Hola Amigos, I'm having issues with my uBlox GPS. I've taken a lot of time reading the instructions and reading other's posts regarding their problems before deciding to post here.
First off, I built an adapter cable to be able to test the GPS via u-center and the FTDI cable. The GPS works properly when directly connected to my computer (u-center is really nifty, btw). I updated the firmware to latest version and have configured the GPS to communicated at 38,400 baud and followed the other instructions that Jordi describes elsewhere on the forum (http://diydrones.com/profiles/blogs/wiring-up-ublox-only-for-pros ). I cannot get a GPS lock when I connect it to the Ardupilot shield (blue version) nor to the ATMega328 board. I've been connecting the GPS via the uBlox adapter (from diydrones) and the uBlox adapter cable.
Other than the GPS not connecting, the rest of the autopilot seems to work properly (fbw, etc). Oh, I've tried several versions of the ardupilot code to see if that's the problem. It doesn't seem to be.
After looking at the instructions and reviewing the adapter, I have a couple of questions.
The manual shows a 3.3V connector for GPS/Modem ( http://ardupilot.googlecode.com/svn/images/twentytwo.jpg ). Should the GPS also be connected to Ardupilot Shield from this connection? I've tried this using the pins I added to the bottom of the adapter to make a connection and it still doesn't work. I'm assuming the uBlox adapter cable was meant to bypass the need for connecting to the 3.3V GPS/Modem pins but just double checking.
On the back of the uBlox Adapter board there is selector for >5V and 3.3V ( http://store.diydrones.com/v/vspfiles/photos/BR-0008-01-4.jpg ). It looks to me like the default selection is >5V (middle pin and the one closest to >5V are soldered). Is this correct if the GPS is to be running at 3.3V?
Any suggestions on how to proceed? I'm perplexed and hoping there is something obvious I'm missing.
p.s. I'm trying to get GPS lock with a clear line of sight to the sky and I've tried the GPS test utilities (Raw_GPS_Tester and uBlox_Tester).