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PICList Thread
'your mail'
1994\08\31@190804 by crocontroller discussion list

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face
>
> Does anyone have any experience implementing digital
> filters, specifically low pass filters,  on the lower end PICs,
> e.g. the 16C71?
>
One way to do it is inc or dec your variable every time you check your
input instead of passing the full input value. Variations on this theme
is the basis of DSP. Loop speed, adding some fraction of the difference
between input and output, etc. are all affect your cutoff. -Rick


'your mail'
1994\11\15@042453 by crocontroller discussion list
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face
>
> Please remove my name from the mailing list.
> spam_OUTjim.knoxTakeThisOuTspamum.cc.umich.edu       Thanks.
Me too. This list is far to productive. What about a news conference..?


--
Roger (Sysop RaumaMBBS #1 +47 712 54774 (300-21600+HST))
     (                #2 +47 712 56759 (300-9600 +HST))
PolarNet: Roger Storvik@RBS --- Internet Email: .....Roger.StorvikKILLspamspam@spam@hiMolde.no

1994\11\15@043108 by crocontroller discussion list

flavicon
face
Sorry to post here, but I can't seem to get off the list using
listserv.
Good interesting stuff, but my mailbox is bursting.
Please unsubcribe me
Thanks

seanlspamKILLspamharlequin.co.uk


'your mail'
1995\04\05@045829 by David Tait
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face
Hi,

> I want to say David Tate, but I'm not sure.

Very close - David Tait.

I'm not sure my stuff will be useful to you.  If you want to check,
Rafe Aldridge supplied me with a better schematic than my rough ASCII
version and this, plus Rafe's PCB patterns, is available in GIF form
as:

 ftp://ftp.ee.ualberta.ca/pub/cookbook/comp/ibm/pic84pcb.zip

The files pic84pgm.zip (original programmer stuff) and pic84faq.zip
(a help file) are also there.

David


'your mail'
1995\06\27@032318 by Brian Lane
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-----BEGIN PGP SIGNED MESSAGE-----

On Mon, 26 Jun 1995, Berard wrote:

> Within the last 6 months or so I've seen someone
> refer to a project that they were working on
> that is similar to the 'Jumping Water Fountains'
> found in EPCOT Center at Walt Disney World
> in Florida. I've gone through the archived
> log files (thanks Nick/Jory) but still can't find
> any reference to this project - maybe I saw it
> at someones WWW site?

 Hmm, this is one of my future projects, but I don't remember posting
anything to the list. Maybe you're just reading my mind!

>
> I'm going to try my hand at controlling such a setup
> with a PIC, but I would like to know what type
> of water pump works best for this type of 'pulsed'
> application.

 I saw a TV show about the company that does these cool entertainment
water projects. They did the EPCOT one, as well as several others. One is
a very short pulse of water between pads, so you get a droplet about the
size of a golfball.

 In the show they explained how they did their splashless water
fountain(single stream of water, entering destination pool with no
splash. Very cool looking!). They have a filter attached to the end of a
hose. Wat it does is straightens out the water direction, removing
turbulance.

 If I remember right it was a plexiglass cylinder with a normal garden
hose connection on one end, and it contained a couple of mesh screens and
a whole bunch of straws(drinking straw sized).

 I've always wanted to build a desktop version of this but I haven't
been able to locate a small, quiet pump to move the water. I've never
tried building a filter(but plan to One of These Days).

 I sure would like to hear from others interested in building something
like this. If there is enough interest and its not all pic related I can
start a mailing list for it here on my machine.

  Brian

- ---------------------------------------------------------------------------
      email .....blaneKILLspamspam.....guetech.com with 'Subject: blane-info' for PGP key

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1995\06\27@105238 by Brian Lane

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-----BEGIN PGP SIGNED MESSAGE-----

On Tue, 27 Jun 1995, Doug Sellner wrote:

> Using a pump for each fountain would be much to expensive, you should use
> solenoid valves and one pump to increase performance, decrease cost.

 Correct, but do you have and sources for solenoids that can easily be
interfaced to water? I have an aircraft fuel solenoid(I think) that I was
going to try, but I can't find any other parts to use with it.

