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'Blow only once with not PIC16C84? Is it true?'
1998\06\25@151931 by Hearn

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Dear all,

I just want to check whether it is true that the PIC models that can
deal with analogue ports can only be blown once.
I am doing a project at school that involves making a robot that can follow
a white line made of masking tape (MicroMouse by the IEE) and I was
wondering what sort of motor we should use. We have a choice between DC and
stepper motors but it seems to us that the 16C84 (the chip we use at the
moment) cannot deal with analogue signals. Is this true and what other
chips can do this? Also, is it true that the chips that can do this are
blow once? I just wanted to clear up a few inconsistencies.

Anyone know about this? Anyone? At all?

Michael

1998\06\25@161657 by Steven Kosmerchock

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Micheal,
There are some truths to what you have said. The 16C84 as far as I know can only
handle TTL or Schmitt Trigger inputs. Their are many great other PICs that can
handle Analog inputs. Check out the 16C6X and the 16C7X series. You might find w
hat you are looking for. As for being OTP, they are ; unless you buy the "JW" pa
ckage which can be erased by UV light. If you go this route I suggest buying 3-5
of them so you can prototype faster. A cheap (but good)  UV eraser can be bough
t from Digi-Key for around $50 dollars (US). Hope this little bit of info helps.
Keep up the education, it will pay off BIG time in the end!!

               Best regards,
               Steven

*****************************************************
Steven Kosmerchock
Engineering Technician
CELWAVE
Phoenix    Arizona    USA
email:  spam_OUTsteve.kosmerchockTakeThisOuTspamcelwave.com
******************************************************
www.geocities.com/researchtriangle/lab/6584
******************************************************






---- PICLIST(a)MITVMA.MIT.EDU's Message ----

Dear all,

I just want to check whether it is true that the PIC models that can
deal with analogue ports can only be blown once.
I am doing a project at school that involves making a robot that can follow
a white line made of masking tape (MicroMouse by the IEE) and I was
wondering what sort of motor we should use. We have a choice between DC and
stepper motors but it seems to us that the 16C84 (the chip we use at the
moment) cannot deal with analogue signals. Is this true and what other
chips can do this? Also, is it true that the chips that can do this are
blow once? I just wanted to clear up a few inconsistencies.

Anyone know about this? Anyone? At all?

Michael

1998\06\25@163746 by Timothy D. Gray

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Hmm, from what I remember that if you blow a chip (I.E. let the smoke out
of it) they dont work anymore. if you want an analog signal use an A/D
converter.

On Tue, 23 Jun 1998, Michael Hearn wrote:

{Quote hidden}

1998\06\25@170406 by Bob Blick

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Stepper motors are awful. Heavy and power-hungry. Use DC motors in your
robot.

The 16C84 has no A/D or D/A. The "7" series has A/D but no D/A. The parts
are available in windowed versions eraseable with a UV eraser. In a simple
robot you should not need A/D, stick with your 16C84 for the students...

my 2 cents :-)

-Bob

1998\06\26@041510 by Frank Tamminga

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Michael Hearn wrote:

> I just want to check whether it is true that the PIC models that can
> deal with analogue ports can only be blown once.
> I am doing a project at school that involves making a robot that can
follow
> a white line made of masking tape (MicroMouse by the IEE) and I was
> wondering what sort of motor we should use. We have a choice between DC
and
> stepper motors but it seems to us that the 16C84 (the chip we use at the
> moment) cannot deal with analogue signals. Is this true and what other
> chips can do this? Also, is it true that the chips that can do this are
> blow once? I just wanted to clear up a few inconsistencies.

The PIC16C84 or F84 are the only PIC's with EEPROM program memory. (BTW:
Microchip announced more)
The PICx8x family has no AD circuitry on board. However you can easily
create an AD convertor with a resistor and a capacitor. This is explained
in AN552.

Otherwise, use a member of the PIC16C7x family. They have an AD converter
on-board, but are OTP (one time programmable. For testing and development
in this case; use a windowed version witch is UV erasable.

Success

1998\06\26@071324 by Caisson

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> Van: Michael Hearn <.....michael.hearnKILLspamspam@spam@FALLIBROOME.CHESHIRE.SCH.UK>> > Aan: PICLISTspamKILLspamMITVMA.MIT.EDU
> Onderwerp: Blow only once with not PIC16C84? Is it true?
> Datum: dinsdag 23 juni 1998 15:58
>
> Dear all,
>
> I just want to check whether it is true that the PIC models that can
> deal with analogue ports can only be blown once.
> I am doing a project at school that involves making a robot that can
follow
> a white line made of masking tape (MicroMouse by the IEE) and I was
> wondering what sort of motor we should use. We have a choice between DC
and
> stepper motors but it seems to us that the 16C84 (the chip we use at the
> moment) cannot deal with analogue signals. Is this true and what other
> chips can do this? Also, is it true that the chips that can do this are
> blow once? I just wanted to clear up a few inconsistencies.
>
> Anyone know about this? Anyone? At all?
>
> Michael

Hello Michael,

 The PIC16x84 is one of the few EEPROM -devices (AKA can erased by
electricity).  Most others are EPROM devices (AKA  must be erased with
ultra-violet light).  Because of the fact that most casings are closed
(don't permit any light on the chip) they are called OTP's (One Time
Programmables).  If you blow a fuse there it does not matter, because you
can't erase them anyway. Ok, there are windowed versions of some OTP's, but
the construction _STAYS THE SAME_. This means that if you blow a fuse in a
windowed version you can erase the thing, but you _can't_ reprogram it.
The 16x84 is made to be erased & re-used time & time again.  It's
code-protect -bit can be erased (together with the rest of the PIC that is
:-)

Greetz,
 Rudy Wieser

1998\06\26@154000 by Mike Keitz

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On Fri, 26 Jun 1998 10:11:08 +0200 Frank Tamminga <.....p.f.tammingaKILLspamspam.....HGT.NL>
writes:
>Michael Hearn wrote:
>
>> I just want to check whether it is true that the PIC models that can
>> deal with analogue ports can only be blown once.
>> I am doing a project at school that involves making a robot that can
>follow
>> a white line made of masking tape (MicroMouse by the IEE) and I was
>> wondering what sort of motor we should use.

As one of the designers of a winning line-follower IEEE project car, I
could go on for quite a while about this.  Here's just a couple of major
comments.

If at all possible, don't build your own car.  Try to find a R-C model
car that meets the contest rules.  You want a conventional design with
two rear wheels driven by a DC motor through a differential, and one or
two steerable front wheels.  A suspension system helps a lot as you get
to higher speeds.

A good line following robot need not, in fact almost should not, have a
processor in the loop.  Analog circuitry works just as well and is much
easier to "tweak" for best control by installing variable resistors and
socketed capacitors where needed.  I would probably include one in the
next car I build to simplify a few parts of it, but that's because I'm
already familair with both line-following robots and PIC processors.  If
you're just getting started, stick to op-amps.


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