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'[EE]:'
2000\11\15@234626 by yansong gu

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Hi picers,

looking for segmented calculator kind lcd (8 or more digit ), any body has a
source? also, anyone had a problem using 5.579545MHz crystal (2x22pf)doing
8bit lcd? my 4mhz crystal is still on its way from jameco.

Yansong

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2000\11\16@092522 by Thomas McGahee

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Check Varitronix. They have a good selection of raw LCDs. Digi-Key
handles some of their product line, but not all. Their web site
has drawings and pinouts.

As to the use of the 5.579545MHz crystal, you will most likely
find that it will work OK. For production I would move up to a
higher speed PIV, of course.

Fr. Tom McGahee


{Original Message removed}


'[EE]:'
2000\12\05@201645 by William
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Hi!

I would like to know is there any good web-site teaching PCB making, coz

I plan to homebrew a double side PCB, anyone have any idea for easy and
cheap way to make PCB?

Thank you

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'[EE]:'
2001\03\10@030738 by Joe Denehan
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I'm building a circuit that reads from the BCD input of a 7-segment decoder.
I'm using LE as the trigger to the PIC16F84 to capture the BCD code. Problem
is when I connect to the input of the BCD chip 4511 the 7-segment display
flickers and displays wrong digits, I tried using a opto-isolator and an
Op-amp 741( as Unity Gain Follower) but the display I'm reading from is
still affected by branching the trigger to my circuit, circuit works OK on
breadboard with clock for trigger. Anyone any ideas?

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2001\03\10@030738 by Joe Denehan

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I'm building a circuit that reads from the BCD input of a 7-segment decoder.
I'm using LE as the trigger to the PIC16F84 to capture the BCD code. Problem
is when I connect to the input of the BCD chip 4511 the 7-segment display
flickers and displays wrong digits, I tried using a opto-isolator and an
Op-amp 741( as Unity Gain Follower) but the display I'm reading from is
still affected by branching the trigger to my circuit, circuit works OK on
breadboard with clock for trigger. Anyone any ideas?

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2001\03\10@080451 by Roman Black

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Joe Denehan wrote:
>
> I'm building a circuit that reads from the BCD input of a 7-segment decoder.
> I'm using LE as the trigger to the PIC16F84 to capture the BCD code. Problem
> is when I connect to the input of the BCD chip 4511 the 7-segment display
> flickers and displays wrong digits, I tried using a opto-isolator and an
> Op-amp 741( as Unity Gain Follower) but the display I'm reading from is
> still affected by branching the trigger to my circuit, circuit works OK on
> breadboard with clock for trigger. Anyone any ideas?


Yes, you are obviously loading the inputs to
the 4511. Being cmos logic, whatever drives them
should be ok to drive 10 or more cmos inputs.

The only sensible guess would be that you have
not configured the PIC inputs properly, and you
are connecting PIC outputs to the 4511.
Check your code that sets the tristate in/out
settings for the PIC pins you are using, and
especially check the bank switching for the PIC
chip, on some chips the TRISB etc are on the
same bank as the PORTB, other PIC chips you have
to change banks to do the tristate.
-Roman

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2001\03\10@094503 by Philip Martin

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Hi,

On top of what Roman Black has said, are you using the data latch facility
of the 4511?

Put the data onto the bus and then pulse pin 5 low to latch the data to the
decoder. After that, so long as pin 5 is high, you should be able to read
the bus without upsetting the display.

Philip Martin.


{Original Message removed}


'[EE]:'
2001\05\27@151727 by Chris Carr
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>
> It matters because my driver is NOT o.c.

Then the bus is not I2c. I suggest you re-read the
specification, better still - this document is better as it
includes how to use it instructions

http://www-us.semiconductors.philips.com/acrobat/various/I2CBUS.pdf

Chris Carr

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2001\05\28@025027 by Peter L. Peres

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Chris (Carr): do you mean this:

The I 2 C-bus and how to use it
(including specifications)
1995 update

? Cos' if you do, this is the document I referred to in my original
posting. I will be using Rs as in Fig.24 in said document but still I'd
like to solve the mystery. In the end I'll have to tristate I think, or
use two pins on the host for SDA and a NPN as OC driver, or even a shottky
diode and a resistor in antiparallel. Oh well, I tried hard.

thanks to all who answered, esp. Roman Black, Olin Lathorp and Chris Carr.

