This board is a pure Bluetooth audio receiver and comes without an audio amplifier.
Use it with the headphone jacks, or connect the stereo output to a dedicated external audio amplifier.
The board discussed here is marked as XY-WRBT on its back side. It is very similar to XY-P5W which in contrast has a built-in 2x5W audio amplifier.
Where To Use
This board handles all the Bluetooth audio reception and comes with built-in support for handling LiIon and LiPo batteries.
It can serve well in DIY Bluetooth Sound Boxes where you choose to use a separate dedicated audio amplifier.
Where To Avoid
If you are looking for a one-stop solution to creating a simple Bluetooth sound box, go get the integrated boards that come with 2x5W or 2x15W audio amplifiers on-board (XY-P5W or XY-P15W).
Technical Data
| Item | Description |
|---|---|
| Power Supply | Micro USB, one lithium cell, external 3.7-24V supply |
| Audio Amplifier | no amplifier |
| Speaker Impedance | no speaker connections, just pins to connect to external amplifier |
| Audio In | Headphone Jack 3.5mm |
| Bluetooth Distance | <15 Meter, SNR >= 90dB |
| Size | 44x30x5mm |
Power Supply
The board can be supplied with power in many ways due to its wide voltage range:
- Micro-USB: connect a common smartphone charger via USB
- Lithium battery: power the board with one common LiIon or LiPo cell
- External: connect to car voltage or any other power supply (3.7-24V)
Any power supply should be capable of supplying 20W of power (4A at 5V). It must be greater than 10W (2A at 5V). Insufficient power supplies negatively affect sound quality.
Using Lithium Battery
The board power can be supplied by a single LiIon or LiPo battery. The board automatically turns off when the input voltage drops below 3.3V, protecting lithium batteries from over-discharge.
Once over-discharge protection has kicked in and automatically turned off the board, after recharging the battery power on the board again. To unlock the protection, it may be necessary to connect the on pins for at least 2 seconds (if you connected an on/off push button to this port, press the button for >2sec.)
When you power this board via battery, and the battery is approaching its empty state, the voltage falls to a level where the board starts making “sizzling” noises. This can be used as an indicator to recharge batteries before over-discharge protection kicks in.
The lithium battery can be directly charged via the Micro USB connection.
Never operate lithium batteries without battery protection board (BMS): check your battery to find out whether it has a built-in BMS.
Audio Out
Audio can be played to headphones via 3.5mm headphone jack, or by connecting the stereo output to an external amplifier.
You cannot directly connect speakers to this board as it does not have a built-in audio amplifier.
Volume is controlled by a half-rounded switch:
- Volume: turn switch towards the USB connector to lower volume, and turn it to the other direction to raise it.
- Play/Pause: press the button to toggle play and pause.
On and Off
Next to the external power input pins, there are two solder pads marked woke. They can be used to turn the board on and off:
Connect the pins for 2 seconds to toggle between on and off.
Through-Hole Pins
All pins are through-hole and accessible from the back side as well.
Some pins are labeled on the backside only:
Bluetooth Connect
After supplying power, a blue LED starts blinking. The device is now in bluetooth pairing mode and can be detected by i.e. your smartphone.
Once a bluetooth connection is made and the board is coupled, the blue LED stops blinking and lights constantly.
When music is played back, the blue LED flashes slowly.
All Bluetooth functionality is provided by a AC… chip manufactured by Zuhai Jie Li. This company produces cheap chips for a wide variety of consumer products.
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(content created Apr 02, 2024 - last updated Apr 13, 2024)