Metku.net

MetkuMods
It is currently 14.11.2018 23:10

All times are UTC + 2 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
PostPosted: 01.12.2004 09:20 
Is it possible to make it just fade on and stay on? And then when the power was removed, it took a second to fade off again.

That'd be so cool!

Any ideas? Thanks!


Top
  
 
 Post subject:
PostPosted: 01.12.2004 09:40 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
This could be easier done with a separate capacitor circuit where the cap would start to charge when the power is applied to the circuit thus giving the led a delay to get the full brightness. After the power is turned off, the cap would slowly discharge via a transistor/resistor thus dimming the led. Idea is basically the same that I used in my latest mod; HDD Eyez

_________________
Metku | AlltheMods | LedCalc | Teknolelu | AndroidCoding
Main Computer: Intel i5, MSI H55M-ED55, 12 Gigabytes of DDR3, 3 Terabytes of HDD, GTX295 and Benq 27"


Top
 Profile  
 
 Post subject:
PostPosted: 01.12.2004 10:17 
Ooh, that's perfect! I hadn't watched the videos for that mod yet.

Two questions, though.

1. Is it possible to make the fade on and the fade off be take the same ammount of time?

2. Can it be done with just a transistor or two instead of that optoisolator?

Thanks a lot!


Top
  
 
 Post subject:
PostPosted: 01.12.2004 10:40 
Offline
Site Admin
Site Admin
User avatar

Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Yes, you can replace the optoisolator with a transistor. Making the led fade with same way (time) up and down is more difficult because the cap doesn't charge and discharge by following the same curve. This maybe possible with two separate caps... Because I haven't done this, I can't give you the schematics for it but just try to see how the resistors and different caps operate together.

It is quite safe to experiment with caps but there are two things that you should remember. Never connect the electrolytic cap "wrong way". This can result to an explosion. Also make sure that the cap voltage is rated two times higher than the supply voltage. It may work great with smaller rating than that with stabile supply voltage but I just wanted to point this thing out.

_________________
Metku | AlltheMods | LedCalc | Teknolelu | AndroidCoding
Main Computer: Intel i5, MSI H55M-ED55, 12 Gigabytes of DDR3, 3 Terabytes of HDD, GTX295 and Benq 27"


Top
 Profile  
 
 Post subject:
PostPosted: 01.12.2004 10:51 
Cool, I'll give it a try.

Thanks for all your help :D


Top
  
 
 Post subject:
PostPosted: 02.01.2005 23:52 
Pystyisitkö kertomaan suomeksi tarkemmin kuinka saada kyseinen kytkentä tehtyä, tarkoitus olisi saada auton sisävalot syttymään hitaasti kun ovet avataan ja sammumaan hitaasti kun ovet suljetaan.

http://www.cs.tut.fi/~kangasm/kovo.htm

tapahtuuko tuossa kytkennässä niin , vai hidastaako tuo pelkästään valojen sammumisen?


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC + 2 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group