Meu primeiro projeto, feito em 2012: Termômetro Digital

projeto_termometro_digital.c

//Pinos do LCD
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;
sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;

unsigned long value;
unsigned char d1, d2, d3, d4;

void Print() {
  Lcd_Out(2, 1, "Temperatura: ");
  Lcd_Chr_CP(d1 + 48);
  Lcd_Chr_CP(d2 + 48);
  Lcd_chr_CP(d3 + 48);
  Lcd_chr_CP(44);
  Lcd_chr_CP(d4 + 48);
}

void main() {
  TRISA = 0xFF;
  TRISB = 0b11000000;
  Lcd_Init();
  Delay_ms(100);
  Lcd_Cmd(_LCD_CURSOR_OFF);
  Lcd_Out(1, 3, "MICROCONTROLANDOS");
  
  while (1) {
    value = ADC_Read(0);
    value = (value * 500 / 1023) * 10;
    //Celsius
    if (PORTB.F6 == 0 && PORTB.F7 == 0) {
      d1 = value / 1000;
      d2 = (value % 1000) / 100;
      d3 = ((value % 1000) % 100) / 10;
      d4 = ((value % 1000) % 100) % 10;
      Print();
      Lcd_chr_CP(223);
      Lcd_Out_CP("C");
    }
    //Fahrenheit
    else if (PORTB.F6 == 0 && PORTB.F7 == 1) {
      value = (value * 1.79) + 32;
      d1 = value / 1000;
      d2 = (value % 1000) / 100;
      d3 = ((value % 1000) % 100) / 10;
      d4 = ((value % 1000) % 100) % 10;
      Print();
      Lcd_chr_CP(223);
      Lcd_Out_CP("F");
    } 
    //Kelvin
    else if (PORTB.F6 == 1 && PORTB.F7 == 0) {
      value = value + 273;
      d1 = value / 1000;
      d2 = (value % 1000) / 100;
      d3 = ((value % 1000) % 100) / 10;
      d4 = ((value % 1000) % 100) % 10;
      Print();
      Lcd_Out_CP("K");
    } 
    //Rankine
    else {
      value = (value * 1.8) + 32 + 460;
      d1 = value / 1000;
      d2 = (value % 1000) / 100;
      d3 = ((value % 1000) % 100) / 10;
      d4 = ((value % 1000) % 100) % 10;
      Print();
      Lcd_chr_CP(223);
      Lcd_Out_CP("R");
    }
    Delay_ms(20);
  }
}