Interfacing 16*2 LCD with PIC16f877

Today I will interface 16*2 LCD with PIC16F877. This is a very popular microcontroller. In this tutorial we will use the following Software:

   1. MikroC pro for PIC (student verison)

   2. Proteus 8 professional

   3. PicKit 2

MikroC pro for PIC will be used for writing and compiling the code. Here we will use C language.

Proteus 8 professional will be used for the simulation and finally Pickit 2 will be used for burning the hex file in the PIC16F877  IC.

 16*2 LCD has 16 columns and 2 rows. To do this project we need following components: 

  1. PIC16F877

  2. 16*2 LCD

  3. 5V power source

  4. 16 MHz Crystal Oscillator

  5. Male header (to solder with LCD)

  6. 10K potentiometer (To control the brightness of the LCD)

  7. Breadboard

  8. Wires

LCD has 16 pins. We can transfer the data from microcontroller to LCD in 8 bits mode or in 4 bit modes. In this project we will transfer the data in 4 bit modes. In below I have given the pin out of 16*2 LCD.

  Pin 1  : GND

  Pin 2  : VCC

  Pin 3  : VEE

  Pin 4  : RS

  Pin 5  : R/W

  Pin 6  : EN

  Pin 7  : DB0

  Pin 8  : DB1

  Pin 9  : DB2 

  Pin 10: DB3

  Pin 11: DB4

  Pin 12: DB5

  Pin 13: DB6

  Pin 14: DB7

  Pin 15: Led +

  Pin 16: Led -

Figure 1

MikroC has some built in library to print the string in the LCD. In this code part we will demonstrate how to print something on the LCD. Following code will demonstrate how to print something on the LCD.

/*

Project Name: Showing name on LCD using PIC16F877

*/

// LCD connections

sbit LCD_RS at RD0_bit;

sbit LCD_EN at RD1_bit;

sbit LCD_D4 at RD2_bit;

sbit LCD_D5 at RD3_bit;

sbit LCD_D6 at RD4_bit;

sbit LCD_D7 at RD5_bit;

sbit LCD_RS_Direction at TRISD0_bit;

sbit LCD_EN_Direction at TRISD1_bit;

sbit LCD_D4_Direction at TRISD2_bit;

sbit LCD_D5_Direction at TRISD3_bit;

sbit LCD_D6_Direction at TRISD4_bit;

sbit LCD_D7_Direction at TRISD5_bit;

// End LCD connections

void main()

{

   Lcd_Init();                            // Initialize LCD

   Lcd_Cmd(_LCD_CLEAR);                   // Clear display

   Lcd_Cmd(_LCD_CURSOR_OFF);              // Cursor off

   Lcd_Out(1,1,"  Hello WORLD   ");

   Lcd_Out(2,1," ARTECH-AHAMOD  ");

}

I have written another code which will scroll the lcd from left to right and again scroll from right to left. The code is given below:

/* 

Project Name: Showing name on LCD using PIC16F877

*/

// LCD connections

sbit LCD_RS at RD0_bit;

sbit LCD_EN at RD1_bit;

sbit LCD_D4 at RD2_bit;

sbit LCD_D5 at RD3_bit;

sbit LCD_D6 at RD4_bit;

sbit LCD_D7 at RD5_bit;

sbit LCD_RS_Direction at TRISD0_bit;

sbit LCD_EN_Direction at TRISD1_bit;

sbit LCD_D4_Direction at TRISD2_bit;

sbit LCD_D5_Direction at TRISD3_bit;

sbit LCD_D6_Direction at TRISD4_bit;

sbit LCD_D7_Direction at TRISD5_bit;

// End LCD connections

 unsigned int i;

void main()

{

   Lcd_Init();                            // Initialize LCD

   Lcd_Cmd(_LCD_CLEAR);                   // Clear display

   Lcd_Cmd(_LCD_CURSOR_OFF);              // Cursor off

   Lcd_Out(1,1,"  Hello WORLD   ");

   Lcd_Out(2,1," ARTECH-AHAMOD  ");

   delay_ms(3000);

   

   while(1) 

   {                                      // Endless loop

    for(i=0; i<8; i++) 

    {                                     // Move text to the left 7 times

      Lcd_Cmd(_LCD_SHIFT_LEFT);

      delay_ms(500);

    }

    for(i=0; i<8; i++) 

    {                                     // Move text to the right 7 times

      Lcd_Cmd(_LCD_SHIFT_RIGHT);

      delay_ms(500);

    }

    

    delay_ms(2000);

  }

}

Circuit diagram is given below:

Figure 2

Figure 3

Please don't forget to connect pin 1,11 and 32 to 5V source.
Connect pin 12 and 31 with Gnd. Also connect 16 MHz oscillator with pin 13 and 14.

Pin 15 and pin 16 are backlight power of the LCD. Connect pin 15 with 5V and connect pin 16 with Gnd.

THANKS A LOT.