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OBEX for Prop GPS — Parallax Forums

OBEX for Prop GPS

NWCCTVNWCCTV Posts: 3,629
edited 2013-09-26 20:40 in Propeller 1
I picked this up at the Shack today for $10.00. Where is a good place to start using a Prop? The only link in the downloads section is to stamp code. I would like to start out with just the basics and have the data shown on the PST.

Comments

  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2013-09-26 16:45
    NWCCTV wrote: »
    I picked this up at the Shack today for $10.00. Where is a good place to start using a Prop? The only link in the downloads section is to stamp code. I would like to start out with just the basics and have the data shown on the PST.

    NOTE: I used a 10k resistor between the GPS yellow lead and the prop pin.

    Since it's simply a serial interface, I didn't really see the need for an object

    Here is a simple example displaying and parsing the RMC an GGA sentences
    spin
    spin
    GPS1.spin
    5K
  • NWCCTVNWCCTV Posts: 3,629
    edited 2013-09-26 16:51
    I thank you sir. I will test it out shortly.
  • NWCCTVNWCCTV Posts: 3,629
    edited 2013-09-26 17:25
    OK, Either I am doing something wrong or I have a bad GPS. I have 10K resistor on Pin 0 to yellow wire of GPS, Blue wire to Pin 15, Red wire to 3.3V and Black to Ground. I have changed the Baud in PST and the only one that does not scroll with odd ball characters is 115200 and that only shows the number 255. Any suggestions?
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2013-09-26 17:33
    You don't need the blue wire (see http://learn.parallax.com/KickStart/28500)

    The yellow wire goes to pin 15

    The red wire needs 5V not 3.3V. CORRECTION: it is supposed to work with 3.3V or 5V
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2013-09-26 17:47
    The TX_Pin constant was left in when I stripped out the LCD code I was working on earlier.

    I used the resistor because I was powering the GPS and LCD from 5V on a breadboard.
  • NWCCTVNWCCTV Posts: 3,629
    edited 2013-09-26 17:48
    Got it. Thank you. Just one question, what is TX for if it is not used?
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2013-09-26 17:53
    The data is not reliable until the status byte changes from "V" to "A" in the RMC sentence.
  • NWCCTVNWCCTV Posts: 3,629
    edited 2013-09-26 17:58
    OK. I tried the code on the Kickstarter page but I noticed they do not show a 10K resistor in place. Would this be the reason I can not get that code to run?
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2013-09-26 18:13
    I think they are using 3.3v and don't need the resistor.
    I don't know anything about that code. I basically converted the Stamp code.
  • NWCCTVNWCCTV Posts: 3,629
    edited 2013-09-26 18:13
    Cool. Thanks for the help. I have both your code and the code from Parallax working. So, what does time mean? Is that suppose to be actual time or is that part of the reading also?
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2013-09-26 18:21
    Read the docs at http://www.gpsinformation.org/dale/nmea.htm#RMC - it is UTC
  • NWCCTVNWCCTV Posts: 3,629
    edited 2013-09-26 20:40
    Got it. Thanks for all the help. Will mark as solved.
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