Thursday, December 04, 2014

Lcd 16x2 Display Interfacing with Pic Microcontroller [step by step]

Lcd 16x2 Display  Interfacing
Lcd 16x2 Display  
In this tutorial, I will show how to interface LCD display with pic18f2550 microcontroller.
Generally, LCD display has 16 pins. 16x2 means the display has 12 column and 2 row.

The picture given below shows about rows and columns.


The picture is given below discuss each pin.

 Proteus Project :

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








According to the instruction pick  '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 Display  Interfacing with Microcontroller [step by step]
Lcd 16x2 Display  Interfacing with Microcontroller [step by step]


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

MikroC Source Code :





MikroC LCD Library :
  1. Lcd_Init             
  2. Lcd_Out      
  3. Lcd_Out_Cp
  4. Lcd_Chr
  5. Lcd_Chr_Cp
  6. Lcd_Cmd
Description :
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_Out_Cp :  Prints text on Lcd at the current cursor position. Both string variables and literals can be passed as a text.

4.Lcd_Chr :  Prints character on Lcd at a specified position. Both variables and literals can be passed as a character. Parameters :
  1. row: writing position row number
  2. column: writing position column number
  3. out_char: character to be written


5.Lcd_Chr_Cp : Prints character on Lcd at the current cursor position. Both variables and literals can be passed as a character.
 6.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 .
Source Code :
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////



sbit LCD_RS at LATB7_bit;
sbit LCD_EN at LATB6_bit;
sbit LCD_D4 at LATB5_bit;
sbit LCD_D5 at LATB4_bit;
sbit LCD_D6 at LATB3_bit;
sbit LCD_D7 at LATB2_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

void main(){
  ADCON1=0x0F;            // Disable Analog to Digital Converter
  CMCON=7;                    // Disable Comparator

  Lcd_Init();                        // Initialize Lcd
      while(1){
  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off
  Lcd_Out(1,1,"Microcontroller");
  Lcd_Out(2,4,"Tutorial");                         // Write text in first row
  delay_ms(400);
  }
}

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


 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 Display  Interfacing with Microcontroller [step by step]
Lcd 16x2 Display  Interfacing with Microcontroller [step by step]


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

Thank You !

Create Blinking LED Project Using PIC Microcontroller [ PIC18F2550 ] [ step by step ]


Hi,
If you are a beginner  , it is perfect to start with blinking led .This is a very simple project and we need 7 LED and PIC 18F2550 microcontroller .In this project we will use MikroC compiler  to code.


Now we are going to Create this project  >>

Proteus Project  :



*Open Proteus and Create new project 

 You will see as below :
 

 After finishing those step ,You need to follow as below:



Pick all parts from library :

 


In  this way , pick from Library  "PIC 18F2550", "crystal" , " 22pf capacitor" , "green LED" ,"Power" and "Ground" .

 [ Note :If  you are absolutely a new with PIC 18f2550 microcontroller , you need to see Introduction with PIC 18f2550  to understand all ports and pin]
Create  Blinking LED Project Using PIC Microcontroller [ PIC18F2550 ]  [step by step ]
Create  Blinking LED Project Using PIC Microcontroller [ PIC18F2550 ]  [step by step ]



Now  we need the main hex file to operate .Here you need to take a look on here , we selected RB0-RB7 pins and made connection with GND port of  each LED .So if portB is 1 , those LED will be on .


MikroC Code :

Open MikroC and Create a new Project :








Now Write the source code given below :
Source Code
//////////////////////////////////////////////////////////////////////

void main(){
TRISB=0x00;
while(1){
 PORTB=0x01;
 delay_ms(400);
  PORTB=0x02;
 delay_ms(400);
   PORTB=0x04;
 delay_ms(400);
      PORTB=0x08;
 delay_ms(400);
      PORTB=0x10;
 delay_ms(400);
   PORTB=0x20;
 delay_ms(400);
    PORTB=0x40;
 delay_ms(400); 
 PORTB=0x80;
 delay_ms(400);
 }  }
////////////////////////////////////////////////////////////////////

TRISB is used for selecting PORTB as Input or Output . Here  1 for input and 0 for Output .
If we write TRISB=0xFF; and 0xFF will be in binary "11111111" .By applying this we get portb for input .
 If we write TRISB=0x00; and 0xFF will be in binary "00000000" .By applying this we get portb for output.  [if  you don't understand pinout of PIC 18f2550 please follow the link]
We used delay_ms(400) function .That means microcontroller stop for 400ms .
0x01 is hexadecimal number and in binary "00000001" .Means first pin or RB0 pin of  PORTB will be 1 .In this condition 1 means this pin gets +5v[VDD] and 0 means ground(GND) .It is said computer understand 0 and 1 .But it is just an electronic device which calculate something according to instruction.

So,
 0x00 <--------------> "all zero" <--------------> RB0,RB1,RB2,RB3,RB4,RB5,RB6,RB7 remain OFF
 0x01 <--------------> "00000001" <--------------> Only RB0 is +5v & allothers remain GND 
 0x02 <--------------> "00000010" <--------------> Only RB1 is +5v & all others remain GND  
 0x04 <--------------> "00000100" <--------------> Only RB2 is +5v &all others remain GND 
 0x08 <--------------> "00001000" <--------------> Only RB3 is +5v &all others remain GND  
 0x10 <--------------> "00010000" <--------------> Only RB4 is +5v &all others remain GND 
 0x20 <--------------> "00100000" <--------------> Only RB5 is +5v &all others remain GND 
 0x40 <--------------> "01000000" <--------------> Only RB2 is +5v &all others remain GND  
 0x80 <--------------> "10000000" <--------------> Only RB2 is +5v &all others remain GND 
Why  TRISB ?
Listen , A microcontroller can be used for many purposes and the specific purpose we need can be defined by the source code  . Basically in blinking led , each led will be on or off   in one after one way .That means each pin of PORTB will be on or off .For this purpose we need to initialize PORTB as output.
So we have to use TRISB to define PORTB as Input or Output .
When TRISB=0x00; all pins for OUTPUT.
When TRISB=0xFF; all pins for INPUT.
If in case PORTA , we will have to use TRISA .





Thank You!


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