NMEA from LS20031 error - SparkFun Electronics Forum

NMEA from LS20031 error#150105

By paithew - Wed Oct 03, 2012 2:17 am

- Wed Oct 03, 2012 2:17 am #150105

What happen and how to repair my GPS LS20031

Re: NMEA from LS20031 error#150110

By fll-freak - Wed Oct 03, 2012 4:21 am

- Wed Oct 03, 2012 4:21 am #150110

For the most part, the data looks correct. I might be as simple as a bad electrical connection causing a glitch on the data line. How do you have this GPS connected to the real world?

-Skye Sweeney

http://www.fll-freak.com/blog

Re: NMEA from LS20031 error#150115

By zi[n]or - Wed Oct 03, 2012 6:06 am

- Wed Oct 03, 2012 6:06 am #150115

i used 3.3v from Mini Xbee USB Dongle that same error message too.

Re: NMEA from LS20031 error#150119

By paithew - Wed Oct 03, 2012 6:16 am

- Wed Oct 03, 2012 6:16 am #150119

I used Mini Xbee USB Dongle that use 3.3v connect to GPS.

Re: NMEA from LS20031 error#150120

By fll-freak - Wed Oct 03, 2012 6:21 am

- Wed Oct 03, 2012 6:21 am #150120

From your first statement "What happen and how to repair my GPS LS20031" it would seem that at some point it worked and now it does not. If that is the case, what have you done in the mean time? Added, subtracted, or changed anything at all?

A history of this problem might be very helpful!

-Skye Sweeney

http://www.fll-freak.com/blog

Re: NMEA from LS20031 error#150121

By paithew - Wed Oct 03, 2012 6:38 am

- Wed Oct 03, 2012 6:38 am #150121

I have 4 GPSs. Before they have worked perfectly no problem. And someday they have error all at the same time. I do not change anything at all. I will upload my circuit.

Re: NMEA from LS20031 error#150125

By paithew - Wed Oct 03, 2012 11:40 am

- Wed Oct 03, 2012 11:40 am #150125

this is my circuit

and another xbee (connect to computer) is receiver data from xbee with GPS

Re: NMEA from LS20031 error#150179

By fll-freak - Thu Oct 04, 2012 4:04 pm

- Thu Oct 04, 2012 4:04 pm #150179

I know nothing about Xbees, but I wonder why the 12 ohm resistor to the module. Is this because the xbee needs 3.3V and you hope that the 0.9 volts gets dropped over it? Or is the Xbee a 5V part and you have that resistor there to limit a short circuit condition?

Now I did just look and the GPS module is a 3.3V part with an absolute max input of 4.2V. Cutting things close are we not? Would it not be simpler just to put a regulator into this circuit and have everything working at the correct voltage?

-Skye Sweeney

http://www.fll-freak.com/blog

Re: NMEA from LS20031 error#150255

By Joeisi - Sun Oct 07, 2012 9:19 am

- Sun Oct 07, 2012 9:19 am #150255

I would agree with the above. The XBee does not draw a constant current throughout its operation. Thus, the voltage drop across the resistor will change, making the voltage very unreliable. Spend the extra dollar or so to save your $20 radio.

Re: NMEA from LS20031 error#150453

By paithew - Wed Oct 10, 2012 6:22 pm

- Wed Oct 10, 2012 6:22 pm #150453

Thank you very much.
Now I can fixed this problem already.
It is about api mode in xbee. If we use simple mode, it is nothing about problem. But In api mode, it should be nothing about problem. When I will use this mode, I think that I must fix my circuit that you recommend.
Thank you fll-freak and Joeisi.

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