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Arduino HC-05 Bluetooth Module Guide

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Introduction and Features: HC-05 is a low-cost Bluetooth module for Arduino projects
Module enables wireless control of Arduino projects
Can act as both master and slave Bluetooth device
Hardware Setup: Requires Arduino UNO, HC-05 module, USB cable, and Dupont wires
Connects via TXD to RXD, TXD to RXD, and 5V to VCC
STATE pin indicates Bluetooth connection status
KEY pin controls module's data/command mode
Project Examples: LED blinking project demonstrates basic Bluetooth control
Module can be renamed using AT commands
Works with Arduino Mega board using same code
Bluetooth can control Arduino via smartphone apps
Technical Details: Uses UART-style communication protocol
Default baud rate is 38400
STATE pin connected to onboard LED
KEY pin controls module's command mode