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HC-05 is a Bluetooth module which is designed for wireless comunication. This module can be used in a master or slave configuration. It has 6 pins, 1. Key/EN: It is used to bring Bluetooth module in AT commands mode. If Key/EN pin is set to high, then this module will work in command mode. Otherwise by default it is in data mode. The default baud rate of HC-05 in command mode is 38400bps and 9600 in data mode. HC-05 module has two modes, 1. Data mode: Exchange of data between devices. 2. Command mode: It uses AT commands which are used to change setting of HC-05. To send these commands to module serial (USART) port is used. 2. VCC: Connect 5 V or 3.3 V to this Pin. 3. GND: Ground Pin of module. 4. TXD: Transmit Serial data (wirelessly received data by Bluetooth module transmitted out serially on TXD pin) 5. RXD: Receive data serially (received data will be transmitted wirelessly by Bluetooth module). 6. State: It tells whether module is connected or not.