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Home Assistant Connect AUX-2 - audio and RS-232 module with PoE - Nabu Casa NC-AUX-9758
Home Assistant Connect AUX-2 is a Home Assistant module that connects audio equipment, RS-232 ports, a Z-Wave adapter and a Bluetooth proxy, powered through a single PoE cable.
- CD-quality sound synchronized with other speakers
- Two RS-232 ports and a USB type A port for an adapter
- Power and network over a single PoE cable
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Multifunction module for Home Assistant
Home Assistant Connect AUX-2 is a Nabu Casa module that connects audio equipment, devices with an RS-232 port, a Z-Wave adapter and Bluetooth sensors to Home Assistant. CD-quality sound goes to an amplifier or receiver and plays in sync with speakers in other rooms. The serial ports let you control a TV or receiver, also in standby mode, and the USB type A port accepts a Z-Wave adapter. You power the module and connect it to the network with a single Ethernet cable with PoE, and you configure it in Home Assistant.
- 3.5 mm analog jack or optical S/PDIF audio output
- Two RS-232 ports and a USB type A port for the adapter
- PoE or USB type C power, Ethernet or WiFi network
Home Assistant Connect AUX-2
Botland is an official distributor of Nabu Casa, the creator of Home Assistant. It offers innovative open-source tools for managing a smart home, built around user privacy and full control over devices. Botland carries original Nabu Casa products supporting the Home Assistant ecosystem.
PoE
power and network over a single Ethernet cable
112 dB
signal-to-noise ratio of the audio converter
2 x RS-232
3.5 mm jack serial ports for controlling equipment
48 kHz
16-bit stereo sound quality
AUX-2 next to an amplifier in a stereo setup
Whole-home sound with Music Assistant
The TI PCM5122 audio converter with a 112 dB signal-to-noise ratio plays FLAC, MP3 and WAV files at 16 bit / 48 kHz stereo. Thanks to Music Assistant (Sendspin protocol), the AUX-2 plays in sync with other speakers in your home, so a good-sounding stereo set becomes part of a multiroom system. You can connect it to an amplifier with a 3.5 mm jack cable or an optical cable, although only one of these outputs works at a time.
Equipment control, Z-Wave and Bluetooth
Two RS-232 ports in the form of 3.5 mm jack sockets (with a TX/RX switch) control a TV, AV receiver and other equipment with a serial port, as long as it has an integration in Home Assistant. You can connect an adapter to the USB type A port, such as the Home Assistant Connect ZWA-2, to move your Z-Wave network to a location with better range, or a USB-RS-485 adapter for devices with an RS-485 bus.
The Bluetooth 5 LE antenna works as a proxy: Bluetooth sensors reach Home Assistant through a stable wired network connection.
AUX-2 with the Connect ZWA-2 adapter (sold separately)
Ethernet socket and USB-C port on the back of the housing
Power and network over a single cable
With PoE power (802.3af standard or newer), a single Ethernet cable delivers both power and network, so you can place the module next to an amplifier or an AV cabinet, even if there is no free outlet nearby. You can also power it from USB-C (5 V / 2 A) and connect it to the network via Ethernet or 2.4 GHz WiFi. The module is powered from one source at a time, and according to the manufacturer it draws at most 2 W.
Ready to use or to customize
The heart of the AUX-2 is the ESP32-S3 chip, and the module's firmware is based on ESPHome. Out of the box, the module is ready to work with Home Assistant, and the unlocked bootloader accepts your own firmware. The housing is easy to open, so the AUX-2 also works well as a platform for your own ESPHome projects. The sound is handled by a TI PCM5122 converter.
AUX-2 printed circuit board with antenna and connectors
Is it the right choice for you?
Good choice if:
- you have Home Assistant and want to add an amplifier for music throughout your home
- you control a TV or receiver with a Home Assistant integration through an RS-232 port
- you want to place a Z-Wave adapter or Bluetooth proxy in a better spot in your home
Consider another option if:
- you don't have a Home Assistant system yet: start with Home Assistant Green
- you only need a Z-Wave adapter: choose Home Assistant Connect ZWA-2
Fun fact
A purchase that supports Home Assistant
Nabu Casa was founded in 2018 by the creators and lead developers of Home Assistant to provide the project with stable funding. Profit from sales of devices such as AUX-2 funds the development of Home Assistant, which is now owned by the non-profit Open Home Foundation, which also develops many other open projects.
Frequently asked questions
Does the AUX-2 work without Home Assistant?
No. The module is designed for Home Assistant, and that is where you configure audio, serial ports, Z-Wave and the Bluetooth proxy. Home Assistant version 2026.9 or newer is required.
Do both audio outputs work at the same time?
No. Only one output works at a time: 3.5 mm analog jack or optical S/PDIF. Choose the one that matches the audio input of your amplifier or receiver.
Does AUX-2 play audio over Bluetooth?
No. Bluetooth in AUX-2 serves as a proxy for sensors and smart home devices, and sound comes out only through the 3.5 mm jack output or the optical S/PDIF output.
How do I power the AUX-2 module?
The simplest way is an Ethernet cable with PoE, which delivers power and network at the same time (802.3af standard or newer). You can also power the module from USB type C (5 V / 2 A) and connect it to the network via Ethernet or WiFi.
Can I flash my own firmware?
Yes. AUX-2 runs on ESPHome and has an unlocked bootloader, so it accepts your own firmware. The enclosure is easy to open, and straight out of the box the module is ready to work with Home Assistant.
Package contents
- 1 x Home Assistant Connect AUX-2
- 1 x Quick start guide
- 1 x Leaflet with warranty and safety information
USB type C and Ethernet cables are not included in the set.
Technical specification
| Parameter | Value |
|---|---|
| Manufacturer code | NC-AUX-9758 |
| Chip | ESP32-S3 |
| Audio converter | TI PCM5122, SNR 112 dB |
| Audio output | 3.5 mm jack analog or optical S/PDIF (one at a time) |
| Sound quality | 16 bit / 48 kHz stereo, digital lossless (PCM) |
| Formats | FLAC, MP3, WAV |
| Whole-home audio | synchronization via Music Assistant (Sendspin) |
| Serial ports | 2 x RS-232 3.5 mm jack, TX/RX switch |
| USB type A | Connect ZWA-2 adapter (Z-Wave), USB-RS-485 adapter (sold separately) |
| WiFi | 2.4 GHz, 802.11b/g/n |
| Bluetooth | 5 LE, Bluetooth proxy |
| Ethernet | PoE (802.3af or newer) or Ethernet with USB type C power |
| Power supply | USB type C 5 V DC / 2 A or PoE |
| Power consumption | at most 2 W |
| Software | for Home Assistant, based on ESPHome, unlocked bootloader |
| Enclosure | polycarbonate, white and translucent |
| Operating conditions | indoor use only, 0 °C to 65 °C, non-condensing; in a dry place, away from dust, direct sunlight and heat sources |
| Dimensions | 106 x 63 x 25 mm |
| Weight | 104 g |
| Name | Value |
|---|---|
| Smart Home | Universal Binary Sensor |
| Communication |
|
| Width | 11 cm |
| Height | 2.8 cm |
| Depth | 7.2 cm |
| Weight | 0.136 kg |
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30 days to return, without giving a reason
If the product does not meet your expectations, you have 30 days from receiving the parcel to withdraw from the contract. The product only has to be complete. The right of return belongs to consumers (a purchase unrelated to business activity).
Complaints
If the product turns out to be faulty, you can make a claim under the guarantee or the statutory warranty. We handle claims without delay, at the latest within 14 working days of receiving the report together with the goods.
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