Product Description of Bluetooth Module HC05

• Pin number one is for toggle between data mode and AT command mode. By default, this pin is in data mode.
• VCC pin is for power the module. This will connect to the 5V supply voltage.
• GND pin is used to Ground pin of the module. And connect to the system ground.
• TX pin transmits the serial data. Data received via Bluetooth will be given out through this transmit pin as serial data.
• RX pin receives serial data. Serial data will be given to this pin will broadcast through Bluetooth.
• State pin is 6^th pin. This pin connected to the onboard LED. This pin is used when we want to check if Bluetooth is working properly or not.
• There is an LED on the HC05 module. When it blinks one time in 2 sec. it means the module is in command mode.
• If it blinks continuously than it means it is waiting for a connection in Data mode.
• If this LED blinks twice in 1 sec it means connection successfully in data mode.
• There is also a button which is used to enable the pin to toggle between data and command mode.

Specifications of Bluetooth Module HC05:

• This Bluetooth module is for Arduino and other microcontrollers.
• Its operating voltages are 4 to 6 volts.
• Its operating current is 30mA.
• It ranges us 100m.
• It works with serial communication and TTL compatible.
• It follows the IEEE 802.15.1 standard protocol.
• it can operate in master or slave mode or in both modes.
• We can interface it with a laptop or mobile phone.

Applications:

• It supports wireless communication between two microcontrollers.
• It communicates with a laptop, desktop, and mobile phones.
• It is used in the data logging application.
• It is also used in consumer applications
• It is used in wireless robots
• It is used in home automation.