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Product Name: HC-05 Bluetooth Module Original

The HC-05 is a versatile Bluetooth module designed to add **two-way wireless communication** to embedded systems. Unlike the HC-06, the HC-05 supports both **Master and Slave** modes, allowing greater flexibility in device pairing and control. It uses **Bluetooth 2.0 + EDR**, supports UART/USART communication, and is widely used with microcontrollers like Arduino, STM32, Raspberry Pi, and ESP32. Whether you’re building wireless robots or home automation systems, the HC-05 is a go-to option for stable Bluetooth connectivity.

Specifications:

Bluetooth Version	Bluetooth V2.0 + EDR
Operating Voltage	4V to 6V (Typically +5V)
Operating Current	30mA
Communication Protocol	Serial (UART/USART), TTL compatible
Frequency Band	2.4GHz ISM Band (FHSS)
Range	< 100 meters (open field)
Baud Rates Supported	9600, 19200, 38400, 57600, 115200, 230400, 460800
Default Baud Rate	9600 (Data Mode), 38400 (Command Mode)
Default Bluetooth Name	HC-05
Default Password	1234 or 0000
Modes Supported	Data Mode & AT Command Mode
Firmware	LINVOR

Pinout Configuration:

Pin	Name	Description
1	Enable / Key	Toggle between Data and Command mode (High = AT Mode)
2	Vcc	+5V Power Input
3	Ground	System ground
4	TX	Transmits serial data
5	RX	Receives serial data
6	State	Connected to onboard LED (shows connection status)
7	LED	Blink once in 2s = Command Mode Repeated blinking = Waiting for connection Blink twice in 1s = Connected
8	Button	Toggle between Data and Command mode

How to Use:
Power the HC-05 with 5V and connect it to your microcontroller via UART: TX (module) → RX (MCU), RX (module) ← TX (MCU, use voltage divider if needed). Use the **KEY pin** to enter AT Command Mode on startup. When powered on, search for **“HC-05”** on your phone or PC, connect using password **1234**, and begin communication at **9600 baud**. To configure the module (name, password, role), enter AT mode and use AT commands via Serial Monitor.

Using Purposes:

• Wireless communication between two microcontrollers
• Bluetooth control using phones or laptops
• Wireless robots and RC cars
• Data logging via Bluetooth
• DIY IoT and home automation projects

Please Note: Product information has been collected from various sources across the web. While we have made every effort to ensure the accuracy of the information presented, slight variations may still occur. Kindly verify the specifications and compatibility before using this product.