[Open_electroporator] pyflex_f401 v0.6 prototype turn on

John Griessen john at cibolo.com
Fri Jul 13 17:23:55 UTC 2018


Started out without USB working.  Thought about what I'd done recently to change the board.

That included soldering on flat flex connectors, plugging and unplugging connectors, measuring
volts at points on the SWD connector...

Thought about making the second assembly since this one had worked
mostly -- then I'd have one to compare...

Looked around with binocular lenses and a microscope eyepiece zoom in.

USB connector looked iffy soldering -- on the USB connector that had tilted when going in and
the finger contacts to solder were raised up some.  Remelted those, looked again.  Close to shorting out,
so sharpened an exacto knife and scraped between fingers.

USB showing again when doing a lsusb on the host laptop connected to the pyflex_f401.

and the USB virtual filesystem comes up and all OK again.



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