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'[EE]: TV Video Signals'
2001\07\30@124043 by Dave

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Hi,

I want to display images on a TV set using a PIC. However, generating the
video signals myself will complicate the project quite a bit, and not leave
time for other, more important aspects of the project. As this is a project
idea for my final year of my degree in Software Engineering, if I encounter
many problems in generating the signals it could seriously affect my degree.

I was wondering if there were any fairly cheap chips around to help with the
video signal generation? Something I could easilly interface with a PIC to
simplify things somewhat. As I sort of said, I am not an electrician. I'm a
programmer. Electronics is just a bit of a side hobby, and hence I do not
know that much about it.

Regards,

David Stubbs

WEB: http://www.nti-uk.com
TEL UK: 07968 397782


> {Original Message removed}

2001\07\30@154148 by John Ferrell

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I hate to rain on your parade, but the line scan time is only about 65 micro
seconds.  The book "Programming and Customizing PICmicro(R)
Microcontrollers" by Myke Predko addresses the problem quite well.

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"



----- Original Message -----
From: "David Stubbs" <spam_OUTn0p3xTakeThisOuTspamN0P3X.WORLDONLINE.CO.UK>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Monday, July 30, 2001 11:54 AM
Subject: [EE]: TV Video Signals


> Hi,
>
> I want to display images on a TV set using a PIC. However, generating the
> video signals myself will complicate the project quite a bit, and not
leave
> time for other, more important aspects of the project. As this is a
project
> idea for my final year of my degree in Software Engineering, if I
encounter
> many problems in generating the signals it could seriously affect my
degree.
>
> I was wondering if there were any fairly cheap chips around to help with
the
{Quote hidden}

> > {Original Message removed}

2001\07\30@160116 by Tony Goetz

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As does this website, which uses a 16F84 overclocked to 12Mhz (okay, maybe
not the best thing to do, but neat nonetheless) to generate a b&w NTSC/PAL
video signal in simple Pong and Tetris games. Near the bottom of the Pong and
Tetris articles are links to info about video signals in general. If this
site has been posted before I apologize for being redundant - for some reason
I hadn't noticed this thread until now!

http://www.efd.lth.se/~e96rg/mc/mc.html

-Tony


<< I hate to rain on your parade, but the line scan time is only about 65
micro
seconds.  The book "Programming and Customizing PICmicro(R)
Microcontrollers" by Myke Predko addresses the problem quite well.

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy" >>

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2001\07\30@161205 by Dal Wheeler

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Well, there were a few serial to overlay boards out there, this is one...
66.1.20.29/products/..%5Cproducts%5Cspecs%5CVideo%20Overlay%20Board.h
tm
--For ~$80 you won't have to think about timing, etc...
I remember Jameco carried a similar board by the late ITU guy (Chris
Sakkas); I'm not sure if you can still get them there.

If you want to hack out your own video generator (and you aren't trying to
do anything time intesive with the pic) --look at
http://www.brouhaha.com/~eric/pic/pictock.html
--There are plenty of examples out there...

The first reference is probably more applicable to your situation
(time) --just pay the money and concentrate on the rest of your project.

-Dal

> {Original Message removed}

2001\07\30@165621 by jamesnewton

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www.sxlist.com/techref/ubicom/contest/video.htm

---
James Newton
1-619-652-0593 VM 1-208-279-8767 FAX
.....jamesnewtonKILLspamspam.....sxlist.com
SX FAQ: http://www.sxlist.com



{Original Message removed}

2001\07\30@185852 by Mike Hardwick

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>I was wondering if there were any fairly cheap chips around to help with the
>video signal generation? Something I could easilly interface with a PIC to
>simplify things somewhat. As I sort of said, I am not an electrician. I'm a
>programmer. Electronics is just a bit of a side hobby, and hence I do not
>know that much about it.

David,

I recommend the BOB-II module, but of course I'm biased. It's my design!
See here: <http://www.decadenet.com>

Mike Hardwick
Decade Engineering

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2001\07\31@052843 by kayode.ayandokun

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David Stubbs <n0p3xspamspam_OUTN0P3X.WORLDONLINE.CO.UK> wrote:
> Hi,
>
> I want to display images on a TV set using a PIC. However, generating the
> video signals myself will complicate the project quite a bit, and not leave
> time for other, more important aspects of the project. As this is a project
> idea for my final year of my degree in Software Engineering, if I encounter
> many problems in generating the signals it could seriously affect my degree.
>
> I was wondering if there were any fairly cheap chips around to help with the
> video signal generation? Something I could easilly interface with a PIC to
> simplify things somewhat.

