Overview
Things
Story

Step 1: Components & Requirements
Step 2: Download and Upload the Code
Attachments
Step 3: Power Supply Wire for LCD and Bluetooth Module
Step 4: Connect LCD
Step 5: Connect Bluetooth
Step 6: Connect the Bluetooth
Step 7: Download the App and Connect
Step 8: Now We Are Good to Go

Published May 22, 2019

Bluetooth-Controlled Messenger LCD

You can turn on or off the 16x2 LCD via your smartphone and also you can send the text message over Bluetooth.

BeginnerFull instructions provided21,040

Things used in this project

Hardware components

Arduino UNO

Adafruit RGB Backlight LCD - 16x2

HC-05 Bluetooth Module

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

10 Pc. Jumper Wire Kit, 5 cm Long

Story

Youtube video

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The notice board is used to update peoples with new information or

If you want to send message with in room or in hall but are not want to talk loudly then this project will help you.

The project based on HC-05 Bluetooth module which Controlling 16x2 LCD display.

You can turn on or off the LCD display via smartphone and also you can send the text message.

The project is very simple you can built it without the knowledge of arduino.

Just upload the program and connect the circuit and you are good to Go.

Add TipAsk QuestionCommentDownload

Step 1: Components & Requirements

HC-05 Bluetooth module
16x2 LCD display
Arduino Uno
Some wires/connectors

Add TipAsk QuestionCommentDownload

Step 2: Download and Upload the Code

Download and Upload the Code.

Make sure the Bluetooth mode is not connected to Arduino while uploading the Code.

Attachments

https://github.com/vishalsoniindia/Bluetooth-Controlled-Messenger-LCD-16x2-LCD-Hc05-Simple-Wireless-Notice-Board/archive/master.zip

bluetooth_LCD.inoDownload

Step 3: Power Supply Wire for LCD and Bluetooth Module

Connect 2 red wire to the +5v and 3.3v.
Connect Black Wire to the GND.

Step 4: Connect LCD

2 More Images

Connect LCD to Arduino Like given in Photo, So the A0 pin connected to the 16th Pin of LCD.

16th pin of LED ------> 1st pin of LCD

2nd pin of LCD -------> +5v of Arduino

3rd Pin of LCD --------> GND of Arduino

4rth pin of LCD --------> 5th pin of Arduino

5th pin of LCD ---------> 4rth pin of Arduino

6th pin of LCD ---------> 3rd pin of Arduino

Step 5: Connect Bluetooth

Mine Bluetooth Works on 3.3v to 6v, So I will connect it to 3.3v of Arduino.

Vcc of Bluetooth --------> 3.3v of Arduino

Gnd of Bluetooth --------> Gnd of Arduino

Tx of Bluetooth --------> Rx of Arduino

Rx of Bluetooth ---------> Tx of Arduino

Step 6: Connect the Bluetooth

Connect your Arduino to Power supply

the red LED in Bluetooth will starts fast blinking it means it is not connected to any device.

Turn on the Bluetooth in your device.
Search for new device.
Click on Hc05 once it appear.
Enter the password "1234" or "0000".

2 More Images

Download the app fromhere.
Open the app
Click on connect on the top right.
Click on the Hc05 and connect.

Send "1" to turn on the LCD display.

Send any message to display on LCD.

Send "2" to turn off the LCD display.

Step 8: Now We Are Good to Go

The Project is Ready you can build it for fun or for your school / collage project.

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Code

bluetooth_LCD.ino

#include <LiquidCrystal.h>

char str[34],L=2;
int temp=0,i=0;
int Pass=0,p=0;
 int c,x,d;
const int rs = 5, en = 3, d4 = A5, d5 = A4, d6 = A3, d7 = A2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup()
{
 Serial.begin(9600);
  pinMode(A1,OUTPUT);
  pinMode(A0,OUTPUT);
   pinMode(4,OUTPUT);
   
  digitalWrite(A1,LOW); 
  digitalWrite(A0,LOW); 
   digitalWrite(4,LOW); 
   
  lcd.begin(16, 2);
  
 
}


void loop() 
{ 
  if(temp==1)
  {
    check();
     temp=0;
    i=0;
    delay(1000);
  }
  
}

void serialEvent() 
 {
      while (Serial.available()) 
      {
      char inChar=Serial.read();
      str[i++]=inChar;
      delay(10);
      }
       for (p=i+1;p<34;p++)
      {
        str[i++]=32;
      }
    temp=1;
  Serial.write(str);
  lcd.setCursor(0, 0);
 lcd.print(str);
  if(i>16)
  {
    d=16;
    for (x=0;x<=17;x++)
    {
    lcd.setCursor(x,2);
    lcd.print(str[d]);
    d++;
    }
  }
 }

void check()
{
if(!(strncmp(str,"1",1)))
  {
   digitalWrite(A1,50); 
   lcd.clear(); 
  }
  else if(!(strncmp(str,"2",1)))
  {
   digitalWrite(A1,LOW);
   lcd.clear(); 
  }
}

Credits

Vishalsoniindia

31 projects • 41 followers

I am an electrical engineer⚡🔌 Checkout my Youtube channel

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Bluetooth-Controlled Messenger LCD