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'[EE] live video on NKK Smartswitch'
2004\08\29@174525 by Bob Blick

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part 1 5348 bytes content-type:Multipart/Alternative; boundary="Alt-Boundary-6432.3331676" (decoded 7bit)
Content-type: Multipart/Alternative; boundary="Alt-Boundary-6432.3331676" --Alt-Boundary-6432.3331676 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body I got a few of those NKK Smartswitches from Dal Wheeler and while looking at the data sheet I realized that NTSC video has very similar timings to their recommendations. It was very easy to do, I used two transistors, a hex inverter and a 1-of- 10 counter and very little else. I will probably work on it a little more in the coming weeks, the video buffer is the weak link and I think if I do some dithering it will do an acceptable grayscale, but this is what I could do in a few moments stolen from weekend honeydew chores. You'll notice the video is mirrored left for right, and Tux the penguin looks a bit like the zig-zag man, but it works. I've tested it with CNN and if you have sound on you can sort of tell what is going on :) I'll make a real web page for the public sometime, but here's a preview for loyal PICLIST readers: The schematic: http://bobblick.com/smartswitch/schematic.gif The whole setup running: http://bobblick.com/smartswitch/proto.jpg A closeup of the screen: http://bobblick.com/smartswitch/closeup.jpg Recommended use: http://bobblick.com/smartswitch/use.jpg By the way, for anyone messing with these things, they are pretty forgiving except for the timing relationship between FLM and LP. Not that I can say what that is, but they do have to be synchronized and which is first is important. And thanks to Dal for being a source for them. Cheerful regards, Bob --Alt-Boundary-6432.3331676 Content-type: text/html; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body
I got a few of those NKK Smartswitches from Dal Wheeler and while looking at the data sheet I realized that NTSC video has very similar timings to their recommendations.

It was very easy to do, I used two transistors, a hex inverter and a 1-of- 10 counter and very little else.

I will probably work on it a little more in the coming weeks, the video buffer is the weak link and I think if I do some dithering it will do an acceptable grayscale, but this is what I could do in a few moments stolen from weekend honeydew chores.

You'll notice the video is mirrored left for right, and Tux the penguin looks a bit like the zig-zag man, but it works. I've tested it with CNN and if you have sound on you can sort of tell what is going on :)

I'll make a real web page for the public sometime, but here's a preview for loyal PICLIST readers:

The schematic:
http://bobblick.com/smartswitch/schematic.gif

The whole setup running:
http://bobblick.com/smartswitch/proto.jpg

A closeup of the screen:
http://bobblick.com/smartswitch/closeup.jpg

Recommended use:
http://bobblick.com/smartswitch/use.jpg

By the way, for anyone messing with these things, they are pretty forgiving except for the timing relationship between FLM and LP. Not that I can say what that is, but they do have to be synchronized and which is first is important.

And thanks to Dal for being a source for them.

Cheerful regards,

Bob

--Alt-Boundary-6432.3331676--
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Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit _______________________________________________ http://www.piclist.com View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist
part 3 5 bytes
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2004\08\29@175651 by Dave VanHorn

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At 04:46 PM 8/29/2004, Bob Blick wrote:
>http://bobblick.com/smartswitch/closeup.jpg

ROTFLMAO!

That's COOL!


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2004\08\29@182340 by D. Jay Newman

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> I got a few of those NKK Smartswitches from Dal Wheeler and while
> looking at the data sheet I realized that NTSC video has very similar
> timings to their recommendations.

Wow!

This is a truely wonderful hack!
--
D. Jay Newman           ! DCX - it takes off and lands base down,
spam_OUTjayTakeThisOuTspamsprucegrove.com     !       as God and Robert Heinlein intended.
http://enerd.ws/robots/ !
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2004\08\29@202957 by Josh Koffman

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Holy Moly that's cool! Brilliant work Bob!

Shame about that little guy's hemmroid problem. Guess he's trying one
of those alternative electromagnetic pseudotherapies?

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
       -Douglas Adams

----- Original Message -----
From: Bob Blick <.....bblickKILLspamspam@spam@sonic.net>
Recommended use:
http://bobblick.com/smartswitch/use.jpg
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2004\08\29@211909 by picaccount

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Bob, you crack me up.  That's priceless!
-Dal

-----Original Message-----
From: Bob Blick

I will probably work on it a little more in the coming weeks, the video
buffer is the weak link and I think if I do some dithering it will do an
acceptable grayscale, but this is what I could do in a few moments stolen
from weekend honeydew chores.

The whole setup running:
http://bobblick.com/smartswitch/proto.jpg


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2004\08\29@212438 by William Chops Westfield

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On Aug 29, 2004, at 2:46 PM, Bob Blick wrote:

> I got a few of those NKK Smartswitches from Dal Wheeler and while
> looking
> at the data sheet I realized that NTSC video has very similar timings
> to
> their recommendations.
>
>
> It was very easy to do, I used two transistors, a hex inverter and a
> 1-of- 10 counter and very little else.
>

That's just neat.

I've always wanted a cheap converter to run (almost) VGA video on the
surplus
laptop LCD screens that are available, for cheap embedded displays
using all
those cheap computers with built-in VGA output.  I'd be happy with
monochrome
640x400, or even less, and slow update times (several video frames to
update
the lcd once?)
(like http://www.allelectronics.com/cgi-bin/category.cgi?item=LCD-103)
Between your hack and the recent CCInk article on graphics LCDs,
I'm starting to get motivated...

Hmm.  Your circuit could trivially drive three swicths from a VGA output
with sufficiently slow sync rates; one each on R/G/B outputs?  (double
hmm.
everyone focuses on how HIGH a res and refresh rate a VGA card can
drive.
But how SLOW are they willing to go?)

BillW

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2004\08\29@212724 by Dave VanHorn

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I was thinking of using one of these on an alarm system, and the video would be rather cool. I could direct one of those tiny cameras, so your face ends up on the switch screen.. :)

That, and an encoder so you operate it like a combination lock.

Red light "ARMED" , Turn..29, push, 37, 19 Green, "OK"

Something like that anyway.

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