Posts: 11
Joined: Tue Sep 24, 2019 7:22 pm

Pi4: Are HATs practical anymore?

Tue Sep 24, 2019 7:29 pm

With the overheating issues, it is practical any longer to cover the Pi 4 with another board that prevents airflow?
If not, what is the long-term solution?
Will a side-mounted fan become available to push air across the Pi rather than up and away?
Should people who have HATs simply underclock the CPU and if so, what is the ideal frequency?

W. H. Heydt
Posts: 14096
Joined: Fri Mar 09, 2012 7:36 pm
Location: Vallejo, CA (US)

Re: Pi4: Are HATs practical anymore?

Tue Sep 24, 2019 8:27 pm

PoE HAT has a fan, so it would not only work, but be beneficial.

My biggest problem is that I'm going to have several P4Bs that need RTCs. Most fans grab both 5v pins...as do the RTCs. I'm going to run some tests with fans attached to 3.3v pins and see how that works.

Posts: 2789
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Pi4: Are HATs practical anymore?

Tue Sep 24, 2019 8:57 pm

My RTC boards are mounted to Proto Hats. https://www.adafruit.com/product/2310
With a stacking header I can then mount another Hat on top of them. https://www.adafruit.com/product/1979
Not 100% sure what I'm going to do Pi 4 Wise though.
My fan shim is currently soldered to a header. I could plug a Hat in on top of it. I just mounted the fan under its holder instead of on top of it to lower it back down.
Another option is something like this, https://shop.pimoroni.com/products/mini ... 48026055
Or this, https://shop.pimoroni.com/products/pha ... 973360138

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Re: Pi4: Are HATs practical anymore?

Tue Sep 24, 2019 9:15 pm

My solution to the problem is to get another power source for the fan
sample image below:
Extend_headers.jpg (209.9 KiB) Viewed 324 times
and the HAT plugs into the extended headers:
RPiDesktopSetups.jpg (195.4 KiB) Viewed 324 times
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