BT-09 Bluetooth 4.0 BLE Serial Port Module – CC2541 Chip, HM-10 Compatible

The BT-09 Bluetooth 4.0 BLE Module is a compact, low-energy wireless serial communication module built around the reliable Texas Instruments CC2541 chip. Fully compatible with the popular HM-10 module, it's the go-to choice for makers, engineers, and hobbyists who need a drop-in Bluetooth Low Energy (BLE) solution for their microcontroller projects.

Whether you're building a wireless sensor network, adding BLE connectivity to an Arduino or Raspberry Pi project, or prototyping a custom IoT device, the BT-09 delivers stable serial communication with minimal power draw — right out of the box.

Key Features

Bluetooth 4.0 BLE — Ultra-low power consumption, ideal for battery-powered applications
CC2541 Chipset — Proven, high-performance BLE SoC from Texas Instruments
HM-10 Compatible — Drop-in replacement; use the same firmware commands and pinout
Serial UART Interface — Simple TX/RX communication; plug into any microcontroller with ease
AT Command Support — Fully configurable via standard AT commands (baud rate, device name, etc.)
Compact Form Factor — Easy to embed into tight enclosures and custom PCBs
Broad Compatibility — Works with Arduino, Raspberry Pi, STM32, ESP32, and more

Technical Specifications

Bluetooth Version: 4.0 BLE (Bluetooth Low Energy)
Chip: CC2541 (Texas Instruments)
Interface: UART Serial (TTL)
Operating Voltage: 3.3V
Communication Protocol: AT Commands
HM-10 Pin & Firmware Compatible

What Can You Build With It?

The BT-09 module is perfect for a wide range of DIY and professional projects:

Wireless data logging and sensor monitoring
Smartphone-controlled robotics and automation
Custom BLE peripheral devices
Home automation and IoT prototyping
Wearable electronics with low-power requirements

Frequently Asked Questions

Q: What is the BT-09 Bluetooth 4.0 BLE Module and what does it do?

A: The BT-09 is a compact Bluetooth Low Energy (BLE 4.0) serial communication module based on the CC2541 chip. It enables wireless UART serial data transmission between a microcontroller (such as Arduino or Raspberry Pi) and a smartphone or other BLE-enabled device. It is HM-10 compatible, making it an easy drop-in upgrade or replacement for existing BLE serial projects.

Q: Is the BT-09 module compatible with Arduino and Raspberry Pi?

A: Yes! The BT-09 uses a standard UART TTL serial interface and supports AT commands, making it fully compatible with Arduino, Raspberry Pi, STM32, ESP32, and virtually any microcontroller with a serial port. Simply connect TX, RX, VCC (3.3V), and GND to get started.

Q: How is the BT-09 different from or better than the HM-10 module?

A: The BT-09 is designed to be pin-compatible and firmware-compatible with the HM-10, meaning you can use the same AT commands and wiring. The CC2541 chipset provides a well-established, stable BLE 4.0 platform. It serves as a cost-effective alternative or direct replacement for HM-10 modules in most projects.

Q: What operating voltage does the BT-09 module require?

A: The BT-09 module operates at 3.3V. If your microcontroller outputs 5V logic (e.g., standard Arduino Uno), a simple logic level converter or voltage divider on the TX line is recommended to protect the module.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.