 Does anyone have a source for various pumps, solenoids and tubing? I'd
like to work on this during my summer break. I have a couple of surplus
catalogs and I ordered a pump from one, but it doesn't put out a
continuous stream and is quite noisy.

 I would like to create a 'desktop' version of the hopping blobs for the
spare space in my living room.

  Brian

- ---------------------------------------------------------------------------
      email EraseMEblanespam_OUTspamTakeThisOuTguetech.com with 'Subject: blane-info' for PGP key

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'your mail'
1995\07\05@185353 by jpq
picon face
>
> I've been following the discussion on IR communications
> with some interest, and have a question about the protocol
> used in commercial remote control units.
>
>

I know of a vendor who claims he can build a board that understands
SONY TV/VCR type transmitter pairs.  I am trying to get him to
design a board for me that uses a pic to bring keypresses out to
an RS232 interface.  (sort of a TV remote demodulator).  Is there
any interest here for such a board?

- John

--
John Quintana                          Internet email: jpqspamspam_OUTnwu.edu
DND-CAT Synchrotron Research Center    Voice Phone: (708) 252-0223
APS/ANL Sector 5, Bldg. 400            FAX Phone: (708) 252-0226
9700 South Cass Avenue                 WWW: http://tomato.dnd.aps.anl.gov/~jpq/
Argonne, Illinois 60439

1995\07\06@223125 by First Last

flavicon
face
John Quintana writes:
JP>I know of a vendor who claims he can build a board that understands
JP>SONY TV/VCR type transmitter pairs.  I am trying to get him to
JP>design a board for me that uses a pic to bring keypresses out to
JP>an RS232 interface.  (sort of a TV remote demodulator).  Is there
JP>any interest here for such a board?

I have already done this unit using a one-for-all remote.
Should I package it as a kit and sell it?

Gary Skinner,  Electronic Solutions, Inc   Denver CO

PS - there is an article in the latest issue of electronics now that
does
part of this job in a weird way.

1995\07\07@014257 by John Quintana

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face
>
> John Quintana writes:
> JP>I know of a vendor who claims he can build a board that understands
> JP>SONY TV/VCR type transmitter pairs.  I am trying to get him to
> JP>design a board for me that uses a pic to bring keypresses out to
> JP>an RS232 interface.  (sort of a TV remote demodulator).  Is there
> JP>any interest here for such a board?
>
> I have already done this unit using a one-for-all remote.
> Should I package it as a kit and sell it?
>
> Gary Skinner,  Electronic Solutions, Inc   Denver CO
>

I have an application where I would be quite happy to purchase stuffed
PC boards.   Email me directly, I'll tell you the project, and see
what we can work out.  Right now, I just need a prototype to demonstrate
feasibility.

- John

--
John Quintana                          Internet email: @spam@jpqKILLspamspamnwu.edu
DND-CAT Synchrotron Research Center    Voice Phone: (708) 252-0223
APS/ANL Sector 5, Bldg. 400            FAX Phone: (708) 252-0226
9700 South Cass Avenue                 WWW: http://tomato.dnd.aps.anl.gov/~jpq/
Argonne, Illinois 60439


'your mail'
1995\10\04@223049 by Marc Laclair
picon face
-------------------------------------------------------------------------------
Marc Laclair                               __  __     ____  ___       ___ ____
KILLspamlaclairKILLspamspamprimenet.com                     /__)/__) / / / / /_  /\  / /_    /
http://www.primenet.com/~laclair/       /   / \  / / / / /__ /  \/ /___  /
-------------------------------------------------------------------------------

On Tue, 3 Oct 1995, Daniel Rocha wrote:

> Hello there,
>
> I am a new member.
>
> Does anybody know of a good, cheap software simulator (freeware or shareware
>  will do) for the PIC family.
>
> Daniel Rocha
>

Try anonymous ftp to 'ftp://ftp.ultranet.com/biz/mchip'
I think it is one of the last files in the dir.  sim????.zip

Marc LaClair


'your mail'
1995\11\27@110222 by Rick Miller
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face
On Sun, 26 Nov 1995 RemoveMEscottTakeThisOuTspamYOUNGGUN.DEMON.CO.UK wrote:

> can anyone point me to share/free ware windows pic 16c54 assembler
> software.also looking for a good simulator not dos.
> thanks scott.

