On 05/22/2016 02:02 AM, Eric S. Raymond wrote
The thing of possible GPSD interest we learned is that the SKU 424254,
that no-name GPS HAT from China, has a serious flaw. The trace that
should deliver 1PPS from the u-blox module to GPIO05 is *absent*.
This is not a simple manufacturing error; we were able to find a link
to its schematics and the trace is missing there, too. Which is
*weird* because the vendor page advertises that export heavily.
After some scope work that would have been utterly beyond my
competence (though I am learning) Phil was able to blue-wire the board
to do the right thing. I will document this in the Microserver HOWTO
and send the vendor a nastygram that leaves them no excuse not to fix
it.
Does anyone know if this is a product produced somewhere else too? I
also looked at the schematic referenced from the dx.com site and was
stymied by the lack of a connection to the header. Even though it
clearly stated that is was hooked up. I have ordered through DX many
times, typically expecting that most of the stuff is poor clones or
counterfeits of someone Else's design. Certainly a cause of frustration
if one isn't aware of it.
I forgot to look and see if there was a post in the user forums about
this issue. Many times it helps to get attention and let others know
there of problems like these.
Mike
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