The HM-10 is a Bluetooth 4.0 Low Energy (BLE) module based on the CC2540 or CC2541 chip from Texas Instruments. It is a small, low-power device that can be used to add Bluetooth connectivity to a variety of projects. The HM-10 can operate as either a central device or a peripheral device, allowing it to connect to other BLE devices or be discovered by them. The module supports a variety of protocols, including the Serial Port Profile (SPP), which allows it to function as a virtual serial port. It can be programmed and controlled using AT commands or via a serial connection. The HM-10 is commonly used in IoT applications, as well as in projects that require wireless communication between devices.

The HM-10 Bluetooth module for Arduino (Master Slave) uses the TI CC2540 or CC2540 chip, configure 256KB space, and support AT command. Users can change the role (master, slave mode) and the serial port baud rate, equipment name, matching password and other parameters on-demand. It is very flexible to use.