Peter

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'[EE]:'
2001\11\01@135449 by Michael Mattson
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Engineers,

 New Exciting Embedded Opportunity!!!!!!!!!!!!

    I am currently conducting a search for a Bay Area based company that is
looking for a Solutions Architect. Please let me know if you might know of
anyone who would have an interest in hearing about the position listed below.
Thanks for any assistance you may be able to provide.

Solutions Architect.

-This engineer will work closely with business development and sales
personnel in a team to close license agreements.
-The Solutions Architect will be the key technical point of contact for the
customer/prospect.
-Responsibilities include establishing close relationships with the
customer's technical people (CTOs and VPs of Engineering to design
engineers), working with engineering and marketing to develop technical
expertise in products (CPU cores and Architecture), performing benchmarks for
customers, and performing competitive analyses.
-This engineer will also support customers in answering technical questions
regarding implementing in an SOC (System on chip).
-A key aspect of the job is the ability to work out with the customer a
complete system solution including a CPU, hardware IP, middleware and
operating system.

Regards,

Michael Mattson
spam_OUTMikeM0069TakeThisOuTspamaol.com

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2001\11\01@140758 by Jeff DeMaagd

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----- Original Message -----
From: Michael Mattson <MikeM0069spamKILLspamAOL.COM>

> a Bay Area based company that is

Hmm, which bay?  It has been a while since I have taken geography but last I
heard there are lots of them.

Jeff

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2001\11\01@142805 by Michael Mattson

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Mountain View, Ca.

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2001\11\01@180721 by Olin Lathrop

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> > a Bay Area based company that is
>
> Hmm, which bay?  It has been a while since I have taken geography but last
I
> heard there are lots of them.

Here in the US an unqualified "bay area" is usually understood to mean the
San Francisco Bay area in California.  This is even true where I am, 3000
miles accross the continent and much closer to the much larger Massachusetts
Bay.  (Although around here a comment might be added about those flaky
Californians.  How many Californians does it take to screw in a light bulb?
About six, one to turn the bulb and five to share in the experience ;-) ).


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olinspamspam_OUTembedinc.com, http://www.embedinc.com

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2001\11\02@035958 by Vasile Surducan

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On Thu, 1 Nov 2001, Olin Lathrop wrote:

 How many Californians does it take to screw in a light bulb?
> About six, one to turn the bulb and five to share in the experience ;-) ).
>
>
 he, he, he...  And I believe you're an alien !

Vasile

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2001\11\19@091024 by Kathy Quinlan

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Hi all sorry for cross posting but this is a big screw up (it is on a pc so
no wonder)

I have a Tyan Trinity KT - A motherboard in my 18 year old sons PC, I tried
to flash the bios, and the utility hung solid. I can still boot with a bios
checksum error, but the flash upgrade, will not run as the chips header has
been destroyed, so it thinks it is not an award bios chip. Any ideas ???

Or am I up for a new MB and needing to copy the flash chip in an external
programmer ???

Regards,

Kat (in desperation mode as 18 year old males get pissed off easily)

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2001\11\19@092705 by Gordon Varney

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Kat,
       The default solution is to put the Bios chip into a programmer and burn the code to it like an old EPROM. I have had to
do this before. Most of the time the flash code is still in a hex format.

The last time I had to do this the Bios was still in a dip chip version. :-)

Good luck

Gordon Varney




{Quote hidden}

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2001\11\19@101750 by Kathy Quinlan

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I am lucky it is a dip 2mbit chip :o)

I have extracted the bin file (the original is a self extracting win zip)

My hilo programmer does not do the flash chip (mutter mutter mumble mumble)

<Jinx mode>

I am cursed and life is against me ;o)

</Jinx mode>

Regards,

Kat.
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{Original Message removed}

2001\11\19@164803 by brandon

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Since the mobo can reprogram chips, I wonder how hard it would be to use one as a programmer? hehe

_____________________________________________________________
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2001\11\20@200732 by Jinx

face picon face
> <Jinx mode>
>
> I am cursed and life is against me ;o)
>
> </Jinx mode>
>
> Regards,
>
> Kat.