What you could use would depend on the nature of the images you need to
display.  If you can use text and graphics characters I suggest you
visit http://www.stv5730A.co.uk and have a look at the 16F84/628 on
screen display project board.

Features:
* 16F84 microcontroller for flexible development.
* STV5730A on screen display IC gives 28 characters by 11 row screen
* 128 text and graphics characters defined in ROM
* Text over video or self generated video signal
* 10 16F84 i/o lines allow easy interface to sensors, keypads, etc
* Power supply 5V dc or 9 - 12dc via on board regulator
* Free demo software
* Enclosures, accessories and connectors available

For general information the STV5730A is due to cease production in May
of next year and most distributors will not accept orders after November
of this year.

Kayode.

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2001\07\31@114714 by miked

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No, they had just put it in their catalog when he died and I was unable to
order one. It was the smallest and lowest cost one out there.
BTW the STV5730A used in the BOB II, Intuitive Circuits, DT108 and
BlackBox Camera OSDs is to be discontinued.
{Quote hidden}

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2001\07\31@115731 by Roman Black

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Mike DeMetz wrote:
>
> No, they had just put it in their catalog when he died and I was unable to
> order one. It was the smallest and lowest cost one out there.
> BTW the STV5730A used in the BOB II, Intuitive Circuits, DT108 and
> BlackBox Camera OSDs is to be discontinued.
> > From:    Dal Wheeler <KILLspamdwheelerKILLspamspamINSIGHTEK.COM
> >
> > Well, there were a few serial to overlay boards out there, this is one...
> > http://66.1.20.29/products/..%5Cproducts%5Cspecs%5CVideo%20Overlay%20Board.h tm
> > --For ~$80 you won't have to think about timing, etc... I remember Jameco
> > carried a similar board by the late ITU guy (Chris Sakkas); I'm not sure if you
> > can still get them there.


I found a TV pattern generator circuit on the net,
using a PIC I think, and it had a dedicated video
chip that I recognised as a typical TV part. Looked
cheap and simple, and colour too. :o)
It may have been on the picmicro web ring?
Sorry I can't remember more than that.
-Roman

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2001\07\31@122452 by Duane Brantley

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What about this?

http://www.dontronics.com/dt108.html

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'[EE]: TV Video Signals'
2001\08\01@123302 by Dave
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Hi

>I hate to rain on your parade, but the line scan time is only about 65
micro

I know. I have done some research myself before posting.

>As does this website, which uses a 16F84 overclocked to 12Mhz (okay, maybe
>not the best thing to do, but neat nonetheless) to generate a b&w NTSC/PAL
>video signal in simple Pong and Tetris games.

I've checked this out also. There is also another site with Pong made from a
PIC. I have read through the further reading links as well. A better idea
would be to just use a faster PIC in the first place rather than
overclocking.

>If you can use text and graphics characters I suggest you
>visit http://www.stv5730A.co.uk and have a look at the 16F84/628 on
>screen display project board.

I've had a look here. Looks good. I'm going to look into it further though.
Very cheap as well. That's why i'd prefer it over BOB-II. Although BOB-II
looks good. Sorry Mike. I'd go for the cheaper option.

Regards,

David Stubbs

WEB: http://www.nti-uk.com
TEL UK: 07968 397782


> {Original Message removed}

2001\08\02@063118 by kayode.ayandokun

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{Quote hidden}

I think you'll find the real advantage of the project board is that it
is programmable so you can run existing PIC code modules on it and only
have to worry about writing the screen display logic.  Even this can be
simplified if you adapt PIC code for writing to LCDs.

If you are interested in reading more there was a short article in the
magazine British Amateur TV Club CQ-TV issue 194 pg 45, available from
http://www.btinternet.com/~ian.pawson/cq-tv/cq-tv194.pdf

The article describes programming the project board.

Kayode

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