Why don't you check out our work here at Project GNUPIC?

 <http://www.execpc.com/~digalog/.magic/address.html>

Rick Miller, Design Engineer  (and local "Internet Guy")
Digalog Systems, Inc.         <spamBeGonerickspamBeGonespamdigalogsys.com>
3180 S. 166th St.             <TakeThisOuTRick.MillerEraseMEspamspam_OUTLinux.org>
New Berlin, WI  53151  USA    +1 414 797 8000 x-228


'your mail'
1995\12\12@162002 by Ben L Wirz
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face
Yes, I have some PIC 16C84, 10 Mhz 18 Pin Dip, leftover from a recent
Bulk Buy.  See my WEB page (Address in Sig)  for more info or email if don't
have WEB access.  My price beats most standard suppliers by 25% at small
quanties.

Ben,

Ben Wirz                Check out My Home Page for Great Deals on Bulk
                       Buy Electronics (LMD 18200 H Bridge and PIC 16C84)
RemoveMEblw2spamTakeThisOuTcec.wustl.edu      http://cec.wustl.edu/~blw2/index.html

On Tue, 12 Dec 1995, gunnar.hvalEraseMEspam.....login.eunet.no wrote:

> Does someone have PIC16c84 chips??
>


'your mail'
1996\08\26@102907 by Ben L Wirz
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Vikram,

       This should help:


On Mon, 26 Aug 1996, Vikram BAJAJ wrote:

> Hi everyone,
>
> I am a complete beginer to Micro-controllers.
>
> 1. Can any one suggest which microcontroller would be the best to start
> with in PIC series and what tools would I need to use any where can I
> get them, if possible in shareware? Is there any book for beginner or
> any material available on the net?

       The overwhelming choice for a beginner PIC chip is the PIC16C84.
This is mainly because it features EEPROM memory which can be erased
without the use of a EPROM Eraser, a big advantage for a newbie.  All the
software and documentation can be found on the Microchip Web site at:
http://www.mchip.com.  A good book for beginners is Easy PIC'n.

       I have PIC16C84's available along with a easy to build and cheap
($15 US) PIC programmer available on my Web page at:
http://cec.wustl.edu/~blw2/index.html  I will also have the Easy PIC'n
books in available in a couple days.

Good Luck,

Ben

Ben Wirz                For Great Deals on Nitinol Wire, H-Bridge IC's,
Wirz Electronics        Polaroid Sonar Units, PIC 16C84's, and more
EraseMEblw2spamcec.wustl.edu      Hobbyist Robotic & Electronic Supplies, visit:
                       http://cec.wustl.edu/~blw2/index.html


'your mail'
1996\10\14@130805 by John Payson
flavicon
face
> Have any of you received a Warning [224] for the 16C84 when using a TRIS
> command??
> I have successfully assembled an file for the 16C54 w/ no warnings or
> errors, but if I
> change the assembler directives for a 16C84 the following warning is
> found whenever
> a TRIS is used.
>
> Warning[224]: Use of this instruction is not recommended.

Microchip does not recommend the use of the TRIS or option instructions
because of the possibility that future CPU's may not support such a thing.
I am aware of no actual plans to discontinue support for these instructions
and would hope that any future CPU's would allow setting the TRIS registers
without the annoying bank-switching that's required to do it the "right"
way [for example, it would probably be fairly easy to design a CPU so that
another page-zero address would decode to the upper I/O.  For example, if
the PIC16C84 were modified so that addresses $80-$8F were mapped to $70-$7F
(and maybe, in consequence, $F0-FF as well) then TRIS PORTB could be simply
assembled as "MOVWF $76".

Personally, I find "TRIS PORTB" to be much clearer and more reasonable than
"BSF RPO / MOVWF PORTB / BCF RP0" which is what is otherwise required.


