Controlling The LCD Display By Using BlueTooth (HC05)

Introduction

In this article, I will explain about controlling the LCD display by using BlueTooth (HC05). It will control and display the name that we have set in our mobile phone. And, I will show the demo of how it works.

 

List of Parts

Hardware Parts

• Arduino Uno
• Potentiometer
• Bread Board
• Resistor
• BlueTooth (HC05).
• Mobile Phone 
• Hook up wires 

Software Required

• Arduino IDE
• Android App. 

Parts Explanation

BlueTooth HC05

• The BlueTooth HC05 is used to communicate the message from Arduino to mobile phone.
• It is a wireless device to send the message clearly.
  
  Figure1 - HC05

Connection

Arduino To  Bluetooth Module(HC05)

• In the Bluetooth, the Vcc should be connected to the 5v supply of the Arduino board.
• In the Bluetooth, the Gnd should be connected to the Gnd supply of the Arduino board.
• In the Bluetooth, the Tx should be connected to the Rx of the Arduino board.
• In the Bluetooth, the Rx should be connected to the Tx of the Arduino board. 

LCD Display To Arduino Uno

• Fix the LCD in 16 to 2 of the bread board.
• The 16 pin to the Gnd.
• The 15 pin to the Vcc.
• The 14 pin to the Digital pin 12.
• The 13 pin to the Digital pin 11.
• The 12 pin to the Digital pin 05.
• The 11 pin to the Digital pin 04.
• The 01 pin to the Gnd.
• The 02 pin to the Vcc.
• The 03 pin to the potentiometer.
• The 04 pin to the Digital pin 03.
• The 05 pin to the Gnd.
• The 06 pin to the Digital pin 02.
  
  Figure 2 - LCD Display

Potentiometer To LCD Display

• Connect the Arduino board to the LCD display as per the preceding figure.
• The Vin should be connected to the LCD display in 03. 

Programming For LCD Coding

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
String readString;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
}

void loop() {
  while(Serial.available()){
    delay(50);
    char c=Serial.read();
    readString+=c;
  }
  if(readString.length()>0){
    Serial.println(readString);
    if (readString =="button_1"){
      lcd.clear();
      lcd.print("Mert Arduino");
    }

    if (readString =="button_2"){
      lcd.clear();
      lcd.print("Hello World");
    }

    if (readString =="button_3"){
      lcd.clear();
      lcd.print("Please Subscribe");
    }

    if (readString =="button_4"){
      lcd.clear();
      lcd.print("Youtube Channel");
    }
    readString="";
  }
}

Explanation

• It will be used to display the LCD connection by the above code that is uploaded to the Arduino Board.
• It will simply connect and switch ON the LCD display.
• The potentiometer is used to display and adjust.
• Then we can upload the bluetooth coading what we have done in the MIT App Inverter.
• In the  MIT App Inverter we can set the 4 button and Save the program.

OUTPUT

 

Figure 4 - Output1 

 

Figure 5 - Output 2