Introduction

The HC-05 Bluetooth module is a popular wireless communication device that allows microcontrollers like Arduino to communicate with smartphones, computers, and other Bluetooth-enabled devices. It operates on Bluetooth 2.0+EDR (Enhanced Data Rate) and supports serial communication (UART), making it easy to integrate into embedded projects.

HC-05 Module Description

Key Features:

• Supports AT commands for configuration
• Works with Android & PC Bluetooth devices
• Low power consumption
• Easy serial communication

Applications

Connecting HC-05 with Arduino

Arduino Code Example

#include <SoftwareSerial.h>

#define BT_TX 10  
#define BT_RX 11  

SoftwareSerial bluetooth(BT_TX, BT_RX);

void setup() {
  Serial.begin(9600);
  bluetooth.begin(9600);
  Serial.println("Bluetooth Ready!");
}

void loop() {
  if (bluetooth.available()) {
    char received = bluetooth.read();
    Serial.print("Received: ");
    Serial.println(received);
  }
  
  if (Serial.available()) {
    bluetooth.write(Serial.read());
  }
}

AT Command Configuration

Troubleshooting