'your mail'
1996\12\16@114708 by Byron A Jeff
face picon face
>
> I desire to know  if is possible to remove the code of protection from a
> contained program in a pic 16C57.

Please explain the justification of this desire? To a person on this list
we respect code protection. Why should we tell you how to break it?

BAJ


'your mail'
1997\06\26@060324 by Ian Raymond Douglas
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face
Hi Chao
 I am also very interested in robotics and acquired an excellent book on
it by Gordon McComb. It is titled "The robot builders bonanza. 99
inexpensive robotics projects".
 It is published by Tab Books, div of McGraw-Hill (1987) and is probably
a little bit dated but is full of useful and interesting circuits and
information. Hope this is of help.
   Regards,
          Ian Douglas

1997\06\26@170908 by tim.kerby

picon face
Hi
I got a copy about a year ago and havent found anything better.
Everything else is too full of formula and theory and give no practical
advice.  My only complaint is some parts are outdated and no longer
available (e.g. the speech synthesis stuff).

Tim

Ian Raymond Douglas wrote:
>
> Hi Chao
>   I am also very interested in robotics and acquired an excellent book on
> it by Gordon McComb. It is titled "The robot builders bonanza. 99
> inexpensive robotics projects".
>   It is published by Tab Books, div of McGraw-Hill (1987) and is probably
> a little bit dated but is full of useful and interesting circuits and
> information. Hope this is of help.
>     Regards,
>            Ian Douglas


'your mail'
1997\08\22@165221 by Shane Nelson
flavicon
face
Microchips "Embedded Control Handbook" has lots of application examples in
it. Helped me out alot. And if you can make it to one of there seminars I
found that very useful. Check out there webpage if you haven't
already. http://www.microchip.com.

-Shane.

On Fri, 22 Aug 1997, Andy Kunz wrote:

{Quote hidden}


'your mail'
1997\12\05@121301 by Dave Celsnak
flavicon
face
On Fri, 5 Dec 1997, stephen mcalonan wrote:

> Hello everyone!
> I am using the 5 channel A/D on the PIC16C73A running at 5V.  I am using
> an external voltage reference of 2.5V on pin RA3/AN3/Vref.  My question
> is: Should I use a zener diode, etc. to protect the port from voltages
> from 2.5V to Vdd+.6 or will this just give me a full scale reading?  Are
> there any other thought on protecting A/D inputs?  Thanks in advance.
> Steve McAlonan
I'm sorry, but all I can add to this one is more questions.  I am using
the '72 part with 5 channel A/D's also.  I have the Vref from Vdd (+5V).
I seem to have problems if I don't tie the unused channels to ground.  I
remember CMOS parts needing unused inputs tied to Vcc or Vdd.  Is this
true for ALL pins on the PIC (I believe I can clear unused I/O pins to
outputs, and forget about making sure they are grounded)?

Thank you,               6500
                             7000
Dave Celsnak                    ___7500
                              / /     8000     (Shift!)
                            /-/
                          / /              RPM
                        / /
                      / /

1997\12\05@154131 by stephen mcalonan

picon face
>> Hello everyone!
>> I am using the 5 channel A/D on the PIC16C73A running at 5V.  I am
using
>> an external voltage reference of 2.5V on pin RA3/AN3/Vref.  My
question
>> is: Should I use a zener diode, etc. to protect the port from
voltages
>> from 2.5V to Vdd+.6 or will this just give me a full scale reading?
Are
>> there any other thought on protecting A/D inputs?  Thanks in advance.
>> Steve McAlonan
> I'm sorry, but all I can add to this one is more questions.  I am
using
>the '72 part with 5 channel A/D's also.  I have the Vref from Vdd
(+5V).
>I seem to have problems if I don't tie the unused channels to ground.
I
>remember CMOS parts needing unused inputs tied to Vcc or Vdd.  Is this
>true for ALL pins on the PIC (I believe I can clear unused I/O pins to
>outputs, and forget about making sure they are grounded)?
>
>Thank you,               6500
>                              7000
>Dave Celsnak                    ___7500

Dave,

Setting all unused pins on your '72 to outputs prevents harmful
oscillations on those pins.  Besides increasing power consumption that
may be affecting your A/D readings.

