On 28 September 2016 at 20:57, Gene Heskett <ghesk...@shentel.net> wrote:

> So how to satisfy this vfd?  Needs a positive speed pwm, and a positive
> for run fwd, and a positive for run reverse, presumably mutually
> exclusive.
>

VFDs norrnally need their inputs pulled down to their own digital GND.
(Have you tied BoB GND to VFD GND?)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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