Hello, I have been having issues with getting some GPS hats to get a fix.

I have successfully soldered some Audiomoths and GPS hats together, and they have been able to get a GPS fix from inside a lab room inside a building, far away from doors and windows. However, two other Audiomoth/GPS hat units have not been able to get a fix from the same location, even if close to doors and windows. I have been using a SETTINGS.TXT file that the functional units have been able to get a fix with. I can provide the file if it would be helpful to see it.

Both Audiomoths function properly with Audiomoth-Firmware-Basic and can record files using a configuration from the Config App that does not use the GPS hat. When I soldered the functioning Audiomoth/GPS hat units together, I used a multimeter to measure their resistances and connections, and the resistances of the two units that currently are not working match those of the functioning ones, so I am pretty sure this is not a connection issue.

Additionally, both GPS hats were soldered and then unsoldered from their original Audiomoths, and they seem to have very similar issues. One of them was resoldered to its original Audiomoth (known as Audiomoth L) to try to resolve the lack of GPS fix, while the other was soldered to the wires, as shown in the image at the bottom, to see if it would get a fix while connected to a different Audiomoth (known as Audiomoth G) via a breadboard.

Audiomoth L was not able to get a GPS fix both the first and second time that the hat was soldered onto it. I checked and made sure that each soldered pad on the Audiomoth was connected to the corresponding area on the hat (+ to +, a7 to a7, etc) and no connection issues were found. I tried taking it to a parking lot to see if an open space would help, but it was still not able to get a fix.

While testing the setup with Audiomoth G and the breadboard, I tested the resistances and connections using a multimeter and they all came back normal. I also checked and made sure that each soldered pad on the Audiomoth was connected to its corresponding area on the hat (+ to +, a7 to a7, etc) and no connection issues were found. The LED on the hat would light up for a couple seconds and then stop, and the LEDs on the Audiomoth would move between solid green + 1 red flash/sec and solid green + 2 red flash/sec. When I repeated the setup with a new previously unused GPS hat, Audiomoth G was able to get a fix and start recording.

Please let me know if you would like to see any other images or files, or if you would like any other clarifying details.

Thank you!

Ameena Majeed