-Steve

______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com


'your mail'
1998\01\27@061304 by John Payson
picon face
> Philip Cowley wrote:
>
> > I need to count the pulses coming from a pair
> > of quadrature incremental encoders.
>
> Are these optical encoders, or mechanical?
> The latter have _awful_ signals.

While I agree that mechanical encoders' signals leave something to be
desired, they need not cause too many problems.  The key is to interpret
the encoder as progressing through the states "1X X1 0X X0" rather than
the more conventional "11 01 00 10".  Since at least one of the two
contacts should be stable at any given time, the encoder will always be
stable in at least one of the four positions mentioned.

For some types of software implementation, this method will be equivalent
to adding one click worth of hysteresis to the processing logic.  The
interpretation of the signal as having those "X" states, however, will
allow for other implementations which would not be feasible otherwise.
For example, on a chip with two independently-programmable edge-detect
interrupts, the interrupts could be programmed so that each rotational
click would cause one interrupt [for example, if I'm looking for and see
a rising edge on the first input, I would check the state of the second
input and then disable the first input's interrupt-on-change while I
enabled the second's].

Mechanical encoders can be tricky to be sure, and the 4-bit ones may be
easier to get good results with than the 2-bit ones; still, the availa-
bility of many cheap mice that work decently proves that even junky 2
bit encoders can be made to work reliably.

1998\01\27@064912 by Philip Cowley

flavicon
face
>While I agree that mechanical encoders' signals leave something to be
>desired, they need not cause too many problems.  The key is to interpret
>the encoder as progressing through the states "1X X1 0X X0" rather than
>the more conventional "11 01 00 10".  Since at least one of the two
>contacts should be stable at any given time, the encoder will always be
>stable in at least one of the four positions mentioned.


I am actually using optical encoders...

See my reply in the PICLIST

Phil


'your mail'
1998\03\23@174705 by John Halleck
flavicon
face
part 0 2520 bytes content-type:TEXT/HTMLontent-Type: TEXT/HTML Content-ID: Content-Description:
LA PEQUENA JESSICA MYDEK TIENE SIETE AnOS DE EDAD Y SUFRE DE UN
>> > > AGUDO Y MUY RARO CASO DE CARCINOMA CEREBRAL. ESTA CONDICION
>> > > PROVOCA DIVERSOS TUMORES  MALIGNOS EN EL CEREBRO, SIENDO UNA
>> > > ENFERMEDAD TERMINAL.
>> > >
>> > > LOS DOCTORES LE HAN  PRONOSTICADO A JESSICA SEIS MESES DE VIDA Y
>> > > COMO PARTE DE SUS ULTIMOS DESEOS, ELLA QUISO INICIAR UNA CADENA
>> > > DE E-MAILS INFORMANDO DE SU CONDICION Y ENVIAR EL MENSAJE A LA
>> > > GENTE  PARA QUE :
>> > >
>> > > **** VIVA AL MAXIMO Y DISFRUTEN  DE CADA MOMENTO DE
>> > > SU VIDA  **** UNA  OPORTUNIDAD QUE  ELLA NUNCA TENDRA.
>> > > ADICIONALMENTE, LA SOCIEDAD AMERICANA DE LUCHA CONTRA
>> > > EL CANCER JUNTO CON OTRAS EMPRESAS SPONSOR ACORDARON DONAR TRES
>> > > CENTAVOS  QUE SERAN DESTINADOS A LA INVESTIGACION DEL CANCER POR
>> > > CADA PERSONA  QUE  ENVIE  ESTE  MENSAJE.
>> > > POR  FAVOR, DENLE A JESSICA Y A TODAS LAS VICTIMAS DEL CANCER
>> > > UN A OPORTUNIDAD.SI  EXISTIERA ALGUNA DUDA, ENVIE ESTE
>> > > E-MAIL A LA SOCIEDAD AMERICANA DE LUCHA CONTRA EL CANCER A
>> > > ACS@aol.com.
>> > >
>> > > Por cada persona a la que le envie este e-mail, la Sociedad
>> > > Americana de Lucha contra el Cancer donara tres centavos para la
>> > > investigacion.
>> > >
>> > > Solo haga lo siguiente:
>> > > Primero dirija este e-mail a ACS@aol.com y luego, en la parte
>> > > donde dice CC: agregue todos los amigos o colegas que pueda. Es
>> > > por una buena causa, no se limite solo a borrarlo.
>> > >
>> > > Gracias!!!!!!
>>
 


