In Focus

Controlling The LCD Display By Using BlueTooth (HC05)

In this article, I will explain about controlling the LCD display by using BlueTooth(HC05). It will control and display the name which we have set in our mobile phone.

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
  1. #include <LiquidCrystal.h>  
  2.   
  3. LiquidCrystal lcd(12, 11, 5, 4, 3, 2);  
  4. String readString;  
  5.   
  6. void setup() {  
  7.   Serial.begin(9600);  
  8.   lcd.begin(16, 2);  
  9. }  
  10.   
  11. void loop() {  
  12.   while(Serial.available()){  
  13.     delay(50);  
  14.     char c=Serial.read();  
  15.     readString+=c;  
  16.   }  
  17.   if(readString.length()>0){  
  18.     Serial.println(readString);  
  19.     if (readString =="button_1"){  
  20.       lcd.clear();  
  21.       lcd.print("Mert Arduino");  
  22.     }  
  23.   
  24.     if (readString =="button_2"){  
  25.       lcd.clear();  
  26.       lcd.print("Hello World");  
  27.     }  
  28.   
  29.     if (readString =="button_3"){  
  30.       lcd.clear();  
  31.       lcd.print("Please Subscribe");  
  32.     }  
  33.   
  34.     if (readString =="button_4"){  
  35.       lcd.clear();  
  36.       lcd.print("Youtube Channel");  
  37.     }  
  38.     readString="";  
  39.   }  
  40. }  
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