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Arduino and Bluetooth module [ HC-06 and HC-05 ]

  • Updated on June 3, 2017
wireless display with arduino and bluetooth

Application of Arduino and Bluetooth module in wireless display

In the tutorial, you are going to learn how to send a text message from your smartphone to an LCD display using Arduino and Bluetooth module ( HC-05 or HC-06 ).

Parts we need

  • Arduino
  • LCD display
  • surfboard or PCB
  • Bluetooth (HC-05 or HC-06)
  • soldering iron
  • Preset (variable resistor)
wireless display with arduino and bluetooth

The 16×2 LCD Display is easily available in the market along with Arduino and Bluetooth modules. On the back of the LCD, you can easily see the pin configurations. The schematic of the circuit is shown helps you to understand the connection you are going to make as per the program. Before making the permanent PCB circuit it is better that you test the circuit on the breadboard.

Procedure

The Preset of Variable resistor is being used in order to increase or decrease the brightness or the shading effect of the LCD. The LCDs are very good as they can be used in a better way to display some of the characters including the upper case and the lower case and also the numbers.

The 16×2 LCD display can display about 32 characters at a single time.

Step 1

The center pin of the preset will go to pin 3 of the LCD.

Step 2

For the LED of the LCD, the current limiting resistor is used and the ground pin of the LED’s will go to the ground of the Arduino.

wireless display with arduino and bluetooth hc-05 module
Step 3

For the preset wiring, pin 1 will go to the ground and the other pin will go to the positive. So it will give the output at the center voltage.

Step 4

You are needed to include a liquid crystal library on your computer in order to write a program for the LCD display. You can download the Liquid crystal library from the link below. In most of the Arduino platforms the library may be preinstalled. In that case, you can just include it in your program.

Step 5

Now connect the Arduino to the computer with a USB cable and upload your Arduino program in the Arduino board.

Step 6

Now just hook up the Arduino and Bluetooth TX and RX pins.

Step 7

Now you need to open the Application store for I phone or Play store for android and download the app called Bluetooth terminal or you may download any other Arduino Bluetooth android app as per your preference.

Step 8

You can connect with your Bluetooth module and can send the text and it will display in your LCD display.

You can download the liquid crystal library in order to write the Arduino Bluetooth code below.

Arduino and Bluetooth module Program

#include LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup()

{

lcd.begin(16, 2);

Serial.begin(9600);

}

void loop()

{

if (Serial.available())

{

delay(100);

lcd.clear();

while (Serial.available() > 0)

{

lcd.write(Serial.read());

}

}

}

You can open the serial monitor in the Arduino software and send some text to the Arduino. You can see the text you send will display in the LCD. You can vary the brightness or the shading effect of the LCD display by rotating the Preset (Variable resistor).

More Bluetooth Arduino projects are about to come, You may like to see Distance measurement with Arduino and ultrasonic sensor.

Picture of Farhan Sheikh
Farhan Sheikh
Hi, I’m Farhan Sheikh. I'm an Electrical and Electronics Engineer. On this site, I guide you with different electronic circuits, theories, and how to buy generators for yourself. And yeah, I manage the content planning and editorial of this website. :)

49 thoughts on “Arduino and Bluetooth module [ HC-06 and HC-05 ]”

  26. The project title is may much simple. I suggest you some more justifying title, it really worth it. By the way you’d shown amazing application of arduino, LCD display and Bluetooth module.

    Reply

  33. The code is not working for me, I tried importing liquid crystal library i downloaded, even uploaded the same program as yours but mine isn’t doing any thing as you’d shown in the video.

    Reply

  34. I tried the arduino android bluetooth source code you gave but i had to import the library for bluetooth module in my arduino software. Now its working fine

    Reply

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