Home Assistant Yellow

by Nabu Casa

Take control of your home as never before.

View all updates Oct 20, 2021

Getting Started with Home Assistant Yellow & First Impressions

by Stefan A

For those who backed a Yellow Kit, this update will show you the steps to get your Yellow Kit ready to use with Home Assistant up and running. As we are still working on Amber, these steps might slightly change by the time you receive your Yellow Kit.

The first step is to plug the Raspberry Pi Compute Module 4 (CM4) into the Amber board. Open the enclosure by unscrewing the four thumbscrews at the bottom. Place the Yellow board on a flat surface. Then carefully place the CM4 onto the designated location on the Yellow board. The white Raspberry Pi logo printed on the CM4 needs to face the side of the Yellow board with the ports. Make sure the connectors on the underside are aligned and press firmly on both long edges of the CM4 simultaneously.

The next step will be to place the heat sink. The Yellow Kit ships with two heat pads which help to keep the CM4 cool. Place the heat pads onto the SoC and memory chip as shown in the picture below.

Heat transfer pads assembly

Pre-assemble the heat sink by pressing the pushpins through the two mounting holes on the heat sink. Lastly, align the heat sink with the mounting holes on the Yellow board and press the pushpins through the Yellow board until they snap in place.

Mounted heat sink

With that, assembling the CM4 is finished. Put the Yellow board back into the enclosure and screw the bottom plate back in place using the four thumbscrews.

Lastly, you will need to install Home Assistant on the on-board eMMC. We will publish a simple installer you’ll need to flash onto a USB flash drive. The CM4 boots from a USB flash drive out of the box. You’ll need to prepare the USB flash drive using balenaEtcher or a similar imaging tool. We’ll publish links to the installer once Home Assistant Yellow is available.

Plug the prepared USB flash drive into your Home Assistant Yellow. Make sure to connect Home Assistant Yellow to the internet via Ethernet. This is required since the latest version of Home Assistant OS will be downloaded directly from the internet. Power your device on and wait until the yellow LED turns solid (this process takes 5-10 minutes).

You can now use Home Assistant just like the pre-installed version. Check out our previous update showing Home Assistant running on Home Assistant Yellow.

Note: If you are using a CM4 Lite (without on-board eMMC storage) you’ll need to have an NVMe SSD instead. The installation process is the same; the installer will detect which storage device is present.

If you backed Home Assistant Yellow with the CM4 included, these steps are unnecessary as the CM4 is already pre-installed and loaded with Home Assistant.

First Impressions by Everything Smart Home

About the Author

Stefan A


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Product Choices


Home Assistant Yellow

This flagship version of Home Assistant Yellow is ready to go out of the box. It comes pre-assembled in a custom enclosure with a Raspberry Pi Compute Module 4 (CM4) and a custom heat sink for fanless, silent operation. The CM4 is a version without wireless and has 2 GB RAM and 16 GB eMMC storage, pre-installed with Home Assistant. All you need to get started is to plug in the power supply and the Ethernet cable, both of which are included. This variant does not have Power-over-Ethernet.


Yellow Kit with Power-over-Ethernet

The Home Assistant Yellow mainboard that comes with this kit supports Power-over-Ethernet (PoE). The kit does not include a power supply, though it is safe to operate it with both PoE and a 12 VDC power supply plugged in at the same time, in which case power will be drawn from the 12 VDC supply and not PoE. Custom enclosure, custom heat sink, and Ethernet cable included. You must provide your own Raspberry Pi Compute Module 4 and install Home Assistant on it.


Yellow Kit with Power Supply

Some assembly required! This kit includes everything in the flagship version except the Raspberry Pi Compute Module 4. This option allows you to pick the compute module with the memory and eMMC storage to fit your needs. You will need to install Home Assistant on the compute module you provide. Custom enclosure, custom heat sink, and Ethernet cable included. This version comes with a power supply, but does not support Power-over-Ethernet.


12 VDC 24 W International Wall Mount AC Adapter

From the Crowd Supply Basics project.

In case you want an extra power supply.

An AC adapter with interchangeable plugs provided for the US, EU, AU, UK, plus a CCC-compliant plug. 24 W max (12 V @ 2 A) with a 1.5 m cable and a 2.1 mm center-positive barrel jack.



From the Crowd Supply Basics project.

For booting or expanded storage.

SanDisk NVMe SSDs in various capacities: 128 GB (P/N SDAPMUW-128G-1022), 256 GB (P/N SDBPNPZ-256G), and 512 GB (P/N SDBPNPZ-512G).


Raspberry Pi CM4 (16 GB eMMC, No Wireless, 2 GB RAM)

From the Crowd Supply Basics project.

Perfect for use with a Yellow Kit.

This CM4002016 variant of the Raspberry Pi Compute Module 4 is a System on Module (SoM) containing an ARM quad-core Cortex-A72 processor, 2 GB RAM, 16 GB eMMC flash, supporting power circuitry, and no wireless capability.


Raspberry Pi CM4 (32 GB eMMC, Wireless, 4 GB RAM)

From the Crowd Supply Basics project.

Perfect for use with a Yellow Kit.

This CM4104032 variant of the Raspberry Pi Compute Module 4 is a System on Module (SoM) containing an ARM quad-core Cortex-A72 processor, 4 GB RAM, 2.4 and 5 GHz 802.11b/g/n/ac Wi-Fi and Bluetooth 5.0, 32 GB eMMC flash, and supporting power circuitry.


USB Cable: Type-C to Type-A

From the Crowd Supply Basics project.

Optional - only needed for accessing Home Assistant Yellow's UART and CM4 USB recovery.

A 100 cm cable with a USB Type-C and a USB Type-A connector.


Nabu Casa

Nabu Casa, Inc. has been founded by the creators of the open source project Home Assistant and Home Assistant OS. We provide Home Assistant Cloud, the missing cloud piece for Home Assistant. Our mission is the success of Home Assistant as a whole.

Paulus Schoutsen

Pascal Vizeli

Stefan Agner

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Martin Hjelmare

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Erik Montnemery

Jesse Hills

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