Interfacing of Keypad with PIC Microcontroller

Hello everyone, I hope you all are doing great. Today, I am going to share a very basic tutorial on PIC Microcontroller, which is Interfacing of Keypad with PIC Microcontroller. I have designed this simulation of Keypad with PIC Microcontroller in Proteus ISIS and the simulation along with code is given below for download. But I would suggest you to read it first and then design it on your own so that you learn most out of it.

In today's tutorial, I am not gonna discuss the details of How keypad works because I have discussed it in detail in my old tutorial Interfacing of Keypad with Arduino so if you don't have much idea about working of keypad then I would recommend you to read that tutorial first, before proceeding with today's tutorial. I have also interface this Keypad with 8051 Microcontroller, so today we are gonna interface this keypad with PIC Microcontroller. I have written programming code for this project in MikroC Pro For PIC. So, let's get started with Interfacing of Keypad with PIC Microcontroller:

Interfacing of Keypad with PIC Microcontroller

• First of all, you can download the Simulation for this project along with programming code by clicking the below button:

Download Code & Simulation

• Now, let's design it step by step.
• I have used LCD Library for Proteus so download it first and then run this simulation.
• First of all, design a simple simulation in Proteus software as shown in below figure:

• Now paste the below programming code in MikroC Pro For PIC.
• In this Programming code, the key pressed on keypad will be displayed on the LCD.
• So, when you press any button on the keypad, it will appear on the LCD.
• Here's the code which you need to use in MikroC Pro For PIC:

unsigned short kp, cnt, oldstate = 0;
char txt[6];

char  keypadPort at PORTD;

sbit LCD_RS at RB0_bit;
sbit LCD_EN at RB1_bit;
sbit LCD_D4 at RB2_bit;
sbit LCD_D5 at RB3_bit;
sbit LCD_D6 at RB4_bit;
sbit LCD_D7 at RB5_bit;

sbit LCD_RS_Direction at TRISB0_bit;
sbit LCD_EN_Direction at TRISB1_bit;
sbit LCD_D4_Direction at TRISB2_bit;
sbit LCD_D5_Direction at TRISB3_bit;
sbit LCD_D6_Direction at TRISB4_bit;
sbit LCD_D7_Direction at TRISB5_bit;


void main() {
  cnt = 0;
  Keypad_Init();
  Lcd_Init();
  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Cmd(_LCD_CURSOR_OFF);
  Lcd_Out(3, 2, "The Engineering");
  Lcd_Out(4, 5, "Projects");
   Lcd_Out(1, 1, "Key Pressed:");

  do {
    kp = 0;
    do
      kp = Keypad_Key_Click();
    while (!kp);
    
    switch (kp) {
      case 10: kp = 42; break;  // '*'
      case 11: kp = 48; break;  // '0'
      case 12: kp = 35; break;  // '#'
      case  1: kp = 49; break; // 1
      case  2: kp = 50; break; // 2
      case  3: kp = 51; break; // 3
      case  4: kp = 65; break; // A
      case  5: kp = 52; break; // 4
      case  6: kp = 53; break; // 5
      case  7: kp = 54; break; // 6
      case  8: kp = 66; break; // B
      case  9: kp = 55; break; // 7
      case 10: kp = 56; break; // 8
      case 11: kp = 57; break; // 9
      case 12: kp = 67; break; // C
      case 13: kp = 42; break; // *
      case 14: kp = 48; break; // 0
      case 15: kp = 35; break; // #
      case 16: kp = 68; break; // D

    }

    Lcd_Chr(1, 14, kp);
  } while (1);
}

• Now get your hex file and upload it in your Proteus Simulation.
• Run your simulation and if everything goes fine then you will get results as shown in below figure:

• So, in the above figure, I have pressed button 5 on the keypad and it is shown on the LCD.
• Here's the video demonstration which will help you better in understanding this project:

So, that's how we can interface our Keypad with PIC Microcontroller. If you got into any trouble following this tutorial then ask your problems in the comments and I will help you out. That's all for today, I hope you guys can now interface keypad with PIC Microcontroller easily. :)