Tuesday, December 26, 2017

Strangely unsuccessful PCB fabrication

Given that my next step was to build a new board and hope the flakey gremlins went away, I put myself to work.

I used some solder paste and a reflow hot air gun that a friend had very kindly lent me, and it simplified the work quite a bit.

I got to the point where the I2C mux and the temperature sensor on the board were working just fine, and I had a socket soldered down for a Fio V3.

I then soldered on some IC sockets for the pressure sensors. And all of a sudden, that by itself caused my board to stop functioning.

I'm not sure what went wrong but it seems that the Fio V3 freezes when writing to the I2C mux somewhere. I scoped the signals and don't have an immediate diagnosis. But it's very frustrating that I can't seem to put together a board without high drama. :(

These are pictures of both sides of the board as it is. As you can see, the 4-pin IC sockets are pretty far away from anything, so I remain puzzled as to what evils soldering them on could possibly have wrought.

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