This code configures an ADC to read an analog signal from channel 0, converts it to a digital value, displays the value on an LCD, and sets the state of PORTB pins based on whether the value is below 25, between 20-25, or above 25. It initializes the ADC and LCD, sets an infinite loop to continuously read the ADC value and check/display the condition.

1. #include <16F877A.h>
#device adc=10
#fuses XT,NOWDT
#use delay(clock=4000000)
#include <LCD.C>
#BYTE TRISB = 0x86
#BYTE PORTB = 0x06
void main(){
int16 q;
int16 p;
TRISB = 0X00;
setup_adc_ports(AN0); //canal 0 analogico
setup_adc(ADC_CLOCK_INTERNAL); //fuente de reloj RC
lcd_init();
PORTB = 0X00;
while(1){
set_adc_channel(0); //habilita canal 0
delay_us(20);
q=(read_adc()-516)/1.75;
p=q;
printf(lcd_putc, "fADC = %4ld",p);
if(p<25){
if(p>20){
printf(lcd_putc, "n En condiciones");
PORTB=0X00;
}
else{
printf(lcd_putc, "n Muy Frio");
PORTB = 0X0F;
}
}
else{
printf(lcd_putc, "n Muy Caliente");
PORTB = 0XF0;
}
delay_ms(100);
}
}