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How can I make an LED scanner? Answered

I've been looking for a detailed schematic for an LED scanner with 5-10 LEDs.  I want to use the least amount of parts possible without a micro controller.

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frollard

Best Answer 7 years ago

I built the 16-stage scanner by bowden's hobby circuits. It worked a charm -- same as you describe. 4 stage hex inverter (performs the up/down flip flop, the 9th bit, as well as the astable oscilator to make the circuit go), 16 stage binary updown counter, and 2x 8-bit binary demultiplexer. sounds complex but SUPER easy: http://www.bowdenshobbycircuits.info/page5.htm#night_r.gif 
It was the brake light of my car :)

Simple version: 6 stage scanner using a 4017 decade counter and a 555 timer, and a few diodes... simple 555-drives-decade-counter circuit, with outputs mixed to make the scanner effect...
Output:
0 1 2 3 4 5 6 7 8 9 (decade output)
1 2 3 4 5 6 5 4 3 2 (hooked to led number)

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lemonie

7 years ago

You haven't said anything about scanning except that you want to do it.
How much money do you have and what do you want to scan?

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Trash_Byteslemonie

Answer 6 years ago

I'd like to make a scanner, I'm working with HP scanners that I've hard glitch'd, but i'd like to get into the coding and creation of my own. As far as money is concerned, I can probably get a grant if the cost start running into the thousands.

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metsfan1938lemonie

Answer 7 years ago

Sorry for for not being clear enough. By scanner i meant "sequencer" or "chaser". Like on the knight rider.

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lemoniemetsfan1938

Answer 7 years ago

Oh right, I perhaps should have got that...
You've got two good answers there anyway, go with them.

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KikiTay

6 years ago

Use THIS!

i've tried making my own and gave up, I spent a lot of money buying those kits on ebay but they are either too complicated or can only power a few LEDs at less than normal brightness. I found this circuit that solved my problems! I bought a few and used them to make LED costumes and many of my RC hobby and robotic projects. Pretty straight forward and easy to install though.

I found a similar one on ledsequencer.com but there's no links to buy it. hope it helps!

here's the link! http://www.specialeffectsmagic.com/12_Channels_LED_SequencerChaser_KT01_EXCLUSIVE/p1014120_4630954.aspx

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jrigvd

7 years ago

i'll give you a schematic in a PDF from a original scanner(in Dutch, srry, maybe you can translate it??)...

then follow the LED numbers like this:

LED6 LED5 LED1 LED4 LED2 LED3

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orksecurity

7 years ago

Should be lots of circuits on the web if you search for "cylon" or "kitt". One obvious solution would be a 16-bit shift register (two 8-bit shift registers chained set up as a loop), ORed "backwards" with one another so bit 0 of one is ored with bit 7 of the other and so on down the line, a clock to drive them, and a button and input wiring which would let you initialize them with only one bit being on. Use output of the ORs for the LEDs.

A bidirectional shift register plus one latch for direction which is set or reset when the top or bottom bit is encountered would also do the job.

Lots of other possibilities.