![]() ![]() It means you don’t have to use the SoftwareSerial function. Note: Arduino Mega has more than one serial port. Make sure the serial pins are appropriately mapped. You can use the code above and still make the project work. There is no difference in how the code behaves when you connect Arduino Mega instead of an Arduino UNO to the HC-05. In this project, you can upload the new sketch to your Arduino without connecting the Arduino to the computer.Ī very helpful use-case when Arduino is already installed into a device, and there is no possibility to connect Arduino directly to the PC.Ī must-try! FAQs About The Arduino and HC-05 Bluetooth module Connection How to connect Arduino Mega to HC-05? 9600 is the baud rate corresponding to the Arduino serial port (not the Bluetooth serial port). You must set the option as shown in the image below (select Both “NL and CR”). Open the serial terminal in the Arduino IDE. I will show you how to frame and send the commands in the following steps. Once you put the HC-05 into command mode, you can start sending the AT commands. BTSerial.begin(38400) // HC-05 default speed in AT command mode PIN 9 of the Arduino is connected to the KEY pin of the HC-05 module. Writing HIGH to the PIN 9 puts the HC-05 into command mode. I will highlight the key sections of the code. Read from serial monitor and send to HC05 SoftwareSerial BTSerial(10, 11) // RX | TXīTSerial.begin(38400) // HC-05 default speed in AT command mode ![]() * Changing HC05 module's default device name using AT Command The first line activates the hardware serial port on the UNO. You will toggle the LED using a Bluetooth serial app on the phone. The LED is connected to PIN 8 of the Arduino. The flag is a variable used to store the input from Bluetooth. Serial.println("Ready to connect\nDefualt password is 1234 or 000") ģ) Code walkthrough SoftwareSerial MyBlue(2, 3) // RX | TXĪn object named MyBlue is created using the SoftwareSerial library. You can use AT commands to put the HC-05 module in the master mode. HC-05 Module can act like a Master as well as a slave. I will share with you more details about the AT modes and the KEY pin functionality in the sections below. It will be low when it si not connected to any device. The STATE pin will be high when it is connected to a Bluetooth device. The STATE pin tells the Arduino UNO whether the HC-05 is connected to a Bluetooth device or not. ![]() The KEY pin enables you to put the HC-05 Bluetooth module in AT command mode. Connect TXD Pin of the MCU (Arduino UNO PIN 1) You will send the commands to the module via this RXD pin. Connect the TXD pin of HC-05 to the RXD pin of the MCU (Arduino UNO PIN 0) TXD is the transmit pin of the Bluetooth module. This can be connected to the GND pin on the Arduino UNO GND pin of the HC-05 should be connected to the ground connection of your project. You can connect 5 V from the Arduino UNO to this pin. This is the Power supply pin of the module. I will show you the HC-05 pins and the descriptions in the table below: Sl. ![]()
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