Darren Gibbs | 1 Jun 01:05 2004
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Re: [PIC:] ICD2 and HS-PLL mode

Thanks for the suggestions!

It looks like I made a "software guy" error in thinking I could replace
a 20Mhz crystal with a 10MHz and not change the caps.  The guy that did
the board design had 18pf caps and it would appear that the 10MHz
crystal won't work with them.

On May 29, 2004, at 10:33 AM, Dave Dilatush wrote:
> Second, I'm not absolutely sure (I may be thinking of the old,
> original ICD, not the ICD2) but I think there's a limit on how
> high a target clock speed the ICD2 can accomodate in debug mode,
> somewhere around 25 MHz or so.

That would suck.. I couldn't find anything in the docs to that effect
but you never know.  I reckon I'll find out when I get the crystal
working.

thanks,

darren

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Bill Couture | 1 Jun 02:11 2004
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Re: [pic]:6 pin PICs!

On Mon, 31 May 2004, Mike Harrison wrote:

> I just hope they include a proper low-power BOD this time -  having to
> use the reset pin would wipe out 25% of the IO pins..!

Looking at the programming info, there is no BOD at all in the config
bits.

Bill

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Russell McMahon | 1 Jun 01:54 2004
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Re: [EE:] USB to microcontroller - project proposal

> >> What I'm proposing is HOST mode capability and USB2 speed.
> >>
> Bah.  Most microcontrollers need "USB2 speed" like they need XVGA
> displays (ie, NOT.)  Pick what you really think you need as a top speed
> and aim at that, instead of the max supported by the controller.

I want "as fast as one can reasonably do" :-) - a major application for me
is camera card data transfer. The faster the better. The Phillips ICs I
mentioned would be a good start

        RM

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Russell McMahon | 1 Jun 02:04 2004
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Re: [EE:] USB to microcontroller - project proposal

Brent Brown points out this useful site:

        http://www.usbdeveloper.com/index.htm

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Neville Paintin | 1 Jun 02:38 2004
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[PIC:] Picall

Anyone know where I can get a firmware chip for the Picall programmer? I've been in contact with Bojan and he
can supply one for $US12.00 CASH, but since I live in New Zealand that makes it a bit difficult.

     
     Regards Neville...

Check out my Home Page At http://homepages.ihug.co.nz/~Spaintin/

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Greg Miller | 1 Jun 03:53 2004
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[EE]: Building a 40' parallel cable.

        Are there any tips/tricks to building a 40' parallel cable.
We (the Louisville Astronomical Society) have a CCD imager with a
parallel cable interface, and we'd like to run all of the cables back
to the office space in our observatory.  Any noise leaking in would be
a painful issue.  We'll be running the cable through about a 1"
conduit in the floor.  Any advice on type of wire, gauge, shielding?
TIA.

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David VanHorn | 1 Jun 04:12 2004
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Re: [EE]: Building a 40' parallel cable.

At 09:53 PM 5/31/2004 -0400, Greg Miller wrote:

>        Are there any tips/tricks to building a 40' parallel cable.
>We (the Louisville Astronomical Society) have a CCD imager with a
>parallel cable interface, and we'd like to run all of the cables back
>to the office space in our observatory.  Any noise leaking in would be
>a painful issue.  We'll be running the cable through about a 1"
>conduit in the floor.  Any advice on type of wire, gauge, shielding?
>TIA.

Can you put a cheap computer near the camera, and LAN it back in?

"long" and "parallel cable" don't really go together, especially when you add "low noise" and "inexpensive".

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David Duffy | 1 Jun 04:34 2004
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[BUY:] MC145027P chips *Australia*

I want to buy a tube or two of MC145027 within Australia.
Some are on the way from USA but I need some before then.
David...

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Mike Hord | 1 Jun 04:51 2004
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Re: [PIC:] ADC source impedence

>If you care about data backup then it would be advisable to have a
>secondary
>power source that never powers the main circuitry but provides backup
>power.
>Can be very small and may even be "sealed for life" as far as user is
>concerned.

Interesting...like a hard-soldered lithium battery?

That could be an interesting thought.  Data backup isn't crucial, though.
I can afford to lose a little bit.

I think I am going to have to put in some kind of voltage follower, since I
really should check the battery voltage during the flash write cycle.  The
power draw peaks up near 35 mA during that...

Thanks for the ideas!

Mike H.

_________________________________________________________________
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John J. McDonough | 1 Jun 04:59 2004
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Re: [EE]: Building a 40' parallel cable.

----- Original Message -----
From: "David VanHorn" <dvanhorn@...>
Subject: Re: [EE]: Building a 40' parallel cable.

> "long" and "parallel cable" don't really go together, especially when you
add "low noise" and "inexpensive".

Well, not too bad if you keep it at DC kinds of frequencies.  Really, the
computer/LAN idea is a good one.  Another possibility is computer/WAP,
although 40 feet of CAT5 really isn't a big deal.  But the wireless is
probably cheaper if you have to pay someone to run the conduit.

If this is parallel at the sorts of rates that parallel printer cables use,
40 feet is pretty unrealistic.  Noise pickup will be a big deal, and while
shielding can do some good, on longer lines it's not going to be perfect.
Capacitance is probably an even bigger deal.  Low capacitance,
multiconductor, shielded, plenum cable is breathtakingly expensive, and not
a guarantee of performance.  The computer/LAN is likely to be cheaper,
simpler, and a whole lot more reliable.

--McD

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Gmane