<grouchy_old_git_who_still_looks_to_the_stars>

Ya takes a lickin', ya keeps a-tickin'

</grouchy_old_git_who_still_looks_to_the_stars>

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2001\11\20@205610 by Alexandre Domingos F. Souza

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>I have a Tyan Trinity KT - A motherboard in my 18 year old sons PC, I tried
>to flash the bios, and the utility hung solid. I can still boot with a bios
>checksum error, but the flash upgrade, will not run as the chips header has
>been destroyed, so it thinks it is not an award bios chip. Any ideas ???
>Or am I up for a new MB and needing to copy the flash chip in an external
>programmer ???

       You have 2 (maybe 3) ways of fixing it:

       1 - Using an external programmer. Duh.
       2 - Using an exact copy of the BIOS, inserted on the socket. After boot, CAREFULLY (blink attribute ON) take the memory off the socket, put your empty memory, flash the bios. It works! I did it in about a hundred motherboards before I got my "more or less universal" programmer
       3 - Use an EPROM burn (burned?) with the original BIOS code. Same trick of swapping the chip

       Well, all three are feasible, tried and done. You are on your own ;o)


---8<---Corte aqui---8<----

Alexandre Souza
RemoveMEtaitoTakeThisOuTspamterra.com.br
http://planeta.terra.com.br/lazer/pinball/

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2001\11\20@211919 by Alexandre Domingos F. Souza

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>I have extracted the bin file (the original is a self extracting win zip)
>My hilo programmer does not do the flash chip (mutter mutter mumble mumble)

       Kat (meow), which Hi-Lo program do you have? Do you know almost all Hi-Lo (dream of mine, hehehe) programmer has updates up to 27C080 and most flash/etc devices on their page?

><Jinx mode>
>I am cursed and life is against me ;o)
></Jinx mode>

       ROTF! ;oD


---8<---Corte aqui---8<----

Alexandre Souza
spamBeGonetaitospamBeGonespamterra.com.br
http://planeta.terra.com.br/lazer/pinball/

---8<---Corte aqui---8<----

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'[EE]:'
2002\04\12@215137 by toby
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i have a weather station that spits out rs232 hex data at five second
intervals. if i leave the computer on 24/7 i can capture the data via the
rs232 port not a problem. i would how ever like to be able to turn the pc
off and have a logger or buffer store the data off line until i next turn
my pc on (anywhere between a day, week or longer).
i am not much of an eletronics person but i am sure some one would be able
to design/build a unit that can do this.
if any one is interested they can email me i and will send copies of the
rs232 data strings and any other information i can.

thanks again

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2002\04\15@185305 by Tony Nixon

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picon face
toby wrote:
>
> i have a weather station that spits out rs232 hex data at five second
> intervals. if i leave the computer on 24/7 i can capture the data via the
> rs232 port not a problem. i would how ever like to be able to turn the pc
> off and have a logger or buffer store the data off line until i next turn
> my pc on (anywhere between a day, week or longer).
> i am not much of an eletronics person but i am sure some one would be able
> to design/build a unit that can do this.
> if any one is interested they can email me i and will send copies of the
> rs232 data strings and any other information i can.
>
> thanks again


Hi Toby,

I can probably knock up something simple for you.



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'[EE]:'
2002\08\23@191821 by yansong gu
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apology for those who received this earlier!

Hi Picers,

I recently made a pcb of 8x8 keypad of two "E"s facing eachother at the
connecting point.  Somehow, the port always gives errant value when it is
supposed to be "0" since there is no input.  Is this a capacitance or
resistance problem?  any help greatly appreciated.


Yansong

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2002\08\26@105758 by Francisco Ares

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Do you have pull-down resistors in the reading part of the port to
ensure the "0" reading?

