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UCM Pi - Upgrade to CM4S ?
#1
Wondering if anyone else has done this .. before I spend some £. 

I'd like to run HA on a Pi CM4S which is pin compatible with a CM3/3+. Can get 4G RAM / 16G EMMC , which will run HAOS comfortably.
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#2
I have not tried the CM4 adaptor for CM3 but I supose it should work

We are about to introduce the neww UCMA/Pi with CM4 which is run on Home Assistant instead oof Node Red, and will be fully supported by Cytech, see photo below. More details soon


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#3
(04-19-2026, 06:07 PM)srooks Wrote: Wondering if anyone else has done this .. before I spend some £. 

I'd like to run HA on a Pi CM4S which is pin compatible with a CM3/3+. Can get 4G RAM / 16G EMMC , which will run HAOS comfortably.

I used the Waveshare adapter to upgrade to a CM4, worked perfectly. However, I could barely see any difference in performance. If you are running out of memory on the CM3, then it's worth it. Also, you may have problems loading the AlphaWerk software as it is seriously out of date. I have reworked it and it runs Node-RED 4.1 and the latest 64 bit version of Raspbian.

And before you ask,the CM5 does not work, I tried!
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#4
slychiu .. interesting ! 

Think I'll have to wait and see the cost. 

Can we reuse any of the UCMpi hardware , or is it all new ? Existing hardware was quite expensive :-(

(04-20-2026, 08:10 AM)Sota Wrote:
(04-19-2026, 06:07 PM)srooks Wrote: Wondering if anyone else has done this .. before I spend some £. 

I'd like to run HA on a Pi CM4S which is pin compatible with a CM3/3+. Can get 4G RAM / 16G EMMC , which will run HAOS comfortably.

I used the Waveshare adapter to upgrade to a CM4, worked perfectly. However, I could barely see any difference in performance. If you are running out of memory on the CM3, then it's worth it. Also, you may have problems loading the AlphaWerk software as it is seriously out of date. I have reworked it and it runs Node-RED 4.1 and the latest 64 bit version of Raspbian.

And before you ask,the CM5 does not work, I tried!

Thanks for info. HA seems to need 2GB RAM (based on my pi5). 
I was thinking of forking Comfort2MQTT to support the UCMpi serial port and running this as an add-on in HA. Let's see :-)
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