p.m., in response to message #1 by Matthew Krotzer Hi Matthew. If you're interested Professor Gilbert Strang of MIT has provided access to resources from his linear algebra course at: Gilbert Strang's Linear Algebra Course The recorded lectures are available via video and are very useful. Good luck, John

Re: HP50g and GPS reciever Message #7 Posted by Garth Wilson on 19 Sept 2010, 5:26 p.m., in response to message #1 by Matthew Krotzer Quote: A personal project: I would like to interface the hp50g with an gps receiver and have a programmable gps unit to measure m/s and act as a trip log. Ultimately I want something for measuring speed during a skateboard trip and for long automobile trips. I think the calculator route is best because it will allow me to display and process the data as I see fit. Why not just get a GPS unit made for bicycles. They already have things like trip distance, travel time, average speed, maximum speed, elevation gained or lost, etc., etc., with plenty of memory that can be downloaded to a computer to graph the speed, elevation, grade, heart rate, and so on.

Re: HP50g and GPS reciever Message #8 Posted by Martin Pinckney on 19 Sept 2010, 5:38 p.m., in response to message #7 by Garth Wilson Quote: Why not just get a GPS unit made for bicycles. Really, Garth, if you have to ask...

Re: HP50g and GPS reciever Message #9 Posted by Egan Ford on 19 Sept 2010, 9:14 p.m., in response to message #1 by Matthew Krotzer You may or may not find this helpful: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=746 I used an older Garmin GPS that supports RS232 NMEA streaming @ 4800 BPS. Edited: 19 Sept 2010, 9:15 p.m.

Re: HP50g and GPS reciever Message #10 Posted by Don Shepherd on 19 Sept 2010, 9:33 p.m., in response to message #9 by Egan Ford Egan, I've just got to say this. Your article's use of animation is absolutely the best I have seen at this site. You are a true pro, sir!

Re: HP50g and GPS reciever Message #11 Posted by Geir Isene on 20 Sept 2010, 6:35 a.m., in response to message #9 by Egan Ford Frak, that's cool, Egan!

Re: HP50g and GPS reciever Message #12 Posted by Matthew Krotzer on 21 Sept 2010, 10:55 p.m., in response to message #1 by Matthew Krotzer Thanks for all the help. I really appreciate it.

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