Francisco


yansong gu wrote:

{Quote hidden}

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'[EE]:'
2002\09\03@214933 by Harry Sokol
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Some months ago I came across some references to a 'robot' constructed using
Swatch watch motors as the motive force, and a PIC chip as the controller.
As per usual, all such references ( URL's ) have disappeared from my PC. Can
anyone point me to a web site with this type of device?

harry...


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2002\09\03@223438 by Dwayne Reid

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At 11:41 AM 9/4/02 +1000, Harry Sokol wrote:
>Some months ago I came across some references to a 'robot' constructed using
>Swatch watch motors as the motive force, and a PIC chip as the controller.
>As per usual, all such references ( URL's ) have disappeared from my PC. Can
>anyone point me to a web site with this type of device?
>
>harry...

I entered the following string into google: Swatch watch motor PIC
and came up with http://www.eee.bham.ac.uk/woolleysi/swfyp97.htm

dwayne

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2002\09\04@011541 by Harry Sokol

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Yup, been there....
The site I was looking for wasn't a University site, just 'someone's' stuff.
Thanks anyway :}

( Think I might repost with something in the subject line )

harry...




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2002\09\04@190757 by M. Adam Davis

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I recall a BEAM robotics site about using a ladies watch (could've been
swatch, don't recall) for the motors.

-Adam

Harry Sokol wrote:

{Quote hidden}

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2002\09\11@072853 by Russell McMahon

face
flavicon
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Atmel Introduces Industry's First 2.4-GHz DECT Non-Blind-Slot RF Transceiver
IC for Voice and Data Applications

New IC combines to form a complete 2.4GHz DECT System


http://www.futurlec.com/News/Atmel/Phone.html

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'[EE]:'
2002\10\06@090421 by Charles Rogers
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2002\10\06@130759 by Sean H. Breheny

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You don't say!

At 08:02 AM 10/6/2002 -0500, you wrote:

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Introducing NetZero Long Distance
Unlimited Long Distance only $29.95/ month!
Sign Up Today! http://www.netzerolongdistance.com

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'[EE]:'
2003\01\26@200947 by Cosmin Nedelcu
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2003\01\26@202646 by Jinx

face picon face
Get a     and measure the     . If that looks OK it could be
the    and/or the     . A new     from costs about $      but
shop around. Hope that helps

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2003\01\26@213540 by Gies Family

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      !     ,                           ,             .           ?

Okay, JOKE STRETCHED FAR ENOUGH.

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'[EE]:'
2003\06\04@144813 by Tom Page
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Apologies if this message is of no concern to you

I am currently re-writing an electronics design module to include the
programming the PIC16F84 with the aid MPLab for DC and stepper motor and
motion control applications.  The students studying on this course are not
Electronic Engineering students but design students with limited electronics
background.  Therefore the students need to gain a more practical knowledge
and understanding of PIC programming so that they can embody the PIC
programming in their main design projects.

I am really trying to find out which would be the best approach for teaching
& learning on programming the PIC16F84.  For example, would it more useful
if I make the course project based with different applications of PICs?  To
what extent would such students need to know about the architecture and
associated theory of the PIC16F84 to support this?  Although the students
can read relevant books, data sheets and work through on-line tutorials, of
which there are many, I'm really trying to strike a balance between
effective practice based teaching and learning with PICs.   I Again I
apologise if this email is of no concern to you.

Regards
Tom

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2003\06\04@151126 by Wouter van Ooijen

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> I am currently re-writing an electronics design module to include the
> programming the PIC16F84 with the aid MPLab for DC and
> stepper motor and motion control applications.

Check http://www.voti.nl/cursus/e_index.html for my approach to learn
12-18 year old boys to use a 16f84.

Read http://www.voti.nl/swp before doing anything with PICs.

Forget the 16F84. Depending on your needs (A/D, number of pins, UART,
speed, memory) there are lots of PICs to choose from. If a 16F84 was OK
then a 16F630 will probably do an it is much cheaper (I assume your
students fill fry some chips in the process).

Wouter van Ooijen

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'[EE]:'
2004\03\16@030612 by Arron McLaughlin
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_________________________________________________________________
Need more speed? Get Xtra JetStream  @ http://xtra.co.nz/jetstream

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