Bluetooth Serial Transceiver HM-10

This is the popular Bluetooth module, HM-10. It works in both master and slave modes.

• Master Bluetooth will be able to search for other Bluetooth devices and initiate a connection.
• Slave Bluetooth cannot search for other Bluetooth devices and wait for the master to initiate and accept the connection.

It's very easy to add wireless serial connectivity for your device with this module because it comes with a UART interface. Examples for Arduino and other boards are readily available online, one of them is from Hackster.io. Once you pair with other Bluetooth devices you work like normal UART to exchange data. We called this transparent mode. You can also use AT command and set the baud rate. 

Check out the video demonstration from Sukapura Tech on the interfacing HM-10 with Arduino:

This module has a built-in 3.3V voltage regulator and helps to break out the important pins (STATE, RXD, TXD, GND, VCC, and EN). Based on CSR BC4 chip, Bluetooth V2.0 + EDR. It is default loaded with SPP (Serial Port Profile) which becomes UART when it is connected via Bluetooth link. And there is a push button on HM-10 to set it into AT mode (default baud: 9600).

Features:

• Support AT command, users can change the serial port baud rate, device name, pairing password and other parameters as needed, use flexible.
• It adopts CC2541 chip of American TI Company, configures 256Kb space, and follows V4.0 BLE Bluetooth specifications.
• Input voltage: 3.3V/5V only needs a set of power supply.
• This module supports UART interface and supports SPP Bluetooth serial port protocol.
• Pins:
  • RX: Bluetooth module serial receiver and TXD MCU connection.
  • TX: Bluetooth module serial port and RXD MCU connection.
  • GND: ground terminal
  • VCC: power supply side 3.3V power supply
  • EN: Enable
• Default Baudrate: 9600

Packing list:

• 1 x Bluetooth Serial Transceiver HM-10

Resources:

• AT command