Final Year Project 2 (Week 5)

Week 5

Tittles of activity:

• Research about the 'Bluetooth Module' HC-05

Analysis:

• Bluetooth serial module is used for converting serial port to Bluetooth. These modules have two modes: master and slaver device. The device named after even number is defined to be master or slaver when out of factory and can’t be changed to the other mode. But for the device named after odd number, users can set the work mode (master or slaver) of the device by AT commands.

• When HC-05 is out of factory, one part of parameters is set for activating the device. The work mode is not set, since user can set the mode of HC-05 as they want. The main function of Bluetooth serial module is replacing the serial port line, such as:

1.  There are two MCUs want to communicate with each other. One connects to Bluetooth master device while the other one connects to slave device. Their connection can be built once the pair is made. This Bluetooth connection is equivalently liked to a serial port line connection including RXD, TXD signals and they can use the Bluetooth serial module to communicate with each other.

2.    When MCU has Bluetooth slave module, it can communicate with Bluetooth adapter of computers and smart phones. Then there is a virtual communicable serial port line between MCU and computer or smart phone.

3.  The Bluetooth devices in the market mostly are slave devices, such as Bluetooth printer, Bluetooth GPS. So, we can use master module to make pair and communicate with them. Bluetooth Serial module’s operation doesn’t need drive, and can communicate with the other Bluetooth device which has the serial. 

Bluetooth Module HC-05