dome light fade in/out

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132044
Printed Date: April 25, 2024 at 4:31 AM

Topic: dome light fade in/out

Posted By: minitruckin
Subject: dome light fade in/out
Date Posted: August 21, 2012 at 12:02 PM

i really like how my full size truck has dome lights that fade in and out and I would like to do this in my mini truck. I have found the diagram to fade out but nothing to fade in. Any Help?

Replies:

Posted By: oldspark
Date Posted: August 21, 2012 at 4:02 PM

The short answer - apart from commercial offerings - is to use a PICAXE eg, the PIC 08 (or 08M or 08M2), and program it.

Posted By: hotwaterwizard
Date Posted: August 22, 2012 at 10:20 PM

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: August 22, 2012 at 10:34 PM

https://www.whatcircuits.com/light-control-circuits/in-car-lights-with-fade-in-fade-out-effects/

This circuit is simple to build.

The circuit will operate as a nice fade-in fade-out visual effects when switching your in-car lights on and off.

The fading time can be changed by adjusting the charging and discharging times of the capacitor.

To do this, adjust the values of the 10 KOhm and 4.7 MOhm resistors.

BUZ74 is a SIPMOS power transistor (Siemens MOSFET) that can handle up to 500V.

Instead of BUZ74, you can use any other power MOSFET that has a VDS value greater than 50V.

posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: minitruckin
Date Posted: August 23, 2012 at 11:39 PM

ok i guess i need to mention i dont know that much about electrical diagrams (or lingo) to comprehend what you are trying to tell me. I do appreciate the assistance, but if you could break it down to little bite size bits so i can follow you, it would be much appreciated. Thank you in advance.

Posted By: hotwaterwizard
Date Posted: August 24, 2012 at 9:31 PM

Sounds Like I should Build the circuit then explain it to you.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: howie ll
Date Posted: August 25, 2012 at 12:34 AM

HWW, sell not explain, you and Oldie both fell into that one posted_image

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: rizallionc
Date Posted: September 10, 2012 at 10:53 PM

hotwaterwizard wrote:

Sounds Like I should Build the circuit then explain it to you.

I want one! How much?

Posted By: oldspark
Date Posted: September 14, 2012 at 11:47 PM

My compliments Hotwaterwizard - that's a bluddy good circuit!
Not that I've tried it, but it is certainly simpler than other discrete circuits I have seen or envisaged.

However most inquiries I have seen have been for LEDs (or a mixture of LEDs and bulbs) in which case PWM is the only practical solution, and hence my PICAXE suggestion where a $5 PICAXE 08 plus its 2 programming resistors, input resistors etc, 5V regulator, output MOSFET (or transistor) and "simple" programming can do any dimming rate with whatever delays and trigger(s).

But I reckon one day I'll build that circuit, though I'll probably add an input resistor (1k?) to limit input current if using a grounded switch that feeds some other +12V circuit or load.