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LED Lighting Mod Idea

post #1 of 7
Thread Starter 
I am working on a PC build now, and wondering if there is a way to install some lighting in my case that would come on based on the temps or fan speed of my CPU? I plan on putting together a low profile, and very quiet build, but I would like to set it up to have some LED's kick in for some underglow in my case when the CPU's temp or fan speed for the cooler is increased under a heavier load.

Any ideas?

My plans for the build include the following:
Motherboard: Asus Maximus VI Gene LGA 1150
CPU: Intel i7 Haswell 4770k LGA 1150
CPU Cooler: Corsair Hydro Series H80i Closed Loop Water Cooler w/ Noctua NF-F12 PWM 120mm Fans in Push/Pull
RAM: Corsair Dominator Platinum 16GB(2x8GB) DDR3 1600
GPU: Asus Geforce GTX 780
Sound Card: Asus Xonar STX 7.1 Sound Card
Case: Silverstone FT03B Black
PSU: Corsair AX860i Power Supply
Storage: Samsung 840 500GB SSD
post #2 of 7
    If you're familiar with simple electronics (soldering, schematics), yes; I have plenty of ideas for you.
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by Techie007 View Post

    If you're familiar with simple electronics (soldering, schematics), yes; I have plenty of ideas for you.

I am pretty comfortable soldering, so if you have some ideas please throw them my way! thumb.gif
post #4 of 7
    Do you want the LEDs to "pop on" at a certain temperature, or would you like their intensity to vary with the heat/load? (even when fading, they could be configured to be off at say, 120°F).  I would use an op-amp for the former and a transistor for the latter.  Please be advised that the response time may be several seconds, due to the time it takes for the heatsink to warm up/cool down.

    One way to detect the CPU temperature is to get a thermistor and attach it to the CPU's heatsink.  However, if the motherboard (or some external speed controller) is controlling the CPU fan's speed (i.e. not a smart fan; but a regular fan being smartly controlled), you could find out whether they are controlling the positive or negative side of the fan's power and we could use that signal to determine the temperature instead.
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Intel Core i7-3770K Gigabyte P67A-D3-B3 NVIDIA GeForce 8400 GS  1x Corsair 8 GB 
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Kingston SV300S3 WesternDigital WD10EZEX Samsung HD154UI Windows 7 Ultimate SP1 x64 
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Daewoo L947BK Gateway FPD1530 HTK-2001 Dynex DX-400WPS 
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Hard DriveHard DriveHard DriveOS
Kingston SV300S3 WesternDigital WD10EZEX Samsung HD154UI Windows 7 Ultimate SP1 x64 
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Daewoo L947BK Gateway FPD1530 HTK-2001 Dynex DX-400WPS 
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post #5 of 7
Thread Starter 
I was planning on using Corsair link to control my case, cpu, and psu fans. I am more interested in just simply having the lights come on once a certain temperature/fan speed is achieved, and having them cut off once is falls back under that threshold.
post #6 of 7
    This first schematic uses a thermistor to detect the temperature.  The op-amp is a LM358.  Any general purpose rail-to-rail op-amp should work.  Depending on how much current your LEDs need, you may need to add the optional transistor as shown.  Size R1 to match your thermistor; if you have a 10K thermistor, you would use a 10K resistor, although close is good enough.  For R2, any potentiometer with a value between 100K and 1K should work.  This is your temperature target adjustment.


 
 
    This second schematic takes advantage of the voltage on a fan to detect temperature.  You will need to find out whether your fan controller controls the positive or negative side of the fan.  Use the upper circuit for the former and the lower circuit for the latter.  Again, if your LEDs need more current, add the transistor as shown in the schematic shown above.



    The unmarked resistor that goes from the output of the op-amp to the (+) input controls the hysteresis.  Start with a high value, like 100K.  If the LEDs flash or dim at the transition point, it needs to be made smaller.  If you make it too small, the LEDs will turn on at a high temperature and turn off at a much lower temperature.
    R3 is the current limiting resistor for your LEDs.  I don't know whether your LEDs are 5V, 12V, or directly connected (~2V), so 1K would be a good starting value for R3.  If the LEDs are too dim, decrease it.  If you've gotten all the way to 100 ohms and it's not getting brighter, you probably need to add the transistor.

    I hope that this isn't too complicated! thumb.gif
Edited by Techie007 - 6/22/13 at 7:01am
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Intel Core i7-3770K Gigabyte P67A-D3-B3 NVIDIA GeForce 8400 GS  1x Corsair 8 GB 
Hard DriveHard DriveHard DriveOS
Kingston SV300S3 WesternDigital WD10EZEX Samsung HD154UI Windows 7 Ultimate SP1 x64 
MonitorMonitorKeyboardPower
Daewoo L947BK Gateway FPD1530 HTK-2001 Dynex DX-400WPS 
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Kensington K72400 Realtek ALC889 
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My desktop PC
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Intel Core i7-3770K Gigabyte P67A-D3-B3 NVIDIA GeForce 8400 GS  1x Corsair 8 GB 
Hard DriveHard DriveHard DriveOS
Kingston SV300S3 WesternDigital WD10EZEX Samsung HD154UI Windows 7 Ultimate SP1 x64 
MonitorMonitorKeyboardPower
Daewoo L947BK Gateway FPD1530 HTK-2001 Dynex DX-400WPS 
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Kensington K72400 Realtek ALC889 
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post #7 of 7
Why not use RGB LEDs so they change colour with temperature ? thumb.gif

dunx
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Wee-PC
(17 items)
 
Wee black box
(13 items)
 
Boinc Box
(10 items)
 
CPUMotherboardGraphicsGraphics
i7 - 960 Asus P6T7 WS Revolution with MIPS water blocks. XFX HD 7950 + waterblock Powercolour R9 280X 
RAMHard DriveHard DriveOptical Drive
Crucial Ballistics Tracer 6 x 4Gb 2Tb WD caviar green Crucial M4 64 Gb SSD  Sony NEC DVD  
CoolingOSMonitorPower
Apogee Drive + Allphacool 180mm rad W7 Dell 29" 21:9 IPS monitor Coolermaster 1250W PSU 
CaseAudio
Antec P280 Scythe Kama Bay Speaker 
CPUMotherboardRAMHard Drive
i7-4770K Asus Impact VI HyperX beast 2400MHz 2x 8Gb WD 1Tb caviar black x3 
Hard DriveCoolingOSMonitor
Intel X-25 SSD 80 Gb Corsair H80 W7 Panasonic 32" HDTV 
KeyboardPowerCaseOther
Keysonic wireless Silverstone 450 W SFX PSU Fractal Design Array R2 Griffin Powermate 
CPUMotherboardGraphicsGraphics
i7 870  Asus Maximus III Formula GTX 480  HD 5870 
RAMHard DriveCoolingMonitor
OCZ 4x 2Gb  WD 2TB Green Corsair H70 Dell 17"  
PowerCase
Coolermaster Silent Pro 750W NZXT Panzerbox 
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