In picture 1 the GPS is connected to the USB client DP module, which supplies the GPS with a 3.3 voltage. The RX and TX on the GPS is connected to a USB to Serial interface which is connected to my computer by USB. I’m using Realterm to recieve information from the GPS. The setup in picture 1 works great, I get a lock almost immediatly and the position data is accurate.
In Picture 2 Instead of getting supply voltage and ground directly from the USB client DP module, I get it indirectly through the FEZ Spider motherboard. I checked the supply voltage over the GPS and current draw and its identical to the setup in picture 1. I would have expected this to work, but it does not. I recieve data from the GPS and I can send commands to it without a problem, but the GPS is not able to find any satellites.
Picture 3 shows how I want the setup to be in the end minus the two lose wires on the GPS-module. But as of now that setup is not working, the GPS is not able to find any satellites.
I’ve been trying for a few days now to get this working, but I’m completely stuck. Is there anyone in here that has any idea what might be happening?
Picture 1: http://i.imgur.com/3lIDitP.jpg Works great!
Picture 2: http://i.imgur.com/IaxfjHO.jpg Does not work, does not find satellites.
Picture 3: http://i.imgur.com/5qNAvg2.jpg Does not work, does not find satellites.
I should also add that no program is loaded into the FEZ Spider. Only thing I’m trying to do is to have the GPS find satellites and get position data while connected to the FEZ Spider.