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Counting the number of times pressed of Switch , C program in MPLAB X

In this program we are going to count the number of times a switch pressed,and displaying it on a LCD .. and each time the switch pressed a LED will lighted up.

First create a new project and add a c main file like in the steps for Blinking a LED using MPLAB X , PIC16F877A

Components

1. PIC16F877A micro controller
2. animated LED
3. A toggle switch
4.16x2 LCD display

Steps in the program

1. define the ports for easy usage

Defines the control pins of LCD to the 0th,1st and 2nd pin of PORT D
#define RS RD0
#define RW RD1
#define EN RD2
Defines the data port of the LCD to PORT B
#define DATA PORTC
Defines switch in the 0th pin of PORT C
#define S RC0
Defines LED on the 3rd pin of PORT D
#define L RD3

2. Function declarations .. here we declare 3 functions and all the 3 functions is for LCD

void LCD_CMD(unsigned int value); //This function is pass the LCD commands

void LCD_DAT(unsigned int value); // this is for pass the DATA to the LCD which is to displayed

void LCD_INIT(); //this to initialize the LCD

void delay(); // this is to delay the LCD commands

for more refer the Interfacing LCD with PIC16F877A in MPLAB X

3. next is main function .. in main function we make

PORT C as input where we have connected the switch
PORT D as output where we have connected the LED and control pins of LCD
PORT B as outout where we have connected DATA pins of LCD

TRISC =0x0F;

TRISD =0x00;

TRISB = 0x00;

4. The function LCD_INIT(); is called for initializing the LCD

5. Declared a variable called count, and initialized it to zero

int count;

count=0;

6. we put the LED off

7. now we are going for a infinite loop by

while(1)

{

}

8. In the loop we are checking switch is ON or OFF condition

if the switch is ON ; LED is on and count is incremented by 1 and display the value of count in LCD

if the Switch is OFF it wait for the condition when the Switch is ON

schematic diagram

full Program

###################################################################################

* File: switchcount.c
* Author: Ebin Ephrem

*/

#include<htc.h>

__CONFIG(0x193A);

#define RS RD0

#define RW RD1

#define EN RD2

#define DATA PORTB

#define S RC0

#define L RD3

void LCD_CMD(unsigned int value);

void LCD_DAT(unsigned int value);

void LCD_INIT();

void delay();

void main(void)

{

TRISC =0x0F;

TRISD =0x00;

TRISB = 0x00;

LCD_INIT();

int count;

count=0;

L=0;

while(1)

{

if( S == 1)

{

while(S==1);

L= ~L;

count = count+1;

LCD_CMD(0x01);

delay ();

LCD_DAT('0' + (count % 10));

}

void LCD_INIT()

{

LCD_CMD(0x01);

delay ();

LCD_CMD(0x38);

delay ();

LCD_CMD(0x0F);

delay ();

LCD_CMD(0x06);

delay ();

LCD_CMD(0x0c);

delay ();

LCD_CMD(0x80);

delay ();

}

void LCD_CMD(unsigned int value)

{

DATA = value;

RS=0;

RW=0;

EN=1;

delay ();

EN=0;

delay ();

}

void LCD_DAT(unsigned int value)

{

DATA= value ;

RS=1;

RW=0;

EN=1;

delay ();

EN=0;

delay();

}

void delay(void)

{

int counter = 0;

for (counter = 0; counter<1000; counter++) {

;

}

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