REF-BTS 2CH Documentation

1. Introduction

The REF-BTS 2CH is a reference design for a 2-channel Bluetooth stereo audio system, manufactured by RUET Electra Force. This component is typically used for wireless audio applications, providing high-quality stereo sound over Bluetooth connections. It is ideal for use in home audio systems, portable speakers, and automotive audio systems.

2. Technical Specifications

Key Technical Details

Pin Configuration and Descriptions

3. Usage Instructions

How to Use the Component in a Circuit

1. Power Supply: Connect the VCC pin to a 3.3V - 5V power supply and the GND pin to the ground of your circuit.
2. Audio Output: Connect the L_OUT and R_OUT pins to the left and right audio channels of your amplifier or speaker system.
3. Bluetooth Enable: Connect the BT_EN pin to a high logic level (3.3V or 5V) to enable the Bluetooth functionality.
4. Status Indicator: The STATUS pin can be connected to an LED to indicate the Bluetooth connection status.
5. UART Configuration: If needed, connect the RXD and TXD pins to a microcontroller (e.g., Arduino) for configuration purposes.

Important Considerations and Best Practices

• Ensure that the power supply voltage is within the specified range (3.3V - 5V) to avoid damaging the component.
• Use appropriate decoupling capacitors close to the VCC pin to filter out noise from the power supply.
• Keep the audio output traces as short as possible to minimize noise and signal loss.
• If using the UART interface for configuration, ensure that the microcontroller's UART voltage levels are compatible with the REF-BTS 2CH.

Example Arduino Code

Below is an example code to configure the REF-BTS 2CH using an Arduino UNO:

#include <SoftwareSerial.h>

// RX and TX pins for SoftwareSerial
const int RX_PIN = 10;
const int TX_PIN = 11;

// Create a SoftwareSerial object
SoftwareSerial btSerial(RX_PIN, TX_PIN);

void setup() {
  // Initialize serial communication with the computer
  Serial.begin(9600);
  
  // Initialize serial communication with the Bluetooth module
  btSerial.begin(9600);
  
  // Enable the Bluetooth module
  pinMode(5, OUTPUT);
  digitalWrite(5, HIGH);
  
  // Wait for the Bluetooth module to initialize
  delay(1000);
  
  // Send a test command to the Bluetooth module
  btSerial.println("AT");
}

void loop() {
  // Check if data is available from the Bluetooth module
  if (btSerial.available()) {
    // Read the data and print it to the Serial Monitor
    char c = btSerial.read();
    Serial.print(c);
  }
  
  // Check if data is available from the Serial Monitor
  if (Serial.available()) {
    // Read the data and send it to the Bluetooth module
    char c = Serial.read();
    btSerial.print(c);
  }
}

4. Troubleshooting and FAQs

Common Issues Users Might Face

1. No Audio Output:

   • Ensure that the power supply is within the specified range.
   • Check the connections to the audio output pins (L_OUT and R_OUT).
   • Verify that the Bluetooth device is properly paired and connected.

2. Bluetooth Connection Issues:

   • Ensure that the BT_EN pin is set to a high logic level.
   • Check the Bluetooth device's settings and ensure it is discoverable.
   • Verify that there are no other devices causing interference.

3. UART Communication Problems:

   • Ensure that the RXD and TXD pins are correctly connected to the microcontroller.
   • Verify that the baud rate settings match between the Bluetooth module and the microcontroller.

Solutions and Tips for Troubleshooting

• Power Supply Issues: Use a stable and regulated power supply. Check for loose connections and ensure proper grounding.
• Audio Quality Problems: Use shielded cables for audio connections and keep them away from high-frequency signals.
• Bluetooth Range: Ensure there are no physical obstructions between the Bluetooth module and the paired device. Use an external antenna if necessary.

By following this documentation, users should be able to effectively integrate and troubleshoot the REF-BTS 2CH in their wireless audio applications.