HC-05 Bluetooth Wireless transmission module for Arduino details

Bluetooth transmission module can enable you to get rid of using cable for a serial port device and realize wireless serial communication within 10 meters. Bluetooth transmission module has only 4 AT command. Respectively are communication testing, name changing, baud rate changing, matching password changing. AT command must be set from TXD, RXD signal pins, not via bluetooth channel. Device sending the AT command can be various types of MCU (for example, 51, avr, PIC, msp430, arm, etc.). It can also be a computer sending via serial port (PC serial port connected to MAX232 or USB serial port).