What are the main Circuite in a thermal power plant?

There are four main circuits:

• Feed water and steam flow circuit.
• Coal and ash circuit.
• Air and gas circuit.
• Cooling water circuit.

Keypad interfacing with PIC microcontroller

Microcontroller: PIC18F452

MikroC Code:

unsigned short kp;

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() 

{

  kp = 0;

  Keypad_Init();

  Lcd_Init();

  Lcd_Cmd(_LCD_CLEAR);

  Lcd_Cmd(_LCD_CURSOR_OFF);

  Lcd_Out(1, 2, "MH Instruments");

  Lcd_Out(2, 1, "Key Pressed:");

  do 

  {

  kp = Keypad_Key_Click();

    switch (kp)

     {                                                //transform key to it's ASCII value

      case  1: kp = 49; break; // 1

      case  2: kp = 50; break; // 2

      case  3: kp = 51; break; // 3

      case  4: kp = 52; break; // 4

      case  5: kp = 53; break; // 5

      case  6: kp = 54; break; // 6

      case  7: kp = 55; break; // 7

      case 8: kp = 56; break; // 8

      case 9: kp = 57; break; // 9

      case 10: kp = 42; break; // *

      case 11: kp = 48; break; // 0

      case 12: kp = 35; break; // #

    }

  Lcd_Chr(2, 14, kp);

  } while (1);

}

https://youtu.be/oGmKMw-sWWo