The Pico W USB Audio to Bluetooth Adapter transforms your Raspberry Pi Pico W into a high-quality audio streaming device. It allows any device with a USB input, including MacOS, Windows, Linux, Nintendo Switch, PS4/PS5, and more, to gain Bluetooth Audio capability. With Pico W Adapter, you can easily transmit audio wirelessly from your USB audio source to your Bluetooth headphones or speaker, enhancing your listening experience.
Setting up PicoW requires no driver or software installation. Simply plug the Pico W into your device's USB port, set your Bluetooth headphones or speakers to pairing mode, and an automatic connection will be made.
Pico W Bluetooth Adapter utilizes multiple codecs to deliver high-quality audio.
The input is 16-bit 44100Hz PCM audio, and it can steam LDAC audio at 303(Mobile Quality) on Pico W and 606(Standard Quality) Kbps/ 909 Kbps on Pico 2 W.
Only work on Pico 2 W. The input is 16-bit 44100Hz PCM audio, and use fdk-acc to encode the aac.
Ready to use: There is a sbc only project that can learn how btstack and tinyusb work on Pico W
Installing the Pico W USB Audio to Bluetooth Adapter firmware involves flashing a UF2 (USB Flashing Format) file onto your Raspberry Pi Pico. Follow these steps:
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Download the UF2 file: You can find the latest firmware for the PicoW USB Audio to Bluetooth Adapter at the releases page of the GitHub repository. Download the
.uf2file from the latest release. -
Connect the Pico to your computer: First, ensure that your Pico is not connected to your computer. Then, hold down the 'BOOTSEL' button on the Pico while you plug it into your computer using a micro USB cable. It will appear on your computer as a mass storage device (like a USB flash drive).
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Copy the UF2 file: Simply drag and drop (or copy and paste) the downloaded UF2 file onto the Pico.
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Reset the Pico: Once the UF2 file has been copied onto the Pico, it will automatically reset and start running the new firmware.
Using the PicoW USB Audio to Bluetooth Adapter is a straightforward process. Here are the steps to follow:
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Connect your Pico W to your audio source device: Use a USB cable to connect your Raspberry Pi Pico W to the device that you want to stream audio from.
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Set the audio output on your source device: On your audio source device, go to your sound settings and change the audio output device to
TinyUSB BT. -
Pairing a new device: To pair a new device, long press the 'BOOTSEL' button on the Pico W and release it the led light will blink fast. Then, put the new Bluetooth device into pairing mode. The Pico W will automatically connect to it.
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Start playing audio: Once everything is set up, you can start playing audio from your source device. The audio will be streamed to your Bluetooth device via the Pico W.
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Reconnecting a device: You can connect/reconnect the headphone by short pressing the 'BOOTSEL' button when it is not streaming audio (LED light not blinking)
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If you press the key for times but it has no response. It means it is crash. Please reconnect the USB.
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starting at v0.8 the program can remember 2 devices. When connected to USB the led will blink for 2 times fast for device A and 3 times fast for device B.
Double press the 'BOOTSEL' button can switch the device A or B and led will blink 2/3 times correspond to A/B.
After any bluetooth connection, switching device will not be available until reconnect the USB
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When connected: single press key-> volume+; double press key-> volume-
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Blinking Slow (1s): When the Green LED light is blinking slow, it indicates that audio is currently streaming. Different LED light on time means different streaming mode:
LED on time codec 0.2s AAC 3s LDAC 1s SBC -
Blinking Fast (0.5s): It means that the PicoW Adapter is in pairing mode.
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On (Steady Light): It means that the PicoW Adapter is on standby. Short-press the key to reconnect the last saved device.
In order to compile the PicoW USB Audio to Bluetooth Adapter firmware from source code, you need to follow these steps:
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Prepare your environment: Use VS Code and Raspberry Pi Pico extension
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Import the project on the Raspberry Pi Pico extension: Import the project using General -> Import Project
Choose Pico W or Pico 2 W using Switch Board
Then you can Debug, Compile and Run the project on the Project tab
- Debug Serial input/output: You can use uart to see the debug info. Connect the GPIO 0 and 1 as TX and RX. To enable BTstack's serial input, you can uncomment
HAVE_BTSTACK_STDINunder btstack_config.h
This project wouldn't have been possible without the foundational work provided by the following projects:
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tinyusb uac2_headset: Tinyusb UAC2 headset demo
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a2dp_source_demo: The Advanced Audio Distribution Profile (A2DP) source demo provided by the BTstack.
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avdtp_source_test.c: The Audio tests (avdtp_source_test.c and avdtp_sink_test) support the folowing audio codecs: SBC, AAC, aptX, and LDAC.
This project is licensed under the terms of the Apache License 2.0.
Copyright (C) 2013 - 2016 Sony Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
NOTICE
---------------
Certification
---------------
Taking the certification process is required to use LDAC in your products.
For the detail of certification process, see the following URL:
https://www.sony.net/Products/LDAC/aosp/
ldacBT: https://github.com/EHfive/ldacBT
Copyright 2018-2019 Huang-Huang Bao
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.