Overview

Over the course of multiple client projects, we have worked extensively with different types of Bluetooth modules, gaining expertise in selecting, testing, and integrating them into end products

Bluetooth modules are widely used in our product designs to transmit and receive data wirelessly between devices.
These modules are packaged as SiP (System-in-Package) solutions, which include a Bluetooth SoC along with supporting components such as crystals, memory, voltage regulators, and RF antennas.

Modules are chosen for fast product development as they are pre-certified, reducing both time and cost of certification. Many modules also come bundled with licenses such as aptX, which saves additional licensing costs and makes them easier to integrate into audio products.

Our work spans multiple Bluetooth generations (2.0, 3.0, 4.x, 5.x) and includes both Classic Bluetooth and Bluetooth Low Energy (BLE). Beyond hardware integration, we have hands-on experience with configuring and using a wide range of Bluetooth profiles:

  • A2DP (Advanced Audio Distribution Profile) – for high-quality stereo audio streaming.

  • AVRCP (Audio/Video Remote Control Profile) – for playback control such as play, pause, and track navigation.

  • HFP (Hands-Free Profile) – for wireless microphone audio in headsets and communication systems.

  • SPP (Serial Port Profile) – for data communication and replacing legacy serial links with wireless connectivity.

  • BLE (Bluetooth Low Energy) – for low-power data transfer and beacon applications.

By working with different module vendors and these diverse profiles, we can recommend and implement the right Bluetooth solution depending on application requirements. Whether the need is low-latency audio for headsets, reliable BLE data transfer for IoT devices, or robust wireless links for industrial systems, our team has developed practical expertise across multiple Bluetooth technologies.

More Information on Bluetooth Modules

List of Bluetooth Modules Used and Tested

Audio Bluetooth Modules

1. Sierra Wireless BC127

  • Bluetooth 4.2 module
  • Supports high-quality audio transmission and reception
  • BLE supported
  • Audio profiles: A2DP, AVRCP, HFP, MAP
  • Used in BlueBox project

Detailed functions

2. Microchip RN52

  • Bluetooth 3.0 module
  • Audio profiles: A2DP, AVRCP, HFP, SPP
  • Supports iAP (iPod Accessory Protocol)
  • Used for audio receiving in Bluetooth speaker products (A2DP profile)
  • Implemented in BrainWave Headset project (A2DP profile)

3. Feasycom FSC-BT966

  • Bluetooth 5.0
  • Supports BR/EDR and LE for audio and data communication
  • Profiles: SPP, BLE, HFP, AVRCP, A2DP, HID
  • Used to send microphone audio directly to a Bluetooth speaker (HFP, A2DP profile as transmitter)

4. Feasycom FSC-BT806A

  • Bluetooth 5.1 transceiver module (audio transmit/receive)
  • Profiles: SPP, BLE, HFP, AVRCP, A2DP, HID
  • Supports aptX and aptX Low Latency for high-quality, low-latency audio streaming
  • Used to send microphone audio directly to Bluetooth speakers with low latency (HFP, A2DP with aptX-LL)

5. HM10

  • Bluetooth 4.0
  • BLE supported (Bluetooth Low Energy)
  • Used for data transfer in BLE protocol and in beacon mode
  • Implemented in the Nulock project

6. HC05

  • Bluetooth 2.0 module
  • Supports EDR (Enhanced Data Rate)
  • Used to transmit and receive serial data in products (SPP profile)

7. ESP32

  • Dual-core Wi-Fi + Bluetooth module
  • Supports both Classic Bluetooth and BLE
  • Widely used in projects requiring combined wireless connectivity