dim on dim off circuit?
Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=94344
Printed Date: May 03, 2024 at 7:05 PM
Topic: dim on dim off circuit?
Posted By: compudude86
Subject: dim on dim off circuit?
Date Posted: May 29, 2007 at 3:50 PM
i am putting LEDs in my headlights, and i am trying to figure out how to make a circuit that will dim them on, wait 5 seconds,then dim them off, continuously until the circuit power is cut when the relay is energized by the car coming on. this dimming is similar to a newer iMac or Emac, when it is in sleep mode, if that makes it easier. i only know how to make it dim down using a capacitor, but i dont know how to delay it or dim it up. any advice would be extremely helpful.
Replies:
Posted By: craniumvibratio
Date Posted: May 30, 2007 at 1:52 AM
If you wanted the to blink dei makes a great little module for that It has 5 lights that is triggered by the ground when the alarm is armed. you may be able to use that in some way for your application
hope that helps
Posted By: KPierson
Date Posted: May 30, 2007 at 6:40 AM
You need to do some research in to pulse width modulation. That is the best way to dim LEDs on and off.
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Kevin Pierson
Posted By: compudude86
Date Posted: June 06, 2007 at 12:03 PM
ok, so i thought about the pulse width modulation, and ive had trouble figuring out how to do it standalone, without a pc. so i know that if i rig up a capacitor, that the light will dim off as the capacitor drains. but how to make it get gradually brighter when the power comes on is my question....
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