Subj : Re: Pi-FAN for RPi4 with 4 (instead of 3) cables?
To   : Pancho
From : The Natural Philosopher
Date : Sat Dec 07 2024 14:50:54

On 07/12/2024 12:31, Pancho wrote:
> On 12/7/24 11:54, The Natural Philosopher wrote:
>> On 06/12/2024 14:53, s|b wrote:
>>> On Thu, 5 Dec 2024 07:48:59 +0000, The Natural Philosopher wrote:
>>>
>>>>> Tnx for the follow-up. According to the shop I could just snip the
>>>>> green
>>>>> wire, so I've done that. I've set it to run at 60°C and the fan's not
>>>>> turning (CPU temperature is 48°C).
>>>> My Pi 4B runs about that with no fan
>>>
>>> That's what I'm saying: it's 48°C when the fan is not running. Software
>>> only allows to set a minimum temperature of 60°C before the fan starts
>>> running, so I unchecked the setting and now the fan is turning all the
>>> time. A fan with only 2 cables (red & black) should have been enough. I
>>> don't know if there's a way to set that minimum temperature to 40°C...
>>>
>>> But yes, it's not really necessary and  I shouldn't have bought it. But
>>> it was fun setting it up. I use RPi4 for Pi-Hole and PiVPN. I've played
>>> a little with RetroPie, so maybe I'll give that another go, because I
>>> have two RPi4 now.
>>>
>>> I used a Pimoroni Heatsink Case for the first one I bought:
>>> <https://shop.pimoroni.com/products/aluminium-heatsink-case-for-
>>> raspberry-pi-4?variant=29430673178707>
>>>
>>> Temperature is around 40°C.
>>>
>>> The Unity V2 comes with a fan:
>>> <https://www.kiwi-electronics.com/en/unity-v2-case-for-rpi-4-20096?
>>> search=unity>
>>>
>>> Temperature is between 30° and 35°C. (There's a real peak when I open
>>> Fx.)
>>>
>>
>> It's an interesting thought as to why one would use a fan at all. If
>> its such a high compute task that you need one, maybe a bigger Pi or
>> an Intel based machine is indicated.
>>
>
> Heat is often about continuous utilisation, like CCTV. On my Pi4 I have
> a heavy aluminium case that serves as a heat sink, it is fine without a
> fan.
>
> On my Pi5, I use the official active cooler heat sink, which has a fan.
> But a good fan, in that it only comes on during the hottest days of summer.
>
> In a moment of stupidity I also bought a metal case for the Pi5 which
> messes up my USB keyboard/mouse dongle (reflection?), I haven't checked
> to see what it does to Bluetooth and WiFi.
>
>> I dislike fans. They fail.
>>
> They do, but they normally last for years.
>

Not IME

Repaired several computers with failed fans. If you were lucky the fan
itself just needed replacing, If you were unlucky it took the processor
with it.

The trouble is the environment in which they run. In a clean machine
room, OK. In an office full of people some of whom must have had pets
and some of whom smoked, it could be  a very common failure...


--
There’s a mighty big difference between good, sound reasons and reasons
that sound good.

Burton Hillis (William Vaughn, American columnist)

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