HM-11 Bluetooth 4.0 BLE Serial Port Module – CC2541, UART TTL, 3.3V
Product Description
The HM-11 Bluetooth 4.0 BLE Serial Port Module is a compact, low-power Bluetooth Low Energy (BLE) module designed for wireless communication between electronic devices. Based on the Texas Instruments CC2541 chip, it enables serial data transmission between compatible Bluetooth devices and microcontrollers.
With a UART (TTL) interface and AT-command configuration, the HM-11 can be used to configure communication settings such as the device name, baud rate, operating role and pairing parameters, depending on the installed firmware.
This module is suitable for Arduino projects, embedded systems, wireless sensor networks, DIY electronics and IoT prototypes. It supports BLE communication with compatible iOS and Android devices.
Key Features
Bluetooth 4.0 BLE: Designed for Bluetooth Low Energy wireless communication.
CC2541 Chipset: Based on the Texas Instruments CC2541 BLE SoC.
UART TTL Interface: Connects to compatible microcontrollers and serial devices.
AT Command Support: Configure supported module settings through serial commands.
Low-Power Operation: Suitable for battery-powered electronic projects.
Compact Design: Measures approximately 13.5 × 18.5 × 2.3 mm.
Configurable Parameters: Supported settings may include device name, baud rate and master/slave role.
Wireless Range: Up to approximately 30 metres in an open environment, depending on conditions and antenna design.
Technical Specifications
Parameter | Specification |
Product Model | HM-11 |
Bluetooth Version | Bluetooth 4.0 BLE |
Main Chip | TI CC2541 |
Operating Frequency | 2.4 GHz ISM band |
Interface | UART TTL |
Supply Voltage | 3.3V DC |
Default Baud Rate | 115200 bps (as supplied) |
Transmit Current | Approximately 15 mA |
Receive Current | Approximately 8.5 mA |
Deep Sleep Current | Approximately 600 µA |
Modulation | GFSK |
Communication Range | Up to approximately 30 m in open conditions |
Operating Temperature | -40°C to +65°C |
Dimensions | 13.5 × 18.5 × 2.3 mm |
Configuration | AT commands, firmware dependent |
Applications
Arduino and microcontroller projects
Wireless sensor monitoring
DIY IoT and home automation prototypes
Bluetooth-enabled data acquisition
Battery-powered embedded systems
Wireless control and telemetry projects
Compatible Android and iOS BLE applications
Serial communication between compatible BLE devices
Package Includes
1 × HM-11 Bluetooth 4.0 BLE Serial Port Module
Important Notes
Power supply: Use a regulated 3.3V supply as specified for the module.
Logic levels: Check the module's UART logic-level requirements before connecting it to a 5V microcontroller. Use appropriate level shifting where required.
Bluetooth compatibility: This is a BLE module, not a classic Bluetooth SPP module. Phone applications must support BLE communication.
Firmware: AT commands, supported roles, baud rate and pairing options may vary by firmware version.
Specifications: Confirm the transmission-power range, memory description and actual module variant with the supplier before relying on those details in a design.
The HM-11 is a practical choice for developers and electronics hobbyists who need compact BLE connectivity through a serial interface.
