LED Controller.

Kurt_ · Post by **Kurt_** » Wed Mar 21, 2007 1:40 pm

I figure this is pretty simple. I want something that applies voltage to LED's in such a way that they fade on and off. Picture a voltage vs. time char with sine and cosine.

As well, something that alternates LED's on and off with no fade.

G-force · Post by **G-force** » Wed Mar 21, 2007 3:10 pm

http://metku.net/index.html?path=mods/h ... /index_eng

Gotta love metku.

Kurt_ · Post by **Kurt_** » Wed Mar 21, 2007 4:28 pm

That's awesome, simple, and virtually free. But how would I go about doing 2 that are opposite each other?

...nevermind. I now love metku.
http://metku.net/colorfade/index_eng.html

Out of the 2 free samples here, which one should I get?
http://focus.ti.com/docs/prod/folders/p ... ml#samples

Haku · Post by **Haku** » Wed Mar 21, 2007 6:19 pm

Can anyone access that site? I looked through some of the pages using www.archive.org 's copy and it looked interesting but I can't access it direct.

gamemasterAS · Post by **gamemasterAS** » Wed Mar 21, 2007 6:23 pm

I just accessed it direct.

Kurt_ · Post by **Kurt_** » Wed Mar 21, 2007 6:24 pm

I just ordered the first one.

Haku · Post by **Haku** » Wed Mar 21, 2007 6:34 pm

gamemasterAS wrote:I just accessed it direct.

I think something's up with my ISP's DNS, can't even traceroute metku.net, oh well I'm being forced to a new ISP soon as they're kicking me off for over-using an ADSL service advertised as unlimited

timmeh87 · Post by **timmeh87** » Wed Mar 21, 2007 10:19 pm

Using all these fancy opamp circuits to control the brightness of leds seems pretty silly to me when I have a bunch of microcontrollers already sitting around. modulating the voltage like that is technically not as precise as using PWM anyways. And you could come up with many more complicated things than just blinking.

Felino · Post by **Felino** » Wed Mar 21, 2007 11:44 pm

Ok first, lets not get hasty.

LEDs do not like their current and voltage shanged at all. PWM is the way to mo, this is like a motor, you don't alter the voltage / current, you send pulses to them from a PWM or the like.

One guy once made this great little mood lamp, it used 12 LEDS, 4 each of read, green and blue, and made this wonderful colour changing mood lamp. This is a great start for somone to LED PWM. I have built somthing of the like once.

Beore I go there is one thing I learnt in hgihschool electronics. Apply 12 volt, 10 - 15 amp through and led, they don't blow up. They explode, the blow into little pieces, looks cool as.

Be carefull though.

Felino

P.S. http://tobe.nimio.info/rgb_mood_light.php