How to Use 5V Bluetooth Audio Receiver: Examples, Pinouts, and Specs

The 5V Bluetooth Audio Receiver is an electronic component designed to wirelessly receive audio signals via Bluetooth technology. It is commonly used in a variety of applications such as wireless speakers, car audio systems, headphones, and home entertainment systems. This receiver operates on a 5V power supply, making it compatible with many consumer electronics and DIY projects, including integration with microcontrollers like the Arduino UNO.

• Bluetooth Version: 4.0 (or higher)
• Supply Voltage: 5V DC
• Operating Current: 30-50mA
• Operating Temperature: -10°C to +50°C
• Audio Output: Stereo, can drive 3W speakers directly
• Frequency Range: 2.4GHz - 2.480GHz
• Sensitivity: -85dBm at 0.1% BER
• SNR: ≥75dB
• THD+N: -0.1%
• Range: Up to 10 meters (without obstacles)

1. Power Supply: Connect the VCC pin to a 5V power source and the GND pin to the common ground.
2. Audio Output: Connect the L_OUT and R_OUT pins to the respective inputs of an audio amplifier or directly to speakers if the receiver supports driving them.
3. Pairing Button: Optionally, connect a momentary push button to the KEY pin for initiating pairing mode.
4. Status LED: Connect an LED through a current-limiting resistor to the LED pin to visualize the receiver's status.

• Ensure that the power supply is regulated and does not exceed 5V to avoid damaging the receiver.
• Keep the receiver away from sources of interference, such as Wi-Fi routers or microwave ovens.
• For optimal audio quality, use shielded cables for connections to the audio output.
• When integrating with an Arduino or similar microcontroller, ensure that the Bluetooth receiver is powered separately if the microcontroller cannot provide sufficient current.

// No specific code is required for the basic operation of the Bluetooth Audio Receiver.
// However, if you wish to control or monitor the receiver using an Arduino UNO, you can
// read the status of the pairing button or control the status LED.

const int pairingButtonPin = 2; // Connect to KEY pin of the receiver
const int statusLedPin = 13;    // Connect to LED pin of the receiver

void setup() {
  pinMode(pairingButtonPin, INPUT_PULLUP);
  pinMode(statusLedPin, OUTPUT);
}

void loop() {
  // Read the state of the pairing button
  bool isPairing = !digitalRead(pairingButtonPin); // Active low button

  // If the button is pressed, blink the LED
  if (isPairing) {
    digitalWrite(statusLedPin, HIGH);
    delay(250);
    digitalWrite(statusLedPin, LOW);
    delay(250);
  } else {
    digitalWrite(statusLedPin, LOW);
  }
}

• No Audio Output: Ensure that the receiver is properly powered and that the audio cables are securely connected.
• Unable to Pair: Make sure the receiver is in pairing mode and that it is not already paired with another device.
• Poor Audio Quality: Check for sources of interference and ensure that the audio cables are of good quality and properly shielded.

Q: Can the receiver be used with devices other than an Arduino? A: Yes, the receiver can be used with any compatible device that provides a 5V power supply and can process the audio output signals.

Q: How do I put the receiver into pairing mode? A: Typically, you would press and hold the connected pairing button for a few seconds until the status LED begins to blink rapidly.

Q: What is the maximum range of the Bluetooth connection? A: The receiver has a range of up to 10 meters in open space, but this can be reduced by walls and other obstacles.

Q: Can the receiver connect to multiple devices at once? A: Most Bluetooth audio receivers can only maintain a connection with one device at a time.

For further assistance, consult the manufacturer's datasheet or contact technical support.