How to Use BW16: Examples, Pinouts, and Specs

The BW16, manufactured by Realtek with the part ID RTL8720DN, is a versatile Wi-Fi and Bluetooth module designed for Internet of Things (IoT) applications. This module integrates a high-performance microcontroller, making it an ideal choice for projects requiring wireless connectivity. The BW16 supports both Wi-Fi and Bluetooth communication, enabling seamless integration into a wide range of applications, including smart home devices, wearable technology, and industrial automation.

1. Power Supply: Connect the VCC pin to a 3.3V power source and the GND pin to the ground.
2. UART Communication: Connect the TXD pin to the RX pin of your microcontroller and the RXD pin to the TX pin of your microcontroller for serial communication.
3. GPIO Pins: Use the GPIO pins for general-purpose input/output operations. These can be configured as either input or output depending on your application.
4. ADC: Connect an analog sensor to the ADC pin to read analog values.
5. PWM: Use the PWM pin to control devices like LEDs or motors with pulse width modulation.
6. Reset and Enable: Connect the RST pin to a push button for manual reset and the EN pin to enable the module.

• Power Supply: Ensure a stable 3.3V power supply to avoid damaging the module.
• Antenna Placement: For optimal wireless performance, place the module away from metal objects and other sources of interference.
• Firmware Updates: Regularly check for firmware updates from Realtek to ensure the module operates with the latest features and security patches.
• Heat Management: If operating in high-temperature environments, consider adding heat sinks or other cooling mechanisms.

Below is an example code to connect the BW16 module to an Arduino UNO for basic Wi-Fi communication.

#include <SoftwareSerial.h>

SoftwareSerial bw16(10, 11); // RX, TX

void setup() {
  Serial.begin(9600);        // Initialize serial communication at 9600 baud
  bw16.begin(9600);          // Initialize BW16 serial communication at 9600 baud
  Serial.println("BW16 Wi-Fi Module Test");
  bw16.println("AT");        // Send AT command to BW16
}

void loop() {
  if (bw16.available()) {    // Check if BW16 has sent data
    String response = bw16.readString();
    Serial.println(response); // Print the response from BW16 to Serial Monitor
  }

  if (Serial.available()) {  // Check if user has sent data from Serial Monitor
    String command = Serial.readString();
    bw16.println(command);   // Send the command to BW16
  }
}

1. Module Not Responding:

   • Solution: Check the power supply and ensure it is stable at 3.3V. Verify the connections, especially the TX and RX pins.

2. Wi-Fi Connection Issues:

   • Solution: Ensure the correct SSID and password are used. Check for interference from other wireless devices.

3. Bluetooth Pairing Problems:

   • Solution: Make sure the module is in pairing mode. Verify that the device you are pairing with supports Bluetooth 5.0.

4. Overheating:

   • Solution: Ensure proper ventilation and consider adding a heat sink if the module operates in a high-temperature environment.

1. Can the BW16 operate on 5V?

   • No, the BW16 operates on a 3.3V power supply. Using 5V can damage the module.

2. How do I update the firmware?

   • Firmware updates can be obtained from Realtek's official website. Follow the provided instructions for updating the firmware.

3. Can I use the BW16 for both Wi-Fi and Bluetooth simultaneously?

   • Yes, the BW16 supports simultaneous Wi-Fi and Bluetooth operation, making it ideal for complex IoT applications.

By following this documentation, users can effectively integrate the BW16 module into their projects, ensuring reliable and efficient wireless communication.