I got a ublox 5 GPS unit the other week and I’ve been trying to get it work for days, but to no avail.
I was wondering if anyone could give me some tips or advice on what I am doing wrong.
I am using the Sparkfun breakout (GS407) to connect the u-blox to a FTDI cable (Thanks MarkH). and powering it with clean 3.3v.
I used the u-center software to connect to the device. I get the following messages from the GPS unit (all the time):
But this is all I get.
These are the things I have tried:
[ulist]
Flashed the module with the latest firmware
Powered the 3.3v from a Fez Panda
Powered the 3.3v from a 3.3v voltage regulator
Added all the filtering capacitors they suggested
Reset the module back to default settings
Stood outside with it for 20 mins (clear sky)
[/ulist]
I have heard that the module requires a good clean 3.3v, so I tried all the options I could. I noticed a voltage drop of 3.1v across the module when it is running, even though I supplied it with 3.3v - Not sure if this helps.
I haven’t powered it with anything but 3.3v, so I’m quite certain I haven’t fried it.
Any suggestions would be really appreciated. Thanks.
If you’re getting voltage drop, it could be there isn’t enough power coming out of the regulator. Do you have a regulated lab supply, or an old PC power supply you can take 3.3v from? 3.3v from the panda should be more than enough though =\ The IC package they have on there should handle 750mA or so and this will only use 75ma…
Make sure all your grounds are connected to a single point.
I haven’t looked at the datasheet for awhile, but perhaps try to send it a config sentence (change the update rate or sentences that get sent).
Hook VBatt directly to your 3.3v supply, dont worry about the coin cell.
The format of the NMEA sentences seems correct and the checksum is fine. But what is the ??.??.?? in front of them?
[edit] I see that the ??.??.?? is some sort of timestamps from the software, I’m used to just looking at it in a serial terminal
As Mike said, take outside and check the antenna connection. Everything else seems fine. From a cold start it can probably take several minutes to get a fix.