'your mail'
1998\06\22@205345 by Timothy D. Gray
flavicon
face
:0 Hf
* ^From: 3ds6rl&*
/dev/null

Here's a procmail recipie to block this guy's spam everyone. Procmail
filtering of email marketing works better!


On Tue, 23 Jun 1998, 3ds6rl wrote:

> Authenticated sender is <RemoveME3ds6rlEraseMEspamEraseMEatt.net>
> Subject:   **Bull's Eye Software
> Mime-Version: 1.0
> Content-Type: text/plain; charset="us-ascii"
> Content-Transfer-Encoding: 7bit
>
> EMAIL MARKETING WORKS!!
>
Remember only morons spam!
I wish I had gotten the spam directly so that I could have made a better
filter.


'your mail'
1998\07\15@231152 by Timothy D. Gray
flavicon
face
Someone please find out who this is and put an AXE through their computer
or just mount a degaussing coil on top of their hard drive....

On Thu, 16 Jul 1998, ____Bulll*sEye**_ wrote:

> Subject:  _-*Bull_s*Eye*Targeting*Software-
> Mime-Version: 1.0
> Content-Type: text/plain; charset="us-ascii"
> Content-Transfer-Encoding: 7bit
>
> EMAIL MARKETING WORKS!! Make enemies faster than any other technique!

1998\07\16@011059 by David Sorlien

picon face
I agree Tim. I spent five minutes of web searching and found some interesting
reading about this spammer. Not much we can do about it, many have tried to
muzzle the crook, none have succeeded. This link sums it all up:

http://members.theglobe.com/SpamSucks/spamspeak.html#worldtouch1.ram

Dave

Timothy D. Gray wrote:

> Someone please find out who this is and put an AXE through their computer
> or just mount a degaussing coil on top of their hard drive....
>
> On Thu, 16 Jul 1998, ____Bulll*sEye**_ wrote:
>
> > Subject:  _-*Bull_s*Eye*Targeting*Software-

1998\07\16@113515 by n/a

flavicon
face
David Sorlien wrote:
>
> I agree Tim. I spent five minutes of web searching and found some interesting
> reading about this spammer. Not much we can do about it, many have tried to
> muzzle the crook, none have succeeded. This link sums it all up:
>
> http://members.theglobe.com/SpamSucks/spamspeak.html#worldtouch1.ram
>
> Dave
>
> Timothy D. Gray wrote:
>
> > Someone please find out who this is and put an AXE through their computer
> > or just mount a degaussing coil on top of their hard drive....
> >
> > On Thu, 16 Jul 1998, ____Bulll*sEye**_ wrote:
> >
> > > Subject:  _-*Bull_s*Eye*Targeting*Software-

On the Magpage.com I've gotten a confirmed kill, on the one from uu.net
I've received and automated response. I'll probably have to wait a week
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'your mail'
1998\08\14@022248 by Dr. Imre Bartfai
flavicon
face
Hi,

I would suggest you get some higher-level language development
environment, such as PicBasic, PicBasic Pro or CCS. The prices are $99,
$249 and $99, respectively. Why I suggest them? Because of all of them
have a native RS232 and I2C support, so an appropriate access is one
single statement. No project files, no linking stuff etc. Your project
will consist of a single source file.

The compiled file can be burned using Picstart + (it is not a big deal for
it as the Tait's programmer is available for free - you need only build it
for less than $10).

