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 Post subject: Cna y fade them?
PostPosted: 20.06.2002 08:23 
I was looking at your schema for the 10 led sequence and I have one question, caan you fade each led. I know I could use your color fade circut to fade one led on and off, If I connnected the output of the the sequencer to the input of 10 separate fade circuits I could easily fade them, but that is a big waste of circut board. Can I place the fader between the 555 and the 4017? and will that work to fade the output?


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PostPosted: 20.06.2002 11:19 
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Nope, you can't do that. That signal which is going from 555 to 4017 is digital signal that has to be 0 volts or 5 volts. When 5 volts is given the 4017 will do one step. if you don't give 5 volts it doesn't know what to do. I don't know if there is any cheap way of doing this but maybe you could use samesort of capasitor circuit for each led to delay the full brightness and give some fading when it's turning the led of.


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PostPosted: 24.06.2002 21:31 
cool thanks, Macroman just finished a knight rider light over at but, I can use that. Not as much materials, still lots, but not as much.


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 Post subject:
PostPosted: 03.07.2002 20:24 
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I was about to ask the same thing just to see if it was a possible workaround for the fading knightrider LED circuit. Good thing I found this post.


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 Post subject:
PostPosted: 21.09.2002 18:19 
Wher can I find a fading knoght rider scheme?


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 Post subject:
PostPosted: 21.09.2002 19:01 
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This could be done with PIC chips, they could be programmed so they would have a timer in it and some code to fade the leds...
And it could be funny to code the chip like that it would change the animation by pressing one button, and when you don't need the led animation anymore, you just program the chip again to do some other job...

Not maybe the easiest way to do it, but if somebody would try it, it would be nice (somebody who knows how to do it...)

I don't know much about PIC programming, but I thought that I could start learning it...... :?

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PostPosted: 21.09.2002 23:41 
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I've used pic in few of my projects before but I've decided not to add those to Metku. I just feel that they are bit too difficult for most of the modders.... well, maybe I could make a multipart article where we first build the programmer and then make some simple things with it... not a bad idea actually... what do you think, should I do it?


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PostPosted: 22.09.2002 07:42 
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yea go for it ...good way to get some of the more advanced people involved

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PostPosted: 22.09.2002 12:06 
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Yeah, do it, I have to build a PIC programmer to myself also... :?

With those chips you could make much more cooler led animations, etc...

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 Post subject: Re: Cna y fade them?
PostPosted: 22.08.2008 09:24 
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Wouldn't it be possible to just put a cap in parallel with each LED (like in http://metku.net/index.html?path=mods/h ... /index_eng)?


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 Post subject: Re: Cna y fade them?
PostPosted: 22.08.2008 11:41 
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As you can see from the schematic of that HDD Led, you need to have a transistor there too. Capacitor can't store that much power that it could fade the led alone. Instead we discharge it via the transistor's base leg and this gives a longer "fade out".


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