LED Scanner

So I stumbled across some post about them on here, but I am still clueless.

I want the scanner to go back and forth, but all the diagrams I see about 95 percent I dont understand on it.

What my plan is, is to make it my theft light flasher.

Any help would be appreciated!

-Lance

So I just ordered the 555 IC, but I can't find the 4017 chip anywhere.

This is the circuit I am using: http://img341.imageshack.us/img341/9517/ledsequencerez8.gif (dunno if it is the right one)

Also, I ordered some LEDs off Oznium with some resistors today, will I will still be able to hook this up to a 12v source even though it says 5 to 6 in the diagram?

^^^
I didn't look up any of the IC's on the diagram but I'm assuming the pins the 4.5-6V connects to are the input pins. If that's the case you will need to put a resistor in series to lower the voltage from 12V to 4.5-6V. 12V would fry the IC.

I'd be interested to see this (subscribed)

If you bought the resistors that come with the leds then you can hood up as many as you would like as long as they are wired in parallel. I think it is like 4 or 5 if you do them in series without resistors. As for the scanner. I just buy the led meteors. But he is out of all colors but green i think idk. It has some nice patterns on it and is simple. I have 8 meteor kits and i love em. Really nice cuz they can do like 6 or so different patterns from scrolling to strobing to steady on.

If you're lookin for more meteors anybody check out http://customsoundandmore.com/catalog/
Exact same ones they were selling here and they have all the colors including UV

The meteor kit is nice, however the LEDs are groups in sections of 3. Even if you were able to hook them up in the proper sequence, it would hardly constitue a "scanner" What you could do is hook up each LED of th meteor individually (12 I think) and that would make a nice scanner

Nobody's mentioned so far that this chip is for a counter....

Ex. Led# 1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10.........

you're wanting a scanner,
Ex. Led# 1,2,3,4,5,6,7,8,9,10,9,8,7,6,5,4,3,2,1,2,3.....


Just wanted to point that out, if you hook it up and everything works like it's supposed to it will scroll through the LED's and then start over rather than scrolling through, scrolling backwards and then starting over.

Nice idea though, I wonder if you put bigger transistors in and ran 12V through them would you be able to control bigger loads, like up to 1Amp? I'm thinking that it'd make a sweet scrolling feature for something circular...without the blasted clicking of 10 relays clicking at 15 Hz.....

Remember as well that if you use this according to the diagram it will run at 15hz...so it will only take it 2 seconds to cycle 3 times....just to keep it in mind.

mx107marlin wrote:

Nice idea though, I wonder if you put bigger transistors in and ran 12V through them would you be able to control bigger loads, like up to 1Amp? I'm thinking that it'd make a sweet scrolling feature for something circular...without the blasted clicking of 10 relays clicking at 15 Hz..... Remember as well that if you use this according to the diagram it will run at 15hz...so it will only take it 2 seconds to cycle 3 times....just to keep it in mind.

For the diagram it's at 15Hz but that's EASILY changed. Change the time constant of the circuit and you can make the frequency whatever is desired.

To fix the 1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,.... Just make the scanner only 5 LEDs long that way LEDs 1,2,3,4, and 5 are in a "forward" direction while LEDs 6,7,8,9, and 10 are in a "backward" direction.

Good. That will help.

Found this:

http://i14.photobucket.com/albums/a327/jethawk/LEDhelp3.gif

Will that work?

Only, I want 10 leds only...and I will have different resistors, the ones I ordered with my Red LEDS from Oz.

Any Idea where I can get some 4017's? I have searched and searched and no one has them.

Thinks I would change...I would use 1 LED instead of 2 per output pin. Instead of using 10 resistors, I would use one resistor (placed on the ground wire). I wouldn't use a 47K Ohm resistor and 1uF Capacitor, 15Hz will be WAY too fast. I would shoot for something around 1Hz to 1/2 Hz.

I believe the chip you're looking for is a 4016, I've never heard of this 4017.

So get rid of the 47k ohm resistor and uF capacitor...or downgrade them.

The scanning frequency is 1.44/(2*R*C)

WOW you guys are over my head there lol. But if you just want a little theft deterrant scanner then i know autozone sells them. But if you want to make one for the sake of doing it your self more props to ya man. But like i said i know autozone or advanced auto sells them. Dont know the price tho. GOOD LUCK..and thanks everyone for helpin him out

With that setup you WILL NOT be able to make a 10 LED scanner, you could make a 5 LED scanner by hooking pins 3, 2, 4, 7, and 10 to LED's 1, 2, 3, 4, and 5 respectively, then hooking pins 1, 5, 6, 9, and 11 to LED's 5, 4, 3, 2, and 1 respectively.

That would create a scanner that will go back and forth on 5 LED's

So it would light up LED's 1, 2, 3, 4, 5, 5, 4, 3, 2, 1 and repeat. The LED's on each end will be lit by twice the rate of flash, so if you go with 1 Hz, they will run at .5Hz, if you run the counter at 15Hz, they will run at 7.5Hz, while the other lights (2,3,4) run at 15Hz.

^^^
Right, that's what I was trying to say earlier but it wasn't as clear as you stated.

mx107marlin wrote:

With that setup you WILL NOT be able to make a 10 LED scanner, you could make a 5 LED scanner by hooking pins 3, 2, 4, 7, and 10 to LED's 1, 2, 3, 4, and 5 respectively, then hooking pins 1, 5, 6, 9, and 11 to LED's 5, 4, 3, 2, and 1 respectively. That would create a scanner that will go back and forth on 5 LED's So it would light up LED's 1, 2, 3, 4, 5, 5, 4, 3, 2, 1 and repeat. The LED's on each end will be lit by twice the rate of flash, so if you go with 1 Hz, they will run at .5Hz, if you run the counter at 15Hz, they will run at 7.5Hz, while the other lights (2,3,4) run at 15Hz.

