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Author Topic: 3V LED Chaser project  (Read 22729 times)
audioguru
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« on: November 11, 2004, 11:28:17 AM »

Hi Guys,
The project is here:
http://www.electronics-lab.com/projects/games/003/index.html
I have a pic of my Veroboard layout. It has 47 (!) trace cuts which takes my drill-press about 2 minutes to do. It has 21 jumpers, a few under the ICs, that takes me abut half an hour to cut, bend and solder. It takes a while to solder the rest of the stuff on the board. See that I am using pieces of IC-socket to plug-on-to two LEDs that have their wires inside the box where it is crowded for soldering.

I had to be careful drilling the CD for the LEDs because it is fragile, my 1st one shattered all over the place!

I drilled the front of the box for the two LED holders to protrude through and routed-out the PCB support grooves at the sides to allow space for the pots.

I bought log (audio taper) pots for brightness controls and linear ones for speed control, but the linear ones were actually log type (marked wrong) so the full speed adjustment ends-up in the maximum 1/4 rotation of the pot.

I am busy making a bunch of these things for family and friends.

Corrected Nov.12/04
 
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audioguru
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« Reply #1 on: November 11, 2004, 11:32:08 AM »

Hi again,
Here's a pic of a finished board showing the parts and ribbon cables.
Also a piece of cut Veroboard with the traces cut.

Corrected Nov.12/04
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audioguru
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« Reply #2 on: November 12, 2004, 12:24:45 PM »

Hi Guys,
I am sorry that I made a boo-boo on my Veroboard layout and pic. I made another project and it didn't work!
Besides getting one AA cell backwards (darn Japanese battery cells with tits on both ends), I discovered that I had one extra trace cut (between pins 2 and 13 of the 74HC14).
I have corrected my layout and pic, above.
Sorry for any inconvenience.
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audioguru
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« Reply #3 on: November 13, 2004, 05:22:37 PM »

Hi Guys, (And warm greetings to the ladies amongst us)

Here's a pic of two 3V LED Chaser projects. It was difficult to snap a pic at the moment when both are lighted (even though they were chasing at high speed).

Between them might be the next project that I post, it very slowly dims and brightens its three colours, each at a slightly different rate. I used 30 degrees angle Ultrabright LEDs that make a magnificant display of 16 million colours on the ceiling. Every 10 minutes all LEDs are sync'd and are at their brightest, producing white, then 10 minutes later they all dim to nothing. All colours appear slowly in between.
The circuit uses a bootstrap technique so that the LEDs dim logarithmically, like our vision. At first I tried linear ramps, like the project that we already have, but it doesn't dim very much.
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Dazza
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« Reply #4 on: November 14, 2004, 06:51:14 PM »

Hi audioguru,
very nice, top job Cheesy. can I make these and sell them locally Huh
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audioguru
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« Reply #5 on: November 14, 2004, 09:27:24 PM »

Thanks Dazza,
Sure you can make and sell these thingies, I didn't patent anything. I just design them for fun and the challenge of making them work well with a power supply as low as 2V.

My only condition is that if I ever visit down under, you buy the 1st round of Guinness.  Grin Grin

Cry Kiss Undecided Lips Sealed Embarrassed Tongue Roll Eyes Huh Cool Shocked Sad Angry Grin Cheesy Wink Smiley
How can I make these faces loop vertically, like my LEDs?
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Dazza
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« Reply #6 on: November 14, 2004, 10:05:35 PM »

Audioguru, it's a deal Cheesy.  I'll first have to teach you, how to drink a Guinness upside-down Wink.

As for your question, a dozen Guinness should do the job nicely Tongue.
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audioguru
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« Reply #7 on: November 14, 2004, 10:29:48 PM »

Burp! 'Scuz me.

Let's see. The Guinness is upside down. I will also be upside down.
If I glug it really fast, it won't flow into the sky. Right, mate?
G'day t' ya.  Grin Grin
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Dazza
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« Reply #8 on: November 14, 2004, 11:21:57 PM »

Yes that's right, that way you won't give it a chance to get hot as well Grin.


I'm ready for the next one mate Tongue,
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« Reply #9 on: November 15, 2004, 11:37:37 AM »

Hi Audioguru,

These are two great projects you have there (don
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audioguru
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« Reply #10 on: November 15, 2004, 12:27:21 PM »

Thanks Ante,
I'm making a bunch of these 3V Chasers. I gave one to my (grown up) daughter for her birthday yesterday, and she says her friends will want them too. My friends and rest of my family also want them.

In my pics is my new Taiwan copy of Veroboard. It seems to be made of compressed dung, or similar stuff. It certainly isn't epoxy-glass and stinks during soldering. I hope it doesn't warp too much.

What happened to the division of Vero that made Veroboard and other prototyping things? I liked the "real stuff" and know that Brits would never use dung. I viewed their "new" website a few months ago but now it's gone.
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Ante
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« Reply #11 on: November 15, 2004, 03:07:53 PM »

I can see your CD collection going down the drain right now, while you are trying to keep up with the demand.
I am also missing the old blue stuff, I still have a small stock but I don
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Dazza
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« Reply #12 on: November 15, 2004, 06:54:00 PM »

Audioguru, surprise surprise, Farnell doesn't have a listing for the(CD74HC4017N) please tell me there is an alternative Huh.  Also Farnell does have a listing for the(CD74HC14N) although it is not a (N) it's a (M) will this do the job Undecided.

Thank you
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audioguru
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« Reply #13 on: November 15, 2004, 07:21:05 PM »

Hi Ante,
A big joke over here was, "What are we going to do with all those free ISP CD Roms?" I found a use for them.
While searching in my son's room for his digital camera, I discovered that his stack of virgin CD-Rs or CD-RWs create a very intense rainbow reflection effect, so i "borrowed" a few. I'll use them next. They are darker than the ISP's ones and the label side has a pleasant diffused reflection. They are slightly transparent so I hope the LED wiring doesn't show through.
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