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Motherboard header not compatible with Barrow temperature sensor?

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post #11 of 20 (permalink) Old 09-09-2019, 03:47 PM - Thread Starter
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Quote: Originally Posted by looniam View Post
the 3 pin should work on a 4 pin header since all standard headers have 1)ground 2)12v 3)sense 4)pwn control. the 3 pin ignores/doesn't use pwm control.
this show how the "clip" lines up for the difference comparing a 3 to 4 pin header:
Attachment 294392

i don't think gigabyte would break standards as that would cause issues with all fans.
Yeah, I think the 4-pin is compatible with 3-pin voltage controlled fans. However, I think this temperature sensor has just 1.) 5V and 3.) ground. I'm not knowledgeable enough to know, but I've never seen a connector like this. I've been looking to see if this is a standard connector, since if they make an adapter I could probably power it off of molex.

Here's the image from Barrow's website that I'm basing this off of:

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So it looks like I'm out of luck unless I remove the existing connector and use a standard 3-pin connector or if I get the Barrow controller. Regardless, thanks for the help everyone! I hope this helps others who are interested in grabbing one of these sensors.

Last edited by annul; 09-09-2019 at 03:56 PM.
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post #12 of 20 (permalink) Old 09-09-2019, 06:01 PM
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are you sure about that 5v?

here is a vid showing it using 12v only w/molex adapter:



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oh fudge, i just realized that red wire IS 5v. but i have no idea where those are at.

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post #13 of 20 (permalink) Old 09-09-2019, 07:47 PM
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That guy in the video just used a custom molex adapter to get the 5v. it seems like it just needs a straight DC 5v supply and the simple solution is get that via a molex adapter.




Fan headers do not give 5v only 12v hence the molex adapter. ( To use a fan header you need to do some math and work out an appropriate resistor based on current draw or get fancy and whack in a voltage regulator - either way too much effort compared to just pulling 5v from a molex)

Last edited by clannagh; 09-09-2019 at 08:01 PM.
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post #14 of 20 (permalink) Old 09-09-2019, 07:48 PM
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i don't see why you can't re-pin.

I've done this numerous times, n PWM pumps ship like this all the time.

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post #15 of 20 (permalink) Old 09-09-2019, 08:05 PM
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Quote: Originally Posted by annul View Post

So it looks like I'm out of luck unless I remove the existing connector and use a standard 3-pin connector or if I get the Barrow controller. Regardless, thanks for the help everyone! I hope this helps others who are interested in grabbing one of these sensors.
NO DO NOT DO THAT - the device needs 5v. Fan headers, whether 3 pin or 4 pin will give you 12v which likely will burn it out.

You need to get 5v from somewhere and the simplest way is to make up a custom molex adapter.
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post #16 of 20 (permalink) Old 09-09-2019, 08:13 PM
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I had a BARROWCH (not Barrow) temp sensor that looked similar to this. The temp sensor is designed to run off of a fan header, 3 pin or 4 pin.

HOWEVER, the BARROWCH temp sensor needed 12 volts all the time. I burned up two when my BIOS defaulted back to factory and switched the fan header back to 9v.
A direct 12v feed from molex or sata would be safer if you do not have a header that defaults to 100%.

The other fitting is to hook up to the Barrow RGB board. This must be a Barrow specific feature.
Not sure why you need it because I did not see where RGB was used on this sensor. The display is powered and run off the temp sensor body.

Please note that there is no temp output on the temp sensor, only the display is used. Otherwise there would be a 2 pin 10K female end available to hook up to.

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post #17 of 20 (permalink) Old 09-10-2019, 03:39 PM - Thread Starter
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Quote: Originally Posted by clannagh View Post
NO DO NOT DO THAT - the device needs 5v. Fan headers, whether 3 pin or 4 pin will give you 12v which likely will burn it out.

You need to get 5v from somewhere and the simplest way is to make up a custom molex adapter.
The fan headers on my motherboard are "hybrid" PWM headers. According to Gigabyte they can sense the voltage from the device that's plugged in, although I'm not sure how. They don't have information on what it defaults to either, but you're correct that it seems risky to assume. I'd appreciate if anyone can chime in on how these hybrid headers work.


Quote: Originally Posted by Moose-Tech View Post
HOWEVER, the BARROWCH temp sensor needed 12 volts all the time. I burned up two when my BIOS defaulted back to factory and switched the fan header back to 9v.
A direct 12v feed from molex or sata would be safer if you do not have a header that defaults to 100%.

The other fitting is to hook up to the Barrow RGB board. This must be a Barrow specific feature.
Not sure why you need it because I did not see where RGB was used on this sensor. The display is powered and run off the temp sensor body.
A closer look at the Formulamod and Barrow product page for the DK301 controller reveals that this specific temperature sensor requires 5V DC. It seems like this is a fairly new product and one that they've made to integrate specifically with their controller, unlike the previous FBFT02-V2 that could be plugged in straight to a fan header.
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post #18 of 20 (permalink) Old 09-10-2019, 04:35 PM
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Quote: Originally Posted by annul View Post
The fan headers on my motherboard are "hybrid" PWM headers. According to Gigabyte they can sense the voltage from the device that's plugged in, although I'm not sure how. They don't have information on what it defaults to either, but you're correct that it seems risky to assume. I'd appreciate if anyone can chime in on how these hybrid headers work.
Pretty sure a hybrid fan header just means it can flip between PWM speed control or variable voltage speed control.

I very much doubt it can auto-sense a device that needs 5v and automatically reduce the voltage to a safe level, that seems highly unlikely.

Forget the fan headers and just get a 5v supply to the device. Rig up a molex adapter or even run it off dry cell batteries if need be.
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post #19 of 20 (permalink) Old 09-10-2019, 04:38 PM
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I would go the molex connector route mentioned previously ... or a SATA power connector since you can get 5V there. Obviously, a USB header will also have a solid 5V. The hybrid fan headers allow both PWM control or voltage control. So you COULD set the header to analog voltage control mode and fix it at 40% to get 5V. But ... if that config ever gets overwritten you'll end up with 12V and probably burn out the temp unit. I would say they did a really poor job of getting their temp display connected to an available power source in the PC. If you connected it up to pins 1 and 3 of one of your fan headers, you probably didn't do any harm to it. But if you connected it to pins 1 and 2, you may have hit it with 12V and it may not be coming back from that.
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post #20 of 20 (permalink) Old 09-15-2019, 05:58 PM - Thread Starter
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I thought I'd post a final update on this. I ended up getting the Barrow ARSKZQ 5V controller and was able to supply power to the sensor. Hopefully this helps anyone out there who was wondering how to power one of these. I have to say I'm glad with how it turned out and it makes a good companion to the Barrow flow sensor.

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