Arduino Bluetooth Module HC-05

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Arduino Bluetooth Module HC-05 is a popular and reliable Bluetooth communication module based on the Bluetooth 2.0 + EDR standard. It enables wireless serial communication between microcontrollers and external devices such as smartphones, laptops, and tablets. The module communicates using UART (TX/RX), making it easy to interface with Arduino, ESP32 (via UART), and other development boards.

One of the key features of the HC-05 module is its ability to operate in both Master and Slave modes, which allows flexible wireless communication setups. The module can be configured using AT commands to change baud rate, device name, password, and operating mode.

HC-05 is widely used in wireless robotics control, Bluetooth-based automation systems, remote monitoring, and IoT prototype projects. Due to its stable connection, ease of configuration, and wide community support, it is suitable for students, hobbyists, and professionals working on wireless electronics projects.

🔹 Key Technical Information (Important)

Module Type: Bluetooth Serial Module
Bluetooth Version: 2.0 + EDR
Operating Modes: Master & Slave
Communication Interface: UART (TX, RX)
Default Baud Rate: 9600 bps (Data Mode)
Operating Voltage: 3.6V – 6V (onboard regulator)
Logic Level: 3.3V (RX pin)
Configuration: AT Command Mode

🔹 Common Applications

Arduino Bluetooth control projects
Wireless robot and car control
Mobile app-based automation
Wireless data transfer systems
Smart home and IoT prototypes
Electronics learning and training kits

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