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The HC-05 is a popular wireless serial communication module that operates in either Master or Slave mode, switchable using AT commands, with Slave mode as the default. In Slave mode it accepts incoming connections, while in Master mode it initiates the connection to another device.
It follows the Bluetooth Specification v2.0+EDR, works in the 2.4 GHz ISM band and uses GFSK modulation, with authentication and encryption for the wireless link.
Emission power is up to 4 dBm (Class 2), with a sensitivity of -84 dBm or better at 0.1% bit error rate. Speed reaches 2.1 Mbps asynchronous maximum, or 160 kbps typical asynchronous, and 1 Mbps synchronous in each direction. The module runs from 3.3 V DC at around 50 mA and works from -20 to +75 C. It measures 26.9 x 13 x 2.2 mm.
Because the module's logic level is 3.3 V, use a level shifter or a resistor divider if your microcontroller runs at 5 V logic on the receive line. The module is used in embedded projects, industrial applications, computers, portable devices and GPS receivers for wireless serial links.
Hobbyists and developers who need a simple, well-documented wireless serial link between two boards, or between a board and a phone or PC.
HC-05 boards are commonly sold on a small breakout with an onboard voltage regulator, which lets you power the board itself from 5V even though the Bluetooth chip runs at 3.3V logic internally; check your specific board's markings to see whether this applies, since the bare module datasheet only covers the chip itself.
Yes, the mode is switchable with AT commands, and Slave is the default.
Bluetooth 2.0+EDR.
3.3 V DC.
2.1 Mbps asynchronous maximum.
No, it is 3.3 V logic, so use a level shifter for a 5V microcontroller's transmit line.
| Brand | Generic |
|---|---|
| Selling unit | PCS |
