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Windows 7: LED Dimming and Brightening

29 May 2010   #11
Lordbob75

Windows 7 Ultimate x64, Mint 9
 
 

Quote   Quote: Originally Posted by kodi View Post
One wire from PSU to Pot to fan
Another wire from PSU to Resistor to led
That would not dim it at all though...

~Lordbob


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29 May 2010   #12
kodi

Windows 10 Pro x64
 
 

Sorry must have been another "Seniors moment" I will have to read the original post more carefully before i try to help.
I thought you wanted the LED's to stay fully on and not dimmed.
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29 May 2010   #13
Lordbob75

Windows 7 Ultimate x64, Mint 9
 
 

Quote   Quote: Originally Posted by kodi View Post
Sorry must have been another "Seniors moment" I will have to read the original post more carefully before i try to help.
I thought you wanted the LED's to stay fully on and not dimmed.
It's alright.

I want the LED to dim when I turn the fan down, and brighten when I turn it up.

~Lordbob
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29 May 2010   #14
WindowsStar

Windows 7 Enterprise (x64); Windows Server 2008 R2 (x64)
 
 

Again the simplest way to do this is to buy a small red or blue incandescent bulb to get the effect you are looking for. Very simple the bulb will work just like the fan does using the POT. Unless someone takes it apart you will never know it is not an LED.
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29 May 2010   #15
kodi

Windows 10 Pro x64
 
 

I have just done a quick Google search and have found out that red LED's require a lot less voltage than other colors you may not be getting it to dim because there is still enough power to light it fully.
If blue is an option i would try it
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29 May 2010   #16
archie123

Win 10 Home Premium 64 Bit
 
 

you do have the resistor connected in series dont you? it wont work otherwise , well it kind of will but you wont notice.
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29 May 2010   #17
WindowsStar

Windows 7 Enterprise (x64); Windows Server 2008 R2 (x64)
 
 

Looks like if you use Highly Efficient LEDs and a circuit board you can dim some LED(s).

Check this out: Highly Efficient 0-100% LED Dimmer

or


Attached Images
LED Dimming and Brightening-led-dimmer-circuit.gif 
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29 May 2010   #18
Lordbob75

Windows 7 Ultimate x64, Mint 9
 
 

Thanks Windowstar. Not sure I can figure that out on my own, or what. I will talk to my dad about it tomorrow and see what he says. I may just leave it with a regular LED (no dimming) because the knob has an arrow on it.

~Lordbob
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29 May 2010   #19
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1
 
 

Quote   Quote: Originally Posted by WindowsStar View Post
If you are talking about LED back lighting on LCD TVs they don't dim them.
No, was more an offhand remark. But LED's can be dimmed.

I do believe it has to do with getting the voltage down far enough to allow the led to dim. Perhaps experiment with more resistance until you find the correct amount to allow a dim LED at lowest fan setting (or lowest you will actually turn it down to, lest higher than complete lowest again gives you a bright LED), and brightning at the full brightness voltage. It may well be that the voltage difference between dim, and full bright may be too small a difference for you. A Guy

Did some googling:

http://www.mikesflightdeck.com/led_dimmer.htm

Starts getting into building a circuit, and finding the right parts.
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29 May 2010   #20
archie123

Win 10 Home Premium 64 Bit
 
 

ill ask again just incase.........do you have the led conneted in series with the variable resistor? if you dont it wont work because of the way leds handle voltage and current

just incase your wondering why im spouting all this nonsence ive been an electrical engineer for 20 years and have dabbled quite alot in electronics
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 LED Dimming and Brightening




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