I’ve got an Adafruit GPS module and it stopped working on Monday (the “Fix Led” doesn’t come on when power is connected). The GPS unit was working fine, in my Car connected direct to the Raspberry Pi 3 v3 pin. I noticed the unit had stopped working when I removed the Pi and GPS unit from my car and took it inside to be powered up via USB connected to my Laptop. The Fix light flashed as normal and then went dead. I thought it may have been the cables, which I’ve switched and the result if still the same. Typcially when I bring the unit inside, the LED flashes continually while it tries to get a fix.
Are you able to suggest anyway of telling if the GPS unit is still alive?
Are any lights illuminated on the board? What happens when you power it up outdoors in its original condition? It sounds like the problem was caused by removing it from the setup in your car. Can you include a photo of how it is wired up to the computer in the house?
It looks like the problem is the power supply to your Pi. The power light on the Pi should be solid red all the time. Flashing indicates a bad power supply, or too little power. The Pi needs at least 1.2A to run properly, not counting external devices it’s powering. A typical USB port will provide 500mah only. Try powering it with a 2A or greater 5V power supply and see how it works!
This could explain why it worked in the car and not on the bench.
I’ve switched out the power supply and now there is a constant red light, but the GPS module isn’t firing up. I also tried connecting the GPS to a direct 5v power supply but there was still no “fix light” flashing.
Do you know if there is anyway, other than seeing the fix light flash of confirming the GPS is working?
I’ve had it running previously on /dev/serial0 and I could see the output using “sudo cat /dev/serial0” but there’s nothing coming through atm.
Have you tested something that ‘does’ work with a valid UART signal to ensure the script is working?
If you don’t have anything else, then you could use a digital multimeter (configured for voltage measurement). Connect it between the GPS TX and Ground - if it reads anything other than a very constant 3.3V then it is likely data is being sent. If your DMM has frequency measurement, you could also monitor it that way.
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