Exactly what I am going to do. Just need a better diagram of exactly how I need to do it, and a parts list.

Lance wrote:

Exactly what I am going to do. Just need a better diagram of exactly how I need to do it, and a parts list.

Here you go,

http://i146.photobucket.com/albums/r269/mx107/5LEDScanner-1.gif

And here are the values for R and C

(each line is a different possibility)

1Hz (once a second)

R = 720k C = 1uF
R = 360k C = 2uF
R = 240k C = 3uF
R = 180k C = 4uF

.5 Hz (once every other second)

R = 1440k C = 1uF
R = 180k C = 8uF
R = 144k C = 10uF
R = 96k C = 15uF

PwrRngr - Please check my numbers on that.

Those numbers to look good and the circuit looks good except one BIG thing. I looked at my data sheets for the 2N3904 transistor and the max Emitter-Base voltage is 6V. Your source voltage is 12V won't work.

So do we know of a transistor that will work at 12V?


Anyways.

Here's a diagram if you wanted for a 6 LED scanner

They will light up in this order LED # 1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1, 2, 3.....

Each LED will only be on for 1 times the Hz....so LED's 1 and 6 will only be on for a second a piece at 1 Hz rather than 2 seconds as in the 5 LED model.

http://i146.photobucket.com/albums/r269/mx107/6LEDScanner.gif

NOTE: The values for R and C will remain the same as mentioned above.

Never mind what I said about the 6V. The collector is connected to the 12V not the base. I just can't follow the lines. DUH!

LOL....you're fine, but isn't the chip putting out 12V too, because it's connected to 12V?

Here's another way to do it.

http://www.talkingelectronics.com/projects/KittScanner/KittScannerP2.html

Explained with a parts list.....I like the one we're doing better, but this one would work.

Excellent. Thanks for all you that are helping out.

I picked the first line on the resistors, the only thing they had closest to it was a 715k, will that still be fine?

Thanks a bunch!

-Lance

I'll guarantee that digikey has whatever you're looking for. I almost always buy my electronic stuff from there.

No problem with the helping thing, that's what the community's here for

as for where to buy.....here you go

http://www.newark.com/jsp/search/productdetail.jsp?SKU=89K0559&CMP=AFC-GB100000001

Froogle FTW

Or as PwrRngr said http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=568-2683-5-ND

Digikey is more than 200% more expensive though

If you buy $25 or more of stuff off Digikey they drop the $5 handling fee. I never have a problem spending $25 on electronics.

I was talking about the actual unit price, I didn't look into shipping/handling charges.

Newark is 24.9 cents and DigiKey is 78 cents

No big deal, I was just making a point. I seriously doubt that he will be spending $25 there. heck you could probably buy 5 of everything he needs for this project for 25 bucks.

On a new note, the 270 ohm resistor will have to be changed right? This digram is using amber LED's, the 270 ohm resistor will have to be changed to match the LED's that are installed right?

And transistors are basically acting like little relays in this diagram right?

For the record, this chip is stable up to 20V max according to Newark (I believe that's where I got that)

Yes, I ordered everything last night, but the 270 resistor will probably need changed. The LEDs I am using are the clear red ones from oznium.

Yeah, the 715k will be fine

If you use a 715k resistor and a 1uF capacitor you'll get 1.007 Hz

If you use a 715k resistor and a 2uF capacitor you'll get .5035 Hz


I think those are close enough for what we're doing.

The 270ohm resistor will need to be changed to a 560ohm (According to Oznium store page for the Red 3 and 5mm LED's)

Here's the updated Diagram for the post above

http://i146.photobucket.com/albums/r269/mx107/6LEDScanner_oz.gif

Updated Diagram with Less transistors to wire in




I took out the other Diagrams and turned them into links to let the page load faster and make it less cumbersome and confusing. They're still there, just click on the links.

Thanks a bunch.

And yes, Digikey is bad about the 5 bucks handling and 8 shipping, but that is life.

I am making 2 of these anyways.

Gonna finish the order later on.

Also, different size blue resistor now?

Thanks again!

You can model this all on SPICE. It's a good program. Post pictures/video when you're finished. I'm thinking about doing this for my turn signals (when I can find time); kinda like the sequential tail lights but a bit different.

Yeah, different size blue resistor, because you're using different LED's than was called for in the original design. The Oznium LED's require a different voltage than the ones in the original diagram.

PwrRngr, I have SPICE, but I can't figure out how to use it...I've been editing these in Paint.

Anything else not mentioned need changing? If not, I am going to proceed with my order.

Nope, you can do it exactly like the diagram above, I would get 15-17 of the transistors, they are easy to burn up if you aren't good at soldering. That way you have a few to burn up before you get to where you start running out.

Here's a tip, if you're soldering them to a circuit board, place an alligator clip between the board and the transistor to act as a heat sink, that way the heat can't damage the component.

Alrighty, just has to be the most expensive of the pieces too xD.

Thanks.

are they really? I wouldn't have guessed that... Just make sure you're careful, solder quickly with as little heat as possible, and use some sort of heat sink between where you're soldering and the transistor itself...

.50 each, I am ordering 18 so its 9 bucks lol. Anyways, thanks for your help.

I will keep the tip for soldering in mind too!

lol, you're welcome.... Let me know if you need any more help.