How can I properly connect the GPS from parallax to the parallax board?

Comments

• Mike Green Posts: 23,101

  2008-04-08 00:49 edited 2008-04-08 00:49

  If you're talking about Parallax's GPS board, download the documentation from the product's page on Parallax's webstore page. It will have the connection information. If you have some other GPS device, the connection scheme depends on the GPS device.
• tmd13 Posts: 16

  2008-04-08 03:49 edited 2008-04-08 03:49

  The problem is that i want to use resistors to protect my parallax board and my gps too. All of them are from parallax, so what tpe of resistors should i use??
• Mike Green Posts: 23,101

  2008-04-08 04:00 edited 2008-04-08 04:00

  Generally you can use 270 to 330 Ohm series resistors in a 5V logic circuit. These will limit worst case fault current to 15-20mA which most logic outputs can sustain indefinitely. There are a few Parallax devices where this won't work like the Parallax Servo Controllers, but the GPS device should be fine.
• tmd13 Posts: 16

  2008-04-08 04:11 edited 2008-04-08 04:11

  Thanks I appreciate your help.
• tmd13 Posts: 16

  2008-04-08 04:14 edited 2008-04-08 04:14

  One more question, the serial I/O where is supposed to be connected??
• Mike Green Posts: 23,101

  2008-04-08 04:19 edited 2008-04-08 04:19

  The serial I/O gets connected to whatever I/O pin that you program for that purpose. If you're going to use an existing sample or demonstration program, use the I/O pin that the program uses (or change the program to match where you've connected the serial I/O signal). READ THE DOCUMENTATION!
• tmd13 Posts: 16

  2008-04-08 04:34 edited 2008-04-08 04:34

  Im trying to run one of the examples program from parallax for the gps, but it keeps answering me " ? " instead of giving me a position
• steve_b Posts: 1,563

  2008-04-08 12:18 edited 2008-04-08 12:18

  Are you running the gps indoors?
  The gps is looking for satellite signals, and should have a relatively clear "sky view".
  
  You've gotten far enough to be able to load your program in to your stamp....read a little further and learn how to program it; that'll help you in knowing where to look for the code portion that shows which pin its expecting the gps to be connected to.
  
  Incidentally, if you use the help function and look up the SERIN instruction, you'll get a clue as to where (in your program) to look for the pin declaration.
  
  ps.Parallax offers a lot of their documentation for free. I'd strongly suggest you read the "What's a Microcontroller" text from their website....
  
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