Saturday, December 06, 2014

Lcd 16x2 Scrolling Display Using PIC Microcontroller [Step by Step]



In this tutorial , i will show how to make a Scrolling Display using LCD and PIC18F2550 .
Generally LCD display has 16 pins . 16x2 means the display has 12 columns and 2 rows .

The picture given below shows about rows and columns .
 Lcd_Cmd(_LCD_SHIFT_RIGHT);
Lcd 16x2 Scrolling Display Using PIC Microcontroller



The picture given below discuss about each pin .
Lcd 16x2 Scrolling Display Using PIC Microcontroller

 Proteus Project :

Now we are going to create a new project in Proteus and follow instructions given below :


Lcd 16x2 Scrolling Display Using PIC Microcontroller








According to instruction pick from library 'pic18f2550' , crystal, 22pf capacitor, 5Kohm variable resistor ,power and ground. For lcd display please type "LM016L" on keywords .
In this tutorial we will use 4 data pin [D4-D7] .Now complete the circuit as given below :
Lcd 16x2 Scrolling Display Using PIC Microcontroller [Step by Step]


We have completed the circuit .Now we need the source hex file .So create a new project in MikroC and follow the instructions:

MikroC Source Code :






Required MikroC LCD Library Functions :

1.Lcd_Init   :  Initializes Lcd module.
2.Lcd_Out  :  Prints text on Lcd starting from specified position. Both string variables and literals can be passed as a text.
Parameters :
  1. row: starting position row number
  2. column: starting position column number
  3. text: text to be written

3.Lcd_Cmd :   Sends command to Lcd.
a)     Lcd_Cmd(_LCD_SHIFT_RIGHT)  :This function is used for shifting on the right hand side .
          Lcd_Cmd(_LCD_SHIFT_RIGHT);
 Lcd_Cmd(_LCD_SHIFT_RIGHT);

b)     Lcd_Cmd(_LCD_SHIFT_LEFT)  :This function is used for shifting on the left hand side.
c)     Lcd_Cmd(_LCD_CURSOR_OFF) : This function is used for setting the cursor off .
d)     Lcd_Cmd(_LCD_CLEAR) :To Clear the lcd .
 Lcd_Cmd(_LCD_SHIFT_RIGHT);
 Lcd_Cmd(_LCD_SHIFT_RIGHT);

Source Code :

  // 
 sbit LCD_RS at RB7_bit;  
 sbit LCD_EN at RB6_bit;  
 sbit LCD_D4 at RB5_bit;  
 sbit LCD_D5 at RB4_bit;  
 sbit LCD_D6 at RB3_bit;  
 sbit LCD_D7 at RB2_bit;  
 sbit LCD_RS_Direction at TRISB7_bit;  
 sbit LCD_EN_Direction at TRISB6_bit;  
 sbit LCD_D4_Direction at TRISB5_bit;  
 sbit LCD_D5_Direction at TRISB4_bit;  
 sbit LCD_D6_Direction at TRISB3_bit;  
 sbit LCD_D7_Direction at TRISB2_bit;  
 // End LCD module connections  
  char txt1[]=" Moving Right";  
  char txt2[]="  Moving Left";  
  int i=0,j=0;  
 void main() {  
  ADCON1=0x0F;  
  CMCON=7;  
  Lcd_Init();  
   Lcd_Cmd(_LCD_CLEAR);        // Clear display  
  Lcd_Cmd(_LCD_CURSOR_OFF);  
    while(1){  
    for(i=0;i<20;i++){  
   Lcd_Out(1,1,txt1);  
     Lcd_Cmd(_LCD_SHIFT_RIGHT);  
      delay_ms(200);  
     }  
       Lcd_Cmd(_LCD_CLEAR);  
     for(j=0;j<20;j++){  
   Lcd_Out(2,1,txt2);  
     Lcd_Cmd(_LCD_SHIFT_LEFT);  
      delay_ms(200);  
     }  
  }  
 }  


//////////////////////////////////////////////////////


 Now create a hex file with MikroC .Please follow the instructions :

Now go to the hardware and make double click on the Microcontroller  .Please follow the instructions:




Lcd 16x2 Scrolling Display Using PIC Microcontroller [Step by Step]

Lcd 16x2 Scrolling Display Using PIC Microcontroller [Step by Step]
Lcd 16x2 Scrolling Display Using PIC Microcontroller [Step by Step]

I was just trying to make something good for beginner .If i made something wrong ,forgive me .

Thank You !


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