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How to make a LED pulse??

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MrSelfDestruct

Member
Joined
Aug 29, 2002
Location
in my chair
I was looking around on the internet a few days ago and saw a new mac that had a cool feature. When it would go into sleep mode, the power led would pulse, supposedly so it would like like it was "breathing". Anyways I thought it would be neat to do this, but just have the led pulse all the time. I did a little research, but I don't know how this would be done. Anyone have any ideas? Thanks in advance!
 

KILLorBE

Member
Joined
Mar 28, 2001
Location
The Netherlands
If you tell me how fast it needs to pulse I'll see what I can do (It might take a while as I don't have much time on my hands right now).

You could also get a blinking LED from radioshack ($1.79 for a 600mcd Green LED, and $1.29 for a Green or Red ~300mcd LED).

BTW: what kinda LED do you wanna use? (Blue, Red, Green....Ultra Bright....etc).
 
OP
M

MrSelfDestruct

Member
Joined
Aug 29, 2002
Location
in my chair
THANKS

Hey guys thanks for the answers! Thanks for the link KILLorBE, and I would probably want to use a blue or purple (UV??) led and would want it to pulse rather slowly....
 

Veland

Member
Joined
Aug 13, 2001
Location
Bergen, Norway
The bit-tech throbber isn't too complicated to build. I got it right the first way round and has 4 CC's slowly fading in and out. A nice effect.. The only downside is the throbbing speed control which is too coarse. Turn it too far and it's a strobe, try to reduce and it fades over a couple of seconds.. Can probably be tuned if you know more electronics..
 

Turbokeu

Member
Joined
Jul 20, 2001
Location
Brussels - Belgium
Mikey7 said:
do you think that pulser kit can be hooked up to the LED's on the acrylic fans?
Yes it can if you mod the fans to have a separate wire for powering the leds.

I did it to my four Antec blue led fans.
I have pictures of the mod on my homepage (http://www.turbokeu.com) but I did not have the time yet to add the comments...

CD :)
 

Temo Vryce

Member
Joined
Sep 24, 2001
My suggestion would be to make yourself a 555 timer circuit and connect the LED to it via a Relay. You could control the speed of the blinking by using a variable resistor (Pot.). I hope that this idea helps you out some how.
 

Turando

Member
Joined
Aug 31, 2002
Location
UK
would also suggest a 555 timer, but... to really have it your own way you would wanna write yourown code, but can easily be done without;)