bigger can...) here's a follow-up... is it feasible to do the link
via a wireless connection (a la TLP434/RLP434 used to do a wireless
serial)?
I ask since "Otto" may grow too big for his chassis, and adding
an 'auxiliary body' rather than a separate bot might be an option.
Kind of like a dual-body with a single mind? Or have I lost mine?
I have so many sensors I'd like to utilize, and sticking with an
Oopic (rather than getting PICs) would aid this one-man madness
machine. I'm getting somewhat comfortable with my Oopics - gotta luv
a lazy guy!
If I'm way off base just say so, and I'll scale back my rule-the-
world ambitions... maybe. ;)
--- In oopic@yahoogroups.com, ooPIC Tech Support <dennis.clark@...>
wrote:
>
> I don't have an OOBoard - Does anyone out there use an OOBoard and
> oDDELink? This would be a GREAT test.
>
> DLC
>
> dan michaels wrote:
> > --- In oopic@yahoogroups.com, ooPIC Tech Support <dennis.clark@>
> > wrote:
> >
> >>One other thing - The problem does not exist when using ooPIC II+
> >
> > chips,
> >
> >>ooPIC II or any other ooPIC version on ooPIC S boards. It ONLY
> >
> > happens
> >
> >>when using an ooPIC R or ooPIC C, which use the QFP packages, and
> >
> > are
> >
> >>16F877a chips.
> >>
> >>DLC
> >>
> >
> >
> >
> > Well, that is interesting. I think the OOBoard also uses the smt
> > parts. Do you know if it also has the problem?
> >
> >
> >
> >
> >
> >>dan michaels wrote:
> >>
> >>>--- In oopic@yahoogroups.com, ooPIC Tech Support <dennis.clark@>
> >>>wrote:
> >>>
> >>>
> >>>>I've played with this problem for off and on for a while it
seems
> >>>
> >>>and
> >>>
> >>>
> >>>>can't find any good explanation or reasoning. You should be
> >
> > using
> >
> >>>2.7K
> >>>
> >>>
> >>>>to 4.7K for even short distances (measured in single digit
> >>>
> >>>centimeters)
> >>>
> >>>
> >>>>but it simply won't work between any two ooPICs that use the
> >>>
> >>>16F877a
> >>>
> >>>
> >>>>processor and I just don't understand why.
> >>>
> >>>
> >>>
> >>>
> >>>I've never played with DDE, but this large resistor value
> >
> > business
> >
> >>>makes no sense, as the 877(A) pins can all source and sink
> >
> > upwards to
> >
> >>>20-mA. 5v/20mA = 250 ohms!
> >>>
> >>>I wonder if there isn't some problem with the code on the newer
> >>>firmware not switching modes properly between output and input,
> >
> > ie
> >
> >>>some timing issue, when the data transfers switch direction.
> >>>
> >>>JFTHOI, you might try putting a small series R in the leads
> >
> > between
> >
> >>>the 2 OOPic 2+ chips and see if that helps. Just a shot in the
> >
> > dark.
> >
> >>>
> >>>
> >>>
> >>>Putting an ooPIC S board in
> >>>
> >>>
> >>>>the circuit fixes it, so that left out cable length, noise in
the
> >>>
> >>>wires
> >>>
> >>>
> >>>>or just bad connectors. If anyone can figure out why this
> >
> > happens
> >
> >>>I
> >>>
> >>>
> >>>>offer up a 4 pack of Guiness Draught cans as a prize!
> >>>>
> >>>>DLC
> >>>>
> >>>>rtstofer wrote:
> >>>>
> >>>>
> >>>>>--- In oopic@yahoogroups.com, ooPIC Tech Support
<dennis.clark@>
> >>>
> >>>wrote:
> >>>
> >>>
> >>>>>>The most certain way to make sure that the DDE link works is
to
> >>>
> >>>have an
> >>>
> >>>
> >>>>>>ooPIC S in the loop. Otherwise the high value data and clock
> >>>
> >>>resistors
> >>>
> >>>
> >>>>>>need to be used. No one can explain this oddity, but it has
> >>>
> >>>something
> >>>
> >>>
> >>>>>>to do with the PIC 16F877a part.
> >>>>>>
> >>>>>>DLC
> >>>>>
> >>>>>
> >>>>>If you have to use 22k to 33k resistors, the cable length
> >
> > between
> >
> >>>the
> >>>
> >>>
> >>>>>OOPics will have to be measured in small numbers of inches.
> >
> > That
> >
> >>>much
> >>>
> >>>
> >>>>>resistance just won't overcome any kind of capacitance.
> >>>>>
> >>>>>A conventional I2C network would have resistors in the 2.2k
> >
> > range.
> >
> >>>>>Unfortunately, I only have a couple of S boards so I can't
> >
> > really
> >
> >>>test
> >>>
> >>>
> >>>>>the bug to see what is happening.
> >>>>>
> >>>>>Richard
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>Yahoo! Groups Links
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>--
> >>>>------------------------------------------------------
> >>>>Dennis Clark ooPIC Tech Support
> >>>>www.oopic.com
> >>>>------------------------------------------------------
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>
> >>--
> >>------------------------------------------------------
> >>Dennis Clark ooPIC Tech Support
> >>www.oopic.com
> >>------------------------------------------------------
> >>
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
>
> --
> ------------------------------------------------------
> Dennis Clark ooPIC Tech Support
> www.oopic.com
> ------------------------------------------------------
>
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