The links:
http://www.melabs.com/mel/home.htm
http://www.ccsinfo.com/picc.html

I hope it can help you.

Imre

On Thu, 13 Aug 1998, Michael van der Zee wrote:

> hi,
>
> I'm new at this pic programming. I belive I need a push in the right direction
.
>
> I've got a pic 16c84 and a "picstart plus" programmer from microchip with mpas
m.
>
> I'm lost in all kinds of project files linkers and *.asm.
>
> What I like to do is the following,
>
> I need a I2C or UART (or any other) communication, and olso my own code ( I ne
ed to count inputs only). My own code is not the problem but compiling it with t
he I2C. Some AN*** directory's on the cd shiped with the programmer contain asm
files and other, but the files are all for different pic divices...??
>
> can I use these files on a 16c84 ..?
> do I need template's ..?
>
> I belive that it must be verry simple (couse thats what a read everywere) but
I'm lost.
>
> I olso keep getting the same error like this:
>
> *************
> (Lots of errors)
> Error[147]   C:\PROGRA~1\MPLAB\EXAMPLE\I2CBUS.ASM 391 : Directive not allowed
when generating an object file (ORG)
> Error[152]   C:\PROGRA~1\MPLAB\EXAMPLE\I2CBUS.ASM 392 : Executable code and da
ta must be defined in an appropriate section
{Quote hidden}


'your mail'
1998\09\29@143117 by kotay
flavicon
face
>
> Has the L293 Push-Pull Four Channel Driver been replaced by a newer =
> product?  The closest thing I can find is the LM18293, but their =
> datasheet shows it as an obsolete product.  Unfortunately, it doesn't =
> give a replacement!!
>
I think the L293D is still made by SGS-Thomson (it's listed
in my Mouser catalog).  However Texas Instruments makes an
improved version: SN754410NE.  The TI part has 1A current
capability as opposed to 600mA for the L293D.  Also, there
is extra logic to prevent glitches.

Keith

Keith D. Kotay
Ph.D. Candidate
Dartmouth College
RemoveMEkotayTakeThisOuTspamspamcs.dartmouth.edu
http://www.cs.dartmouth.edu/~kotay


'your mail'
1999\03\17@143428 by Byron A Jeff
face picon face
>
>      Hi there !
>
>      I want to build a programmable alarm-clock bases on a PIC. The use of
>      it is to turn ON & OFF lamps, and radios in different parts of the
>      house while I am on vacations (same time each day maybe for a week).
>      Precision is not to important, but I do need 8 programmable outputs.
>
>      Has anyone done something like this. Vacations are close & I want to
>      finish it.

I've done something like it. I have a couple of different light controllers.
One is sunset driven, then other controls my basement lights. Both use relays
to control their respective lights.

The one thing you'll need that I didn't is a real time clock. The PIC may
or may not be able to do the job depending on how well tuned the crystal is.
Or you can get a RTC like one of the Dallas Semi offerings.

There's several ways of putting it together. You could have multiple
self-contained units, one for each device you wish to control. Or for more
centralized control you could have one central unit and wire out control
lines to each device.

Good Luck,

BAJ

1999\03\19@012019 by : Cassie Carstens

flavicon
face
> >      I want to build a programmable alarm-clock bases on a PIC. The use of
> >      it is to turn ON & OFF lamps, and radios in different parts of the
> >      house while I am on vacations (same time each day maybe for a week).
Hi
Have done similar thing with ST62x
One port reads 4040 counter outputs(lower 5 bits). This is random
number in minutes and seconds. Three spare switches TV, lounge light
and kitchen. 4 more ports drive front rooms and barthroom.
Only one of the 4 lights is on at any particular time. The
tv+lounge+kitchen is always on. After 6 a random number is taken and
represents the minutes to wait before any lights get switched. The
seconds time is the delay between light off untill next light on
Oh yes, which light will get switched on ? The bits of the 4040
decides that. There are more features but i'm wasting bandwidth.
mail me.
Regards
Cassie


'your mail'
1999\09\16@101006 by John Hallam
flavicon
picon face
       You only need this if you want to determine the direction of a
once-off sound, though.  If the sound has any reasonable duration (unlike
the hand-clap signal mentioned earlier), you can do a fair job of finding
its direction by swivelling your ears to maximise amplitude or swivelling
your head to minimise arrival time difference.  Reflections can throw this
strategy off, but if the sensor system is moving the simple scheme works
even better.

