HC-05 Bluetooth Module with Arduino via AT Command Mode

Learn how to use AT commands with the HC-05 Bluetooth Module and an Arduino.

Jul 5, 2023

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Components and supplies

2k ohm resistor

Electrical Cables

1K ohm resistor

Breadboard - 400 contacts

HC-05 Bluetooth Module

Arduino Nano

Apps and platforms

Arduino IDE

Project description

Code

Code to set up AT Commands

cpp

This code is written in and for Arduino not C++.

1#include <SoftwareSerial.h>
2
3SoftwareSerial Bluetooth(10 , 11); //RX, TX
4char c = ' ';
5
6void setup() 
7{
8  Serial.begin(9600);
9  Serial.println("Enter AT Commands!");
10  Bluetooth.begin(38400);
11}
12
13void loop() 
14{
15  if(Bluetooth.available() > 0)
16  {
17    c = Bluetooth.read();
18    Serial.write(c);
19  }
20  if(Serial.available() > 0)
21  {
22    c = Serial.read();
23    Bluetooth.write(c);
24  }
25}

#include <SoftwareSerial.h>

SoftwareSerial Bluetooth(10 , 11); //RX, TX
char c = ' ';

void setup() 
{
  Serial.begin(9600);
  Serial.println("Enter AT Commands!");
  Bluetooth.begin(38400);
}

void loop() 
{
  if(Bluetooth.available() > 0)
  {
    c = Bluetooth.read();
    Serial.write(c);
  }
  if(Serial.available() > 0)
  {
    c = Serial.read();
    Bluetooth.write(c);
  }
}

Downloadable files

Schematic

Bluetooth_AT_Command_Mode.png

List of AT Commands and Explanation

HC-05_ATCommandSet.pdf

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