Home Assistant Yellow



I'm using Home Assistant and want to go from a virtual machine on my windows server to a dedicated device.

A group makes these and uses their own operating system. The first piece of hardware was the Home Assistant Blue, which was ok, but not really modular and not good with all interfaces.

I ordered the successor, Home Assistant Yellow (used to be call HA Amber). After ordering in July 2022 and promised in August, I got mine in November.

This uses the new Raspberry PI CM4 which is a stripped down RPI but with bus connectors to expand ports, so you buy a CM4 and plug it into the HA Yellow.








About the CM4

With all the shortages, it took a while to find a CM4 module, mine is a CM4002016. This is a 2 gig ram, 16 gig eMMC unit without wifi.

Here's a datasheet on the CM4:  https://datasheets.raspberrypi.com/cm4/cm4-product-brief.pdf

the part number decodes major features: CM4xyyzzz

    •  x = 0 no wifi
    • x = 1 wifi on board
    •  yy = ram in gigs
    •  zzz = eMMC memory in gigs

The SM4 for HA Yellow

The HA yellow has on board wifi, so you don't want a CM4 with wifi. Also while you can get a CM4 without eMMC, and boot from the HA yellow board, it's apparently a lot easier to have a CM4 with the onboard eMMC

You can buy various configurations of HA Yellow, a kit, the board without the CM4, and a full unit, assembled with a CM4. This last configuration ships with 2 gig ram and 16 GB eMMC, no wifi CM4

Getting started with Yellow

OK, it arrived. I resisted installing the RPI and plugging it in.

Starting to look for installation walkthroughs, here's what I found:



But the system never started to load from the USB memory stick, red and green LEDs on solid and never change.

Tried 2 different memory sticks, no change






OK, next tried the serial console.... Putty finds the UART properly, but no response, means no os..



Next tried option 2 from the next site:


using RPIboot


nothing, the pi is dead.... damn...


So ordered and got another one..... luckily...


did the HA install, used the imager, put on memory stick, powered up, and it seemed to load...


tried the default address: http://homeassistant.local:8123, nothing....

set up the console port, saw lots of good stuff, and got a login: prompt


Add Z-wave

You connect it to the headers, there is only one way to do it. After booting you’re Yellow you can add the Z-Wave integration, and ask to install the Z-Wave JS add-on. After that you need to select the ttyAMA0 port and it should work.






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