How to Use Bluetooth 5.0 Audio Receiver Board-Controllable Volume: Examples, Pinouts, and Specs

The Bluetooth 5.0 Audio Receiver Board-Controllable Volume (Manufacturer: Core Electronics, Part ID: DFR0719) is a compact and versatile module designed for wireless audio streaming. Leveraging Bluetooth 5.0 technology, it ensures high-quality audio transmission with low latency. The board features an integrated volume control, making it ideal for applications where precise audio level adjustments are required.

• Wireless audio systems (e.g., home theaters, portable speakers)
• DIY audio projects
• Car audio upgrades
• Hands-free audio solutions
• Educational and prototyping projects

Below are the key technical details of the Bluetooth 5.0 Audio Receiver Board-Controllable Volume:

The board includes several pins for power, audio output, and control. Below is the pinout:

1. Power the Board: Connect the VCC pin to a 5V DC power source and the GND pin to ground.
2. Connect Audio Output: Use the L_OUT, R_OUT, and GND_OUT pins to connect the board to an audio amplifier or speaker system. Alternatively, use the 3.5mm audio jack for direct connection.
3. Pair with a Bluetooth Device:
   • Power on the board. It will enter pairing mode automatically (indicated by a blinking LED).
   • On your Bluetooth-enabled device (e.g., smartphone, laptop), search for available devices and select the board (usually named "DFR0719").
   • Once paired, the LED will stop blinking and remain steady.
4. Control Volume and Playback:
   • Use the VOL+ and VOL- pins (or buttons) to adjust the volume.
   • Use the PLAY/PAUSE pin (or button) to control playback.

• Ensure the power supply provides a stable 5V DC to avoid damage to the board.
• Keep the board within the specified communication range (15 meters) for optimal performance.
• Avoid placing the board near sources of electromagnetic interference (e.g., high-power motors, Wi-Fi routers).
• Use a heat sink or proper ventilation if the board is used in a high-temperature environment.

The Bluetooth 5.0 Audio Receiver Board can be used with an Arduino UNO for additional control. Below is an example code snippet to control volume using Arduino:

// Example code to control the Bluetooth 5.0 Audio Receiver Board
// using Arduino UNO. This code assumes buttons are connected to
// digital pins 2 (VOL+) and 3 (VOL-).

#define VOL_PLUS_PIN 2  // Pin connected to VOL+ button
#define VOL_MINUS_PIN 3 // Pin connected to VOL- button

void setup() {
  pinMode(VOL_PLUS_PIN, OUTPUT); // Set VOL+ pin as output
  pinMode(VOL_MINUS_PIN, OUTPUT); // Set VOL- pin as output
}

void loop() {
  // Simulate pressing the VOL+ button
  digitalWrite(VOL_PLUS_PIN, HIGH); // Press VOL+
  delay(100);                       // Hold for 100ms
  digitalWrite(VOL_PLUS_PIN, LOW);  // Release VOL+
  delay(1000);                      // Wait for 1 second

  // Simulate pressing the VOL- button
  digitalWrite(VOL_MINUS_PIN, HIGH); // Press VOL-
  delay(100);                        // Hold for 100ms
  digitalWrite(VOL_MINUS_PIN, LOW);  // Release VOL-
  delay(1000);                       // Wait for 1 second
}

1. The board does not power on:

   • Ensure the power supply is providing a stable 5V DC.
   • Check the connections to the VCC and GND pins.

2. Bluetooth pairing fails:

   • Ensure the board is in pairing mode (LED should blink).
   • Check if the device is within the 15-meter range.
   • Restart both the board and the Bluetooth device.

3. No audio output:

   • Verify the connections to the audio output pins or 3.5mm jack.
   • Ensure the paired device is playing audio and the volume is not muted.

4. Volume control does not work:

   • Check the connections to the VOL+ and VOL- pins.
   • Ensure the buttons or control signals are functioning correctly.

Q: Can I use a power supply higher than 5V?
A: No, the board is designed to operate at 5V DC. Using a higher voltage may damage the board.

Q: Does the board support mono audio output?
A: Yes, you can use either the L_OUT or R_OUT pin for mono output, but stereo output is recommended for optimal performance.

Q: Can I connect multiple devices simultaneously?
A: No, the board supports pairing with one device at a time.

Q: Is the board compatible with Bluetooth 4.0 devices?
A: Yes, the board is backward compatible with Bluetooth 4.0, but performance may vary.

This concludes the documentation for the Bluetooth 5.0 Audio Receiver Board-Controllable Volume (DFR0719). For further assistance, refer to the manufacturer's support resources.