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Interfacing DX-BT18 Dual-Mode Bluetooth Module with Arduino

DX-BT18 Bluetooth Module Features

Bluetooth modules are a type of wireless communication modules that can be added to a project through serial or SPI communication protocols.

The advantage of using Bluetooth modules is that they are easy to set up and use.

The DX-BT18 module uses serial protocol for communication.

Note

All Bluetooth modules that use serial communication protocol support AT Commands, which are listed in the datasheet of each product.

Download the datasheet of DX-BT18 module here.

DX-BT18 Bluetooth Module Pinout

This module has 6 pins:

  • VIN: Module power supply – 3.6-6V
  • GND: Ground
  • STATE: Connection State
  • EN: Enable AT Command settings
  • RX: Receive Serial Data
  • TX: Transmit Serial Data

You can see the pinout of this module here.

Required Material

Hardware component

Arduino UNO R3 × 1
DX-BT18 Dual-Mode Serial Bluetooth Module × 1
Male to Female jumper wire × 1

Software Apps

Arduino IDE

Interfacing DX-BT18 Bluetooth Serial Module with Arduino

Step 1: Circuit

The following circuit shows how you should connect the Arduino to the DX-BT18 module. Connect wires accordingly.

Step 2: Library

Install the following library on your Arduino.

https://github.com/PaulStoffregen/SoftwareSerial

Tip

If you need more help with installing a library on Arduino, read this tutorial: How to Install an Arduino Library

Step 3: Code

Upload the following code to Arduino.

  /*
  Modified on March 09, 2021
  Modified by MohammedDamirchi from https://github.com/PaulStoffregen/SoftwareSerial
  
Home
*/ #include <SoftwareSerial.h> SoftwareSerial mySerial(10, 11); // RX, TX void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for native USB port only } // set the data rate for the SoftwareSerial port mySerial.begin(9600); } void loop() { // run over and over if (mySerial.available()) { Serial.write(mySerial.read()); } if (Serial.available()) { mySerial.write(Serial.read()); }

This code is to test the connection between the Arduino serial monitor and the device connected to the Bluetooth module.

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