GPS issue #80
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Hello everyone, I have a PyCubed Mainboard v5 and I recently install the GPS module. In particular, the module is a Ublox NEO 7M as you can see in the following figure.
When the board is turned on, it goes into safe mode due to low voltage on the microcontroller. The problem occurs when powering the board both with the power supply and with the battery board. The following figure shows the error displayed on the terminal.
Do you know what could be the problem? Waiting for your kind reply, thank you. Regards, Giacomo |
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Replies: 1 comment 3 replies
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I'd check for shorts here: It seems like some amount of code runs before you reach safe mode. Might it be occurring when you try to power the gps (by toggling the gps_en pin)? If there isn't a short, this particular gps module may be drawing enough inrush current to make the 3V3 rail dip. You could scope this to know for sure, then try adding a lot of parallel cap b/t 3V3 and GND somewhere near Q22. Good luck! P.S. make sure you have an antenna attached when powering the gps |
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Hi Max, thank you for your reply. We checked for the possible presence of a short in that point, but there is not. After we put a big capacitor between 3.3V and GND, the problem seems to be partially solved.
The problem seems to be in the code (such as some setting), but we can't figure out where the problem is. The line 22 of GPS_code.py is Could you help us? Giacomo |
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Glad you got it resolved! That error just seems to be related to the adafruit_gps library, which you'll have to troubleshoot manually based on how your particular module outputs data. I'd suggest starting simple: forego the library and just manually read the UART bus |
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Hi Max, after several tests carried out following your advice and without obtaining positive results, we decided to replace the GPS module with a different model. Now everything works, so the problem was probably in the module itself. Regards, Giacomo |
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I'd check for shorts here:
It seems like some amount of code runs before you reach safe mode. Might it be occurring when you try to power the gps (by toggling the gps_en pin)?
If there isn't a short, this particular gps module may be drawing enough inrush current to make the 3V3 rail dip. You could scope this to know for sure, then try adding a lot of parallel cap b/t 3V3 and GND somewhere near Q22.
Good luck!
Max
P.S. make sure you have an antenna attached when powering the gps