       (We built a phonotaxis system (modelled on the cricket) using a
pair of tiny electret microphones, some electronic delay and mixing
circuitry, and a couple of A/D's to sit on top of a Khepera mobile robot.
It can follow the 4.7kHz mating calls emitted by male crickets.
Unfortunately it can't mate with them ;-)  Oh, and the programmable gains
and delays were controlled by a PIC speaking I2C protocol to a variety of
other bits and pieces.)

John Hallam
School of AI, Division of Informatics, University of Edinburgh, Scotland.

On Thu, 16 Sep 1999, Andy Kunz wrote:

> Nils,
>
> I would be interested in this as well.  I did some work on an audio
> tachometer, and limited myself to shotgun mikes.  To locate a direction,
> though, you'll need another technique, probably dealing as much with phase
> differential as anything else.
>
> Andy


'your mail'
1999\10\06@040958 by Dr. Imre Bartfai
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face
Hi,

AFAIK the Parallax Application Notes have an example. See
ftp.parallaxinc.com

Regards,
Imre


On Tue, 5 Oct 1999, a b wrote:

{Quote hidden}

1999\10\14@045200 by Dr. Imre Bartfai

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face
Hi,

I will mark below the errors and a suggestion for the correction.

Regards,
Imre

On Mon, 11 Oct 1999, Fansler, David wrote:

{Quote hidden}

;Instead:
                 bcf RP0
>                 bcf STATUS, RP1         ;
                 bcf RP1
>                 clrf PORTA                      ;clear all ouput latches
>                 clrf PORTB                      ;clear all output latches
>                 clrf PORTC                      ;clear all output latches
>                 clrf PORTD                      ;clear all output latches
>                 clrf PORTE                      ;clear all output latches
>                 bsf STATUS, STATUS.5    ;set to bank 1
; Uugh! It shows you misunterstand! Status.5 also contains the status
;address, such way it is completely confused. There are two good variants:
; either:
                 bsf  STATUS.5
;or (I prefer the former)
                 bsf  STATUS,5

{Quote hidden}

1999\10\14@045415 by Dr. Imre Bartfai

flavicon
face
On Mon, 11 Oct 1999, Agnes en Henk Tobbe wrote:

> Did you include the  standard file for the model PIC where RP0 and RP1 are
> defined....?

Hi,

it is not needed, and superfluous. Such standard file does not exist for
CVASM, rather the compiler itself has a built-in table.

Regards,
Imre

{Quote hidden}


'your mail'
2000\03\11@105054 by Byron A Jeff
face picon face
>
> I have heard that a /JW pic is destroyed if it is programmed with code
> protect. (That it is no longer possible to erease it with UV ligt and
> program it) Is this correct?

Yes. That is correct. The code protect bits are metal shielded from the UV
light from the windows. Once set the code is locked and the part is ruined.

If you can it's best to do development with a EEPROM based part like a
16F877. Simply erasing the part will reset the code protection. Plus with
in circuit tools like Tony Nixon's ROMzap (http://www.picnpoke.com/demo/ROMzap.zip)
which programs the part through the serial port, development can move very
quickly.

BAJ

>


'Your mail'
2002\09\13@213538 by cdb
flavicon
face
As you're in the UK, I'd suggest ordering (if Smiths don't have it)
one of the EPE mags tutorials - they are aimed at 'O'  and NVQ level
knowledge; plenty to get you started in electronics. Tandy I assume
still do the beginners books (but I'm 6 years out of touch there).

You'll need a multimeter etc, Might be an idea to pick up EPE mag
possibly Practical Wireless and have a read through and look at
http://www.epemag.wimborne.co.uk/wwwboard/chatzone.html.

Oh yes the tutorials are by Mike Tooley University of Hull.

Colin
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