# My Rpi-4 with argon one fan hat ...fan mod

**URL:** <https://forum.core-electronics.com.au/t/my-rpi-4-with-argon-one-fan-hat-fan-mod/8917>\
**Category:** Raspberry Pi\
**Created:** [4 December 2020 20:26 UTC](https://forum.core-electronics.com.au/t/my-rpi-4-with-argon-one-fan-hat-fan-mod/8917 "2020-12-04T20:26:01Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![brian86770](https://avatars.discourse-cdn.com/v4/letter/b/c5a1d2/32.png) [@brian86770](https://forum.core-electronics.com.au/u/brian86770)\
**Post date:** [4 December 2020 20:26 UTC](https://forum.core-electronics.com.au/t/my-rpi-4-with-argon-one-fan-hat-fan-mod/8917/1 "2020-12-04T20:26:01Z")

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![IMG20201204154220](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/7/77477331cf7e1a46fa1824239a9bf82ca7410069.jpeg)

speaks for itself really .  
my CPU run`s 10-15 % cooler depending on ambient room temp`s.  
i hard wired it by cutting the cable length by 2/3rds and omitting the yellow wire.  
it still works under the trip temp modes but try it for your self…so much quieter.  
take note of the polarity before soldering…i could not find a correct connector to match on hand so i soldered them to the underside of the board.did not want to hack the original fan…

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**Author:** ![Liam](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/liam/32/3562_2.png) [@Liam](https://forum.core-electronics.com.au/u/Liam)\
**Post date:** [8 December 2020 05:52 UTC](https://forum.core-electronics.com.au/t/my-rpi-4-with-argon-one-fan-hat-fan-mod/8917/2 "2020-12-08T05:52:04Z")

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super neat!

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**Author:** ![brian86770](https://avatars.discourse-cdn.com/v4/letter/b/c5a1d2/32.png) [@brian86770](https://forum.core-electronics.com.au/u/brian86770)\
**Post date:** [2 January 2021 23:42 UTC](https://forum.core-electronics.com.au/t/my-rpi-4-with-argon-one-fan-hat-fan-mod/8917/3 "2021-01-02T23:42:20Z")

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wish some body could write me some code and using a gpio pin attach the yellow i`m ASSUMING ITS A TACHO LINE OUT OR PWM OUT SO I COULD see it VIA A TERMINAL THAT I COULD JUST OPEN AND TYPE TACHO AND SEE IT IN SYNTAX WOLD BE GREAT…sorry capps …as well as it keeps real time output …um refresh i think is the correct term…i dont have the fan box any more

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**Author:** ![Oliver](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/oliver/32/3315_2.png) [@Oliver](https://forum.core-electronics.com.au/u/Oliver)\
**Post date:** [11 January 2021 05:56 UTC](https://forum.core-electronics.com.au/t/my-rpi-4-with-argon-one-fan-hat-fan-mod/8917/4 "2021-01-11T05:56:39Z")

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Hey Brian,

This superuser post is quite informative. If you’ve got a scope I’d suggest hooking it up to the signal wire to see what output you get. According to the below you should get 2 pulses per revolution, allowing you to determine the fan speed.

> <https://superuser.com/questions/1126136/three-wire-and-four-wire-cpu-fans-whats-the-difference>

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**Author:** ![brian86770](https://avatars.discourse-cdn.com/v4/letter/b/c5a1d2/32.png) [@brian86770](https://forum.core-electronics.com.au/u/brian86770)\
**Post date:** [12 January 2021 12:11 UTC](https://forum.core-electronics.com.au/t/my-rpi-4-with-argon-one-fan-hat-fan-mod/8917/5 "2021-01-12T12:11:10Z")

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then i will just hook it to my counter and half what i see on the readout …i think that should work if its 2 pulse per second…??