RTK postcard product variant unknown

GPS/GNSS
1

Board ADC ID (mV): 2541

Identified variant: Unknown

Device MAC: 64B708941BCE

my postcard was working now wont boot getting product variant unknown, was working fine was charging reset it and this happened

2

I noticed letting the device sit for a bit made it come alive briefly. I’m thinking my esp chip may be faulty.

3

I did a factory settings reset from terminal and disabled extra nmea messages. I will test today to see if running a while causes it to crash. My only wonder is does basecast if no SD card is inserted fill-up the system file somehow?

4

If Basecast is designed to store logs internally when no SD card is inserted, it can fill up system storage over time, leading to instability or crashes.
If the storage fills up completely, the device may fail to boot correctly or experience erratic behaviour.

5

Makes total sense why it happened. I have added an SD card after doing factory clearing. Seems like a setting should disable writing to internal storage. Might be why my base wasn’t working too. I’ll have to try again.

6

I seemed to notice leaving it plugged in to charge it will crash and the reboot and hang. I think the chip is thermalling out after a certain amount of time.:frowning:

7

The Charger IC has built-in thermal regulation.
But that’s not to say the ESP32 isn’t getting too hot inside a tiny enclosure.
I haven’t checked the source code, but you might be able to catch the Reset Reason over serial ?

8

Hi Ryan (@AORPLS ),

The “Board ADC ID (mV): 2541 Identified variant: Unknown” failure is caused by this piece of code. It has nothing to do with the file system filling up.

It’s unlikely to be the 3.3K and 10K ID resistors as they are 1% parts. It is almost certainly the calibration on the ESP32’s ADC. It’s rare, but on some parts the ADC millivolt values can be off. It should be reading 2481mV, but, in your case, is reading 2541mV.

A return is probably going to be the best solution for you. It is possible to fix this in hardware or software, but neither is easy.

Apologies for the hassle,
Paul

2 Likes
9

I’m glad I’m not just going crazy then :slight_smile: I was like my first one works really well and this one seems buggy. I guess it’s good I got a soldering pump coming since I will need to desolder it from the portability shield. I have sent an email to sales so I will reference this thread if there is a question.

10

Thanks for reporting! Issue is here. We should have a fix in place shortly.