The HM-10 is a compact Bluetooth Low Energy (BLE) module based on the TI CC2541 SoC. This bare version (without adapter board) is ideal for embedded integration into custom PCBs or direct 3.3 V microcontroller interfaces. It supports BLE 4.0 communication with smartphones, tablets, and BLE-enabled devices.

Specifications

• Bluetooth Version: 4.0 BLE (Bluetooth Low Energy)
• SoC: TI CC2541 (8051 core + BLE radio)
• Operating Voltage: 3.3 V DC (no onboard regulator)
• Logic Level: 3.3 V (direct connection only)
• Communication Interface: UART (TXD, RXD)
• Default Baud Rate: 9600 (configurable via AT commands)
• Role: Peripheral (slave) only
• Range: ~10–20 m (open space)
• Power Consumption:
  - Active: ~8 mA
  - Sleep: ~400 μA
• Antenna: Onboard PCB antenna
• Dimensions: ~27 mm × 13 mm
• Pinout:
  - VCC, GND
  - TXD, RXD
  - STATE (connection status)
  - EN (key pin for AT mode)
• Firmware: Original HM-10 firmware (supports AT commands)
• Packaging: Bare module (no adapter board or voltage regulator)

Features

• BLE 4.0 communication for mobile and IoT integration
• Compact and lightweight for embedded PCB designs
• AT command support for name, baud rate, and UUID configuration
• Compatible with Arduino, ESP32, STM32, and other 3.3 V microcontrollers
• Ideal for low-power wireless data exchange
• Common use cases:
  - BLE sensor nodes and wearable electronics
  - Smartphone-controlled Arduino projects
  - Wireless UART bridges and automation systems
  - DIY BLE beacons and remote controls