Starter project enabling you to add multi-room audio streaming via Bluetooth, Airplay or Spotify Connect to any old speakers or Hi-Fi using just a Raspberry Pi.

Features

• Bluetooth, Airplay and Spotify Connect support: Stream audio from your favourite music services or directly from your smartphone/computer using bluetooth.
• Multi-room synchronous playing: Play perfectly synchronized audio on multiple devices all over your place.

• Raspberry Pi 3A+/3B/3B+/4B/Zero W
• SD Card (we recommend 8GB Sandisk Extreme Pro)
• Power supply
• 3.5mm audio cable to the input on your speakers/Hi-Fi (usually 3.5mm or RCA). Alternatively you can use the HDMI port to get digital audio out.

Notes

• The Raspberry Pi Zero cannot be used on it's own as it has no audio output. To use the Pi Zero you'll need to add something like the Pimoroni pHAT DAC (out of stock and going to be replaced, see #111) to go with it.
• For an extended list of device types supported please check this link.

• A download of this project (of course)
• Software to flash an SD card (balenaEtcher)
• A free balenaCloud account
• The balena CLI tools

Running this project is as simple as deploying it to a balenaCloud application; no additional configuration is required (unless you're using a DAC HAT).

• Sign up for or login to the balenaCloud dashboard
• Create an application, selecting the correct device type for your Raspberry Pi (we recommend setting the type as Raspberry Pi 1/Zero as your application will then be compatible with the Pi 1/Zero as well as all devices that were released afterward).
• Add a device to the application, enabling you to download the OS
• Flash the downloaded OS to your SD card with balenaEtcher
• Power up the Pi and check it's online in the dashboard

• Install the balena CLI tools
• Login with balena login
• Download this project and from the project directory run balena push <appName> where <appName> is the name you gave your balenaCloud application in the first step.

After the application has pushed and the device has downloaded the latest changes you're ready to go! Before starting, connect the audio output of your Pi to the AUX input on your Hi-Fi or speakers. You can also use the HDMI port for digital audio output.

Connect to your balenaSound device:

• If using Bluetooth: search for your device on your phone or laptop and pair.
• If using Airplay: select the balenaSound device from your audio output options.
• If using Spotify Connect: open Spotify and choose the balenaSound device as an alternate output.
• The balenaSound xxxx name is used by default, where xxxx will be the first 4 characters of the device ID in the balenaCloud dashboard.

If you are running in multi-room mode, when you start streaming the device you're connected to will configure itself as the master and will broadcast a message to all other devices within your balenaCloud application to get them in sync. Note: that it can take a few seconds for the system to autoconfigure the first time you stream.

Let the music play!

You can configure some features of balenaSound by using environment variables. This can be set in the balena dashboard: navigate to dashboard -> your app -> Environment variables. Read more about environment variables here.

By default, your device will be named balenaSound xxxx. This name will show within Airplay device lists, for Spotify Connect and when searching for devices using Bluetooth. You can change this using BLUETOOTH_DEVICE_NAME environment variable that can be set in balena dashboard.

By default, balenaSound will set the output volume of your Raspberry Pi to 75% on the basis you can then control the volume upto the maximum from the connected bluetooth device. If you would like to override this, define the SYSTEM_OUTPUT_VOLUME environment variable.

Secondly, balenaSound will play connection/disconnection notification sounds at a volume of 75%. If this unsuitable, you can override this with the CONNECTION_NOTIFY_VOLUME environment variable.

Note: these variables should be defined as integer values without the % symbol.

By default, balenaSound will start in multi-room mode. When running multi-room you can stream audio into a fleet of devices and have it play perfectly synchronized. It does not matter wether you have 2 or 100 devices, you only need them to be part of the same local network.

If you don't want to use multi-room or you only have one device, you can disable it by creating the DISABLE_MULTI_ROOM variable (with any value, for example: 1).

Note: Multi-room requires a network router that supports IP multicast/broadcast (most modern routers do).

By default, balenaSound bluetooth will connect using Secure Simple Pairing mode. If you would like to override this and use Legacy Mode with a PIN code you can do it by defining the BLUETOOTH_PIN_CODE environment variable. The PIN code must be numeric and up to six digits (1 - 999999).

Note: Legacy Mode is no longer allowed on iOS devices.

balenaSound has configurable scripts you can run on connect and disconnect bluetooth events. If you would like to activate this, set the BLUETOOTH_SCRIPTS environment variable to true. Sample scripts can be found on the ./bluetooth-audio/bluetooh-scripts/ directory, theses can be edited as needed.

Spotify Connect only works with Spotify Premium accounts (due to the use of the librespot library).

If you are using a DAC board, you will need to make a couple of changes to the device configuration in the balenaCloud dashboard.

• Disable the on-board audio by editing the existing RESIN_HOST_CONFIG_dtparam variable to set ”audio=off”.
• Add an additional custom configuration variable called BALENA_HOST_CONFIG_dtoverlay. The value of this will depend on your DAC board. A table of values is available here

• After the application has pushed and the device has downloaded the latest changes you're ready to go!
• Connect the audio output of your Pi to the AUX input on your Hi-Fi or speakers
• The balenaSound bluetooth/airplay/spotify xxxx name is used by default, where xxxx will be the first 4 characters of the device ID in the balenaCloud dashboard.
• If using Bluetooth: search for your device on your phone or laptop and pair.
• If using Airplay: select the balenaSound device from your audio output options.
• If using Spotify Connect: open Spotify and choose the balenaSound device as an alternate output.
• Let the music play! If you have a Spotify Premium account you can stream locally without any configuration, but if you want to use Spotify Connect over the internet you will need to provide your Spotify credentials.

To enable Spotify login you can add your username/e-mail and password, which are set with two environment variables: SPOTIFY_LOGIN and SPOTIFY_PASSWORD.

This project is in active development so if you have any feature requests or issues please submit them here on GitHub. PRs are welcome, too.