HC-05 Bluetooth Module


SKU: COM-006 Category:


The HC-05 is a mater & slave bluetooth v.2 module with a UART interface meant to simplify microcontroller interfacing with bluetooth devices such as smart phones or other microcontroller.

The default transparent mode baud rate is 9600 with 8-N-1 serial settings

Here are some basic specifications:

Bluetooth protocal: Bluetooth Specification v2.0+EDR
Frequency: 2.4GHz ISM band
Modulation: GFSK(Gaussian Frequency Shift Keying)
Emission power: ≤4dBm, Class 2
Sensitivity: ≤-84dBm at 0.1% BER
Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps
Security: Authentication and encryption
Profiles: Bluetooth serial port
Power supply: +3.3VDC 50mA
Working temperature: -20 ~ +75Centigrade
Dimension: 26.9mm x 13mm x 2.2 mm

HC-05 vs HC-06

The HC-05 may be operated as a master or as a slave device. In contrast, its smaller variant, the HC-06 is slave-only and cannot operate as a master. And because there is very small price difference between the the HC-05 and HC-06, the HC-05 is the preferred module.


This link is a good starting point tutorial

A summary of AT commands can be found here