16F877A Switch controlled LED.

Hi all,

I'm learning the basic microcontroller, i want to make LED lights on and off, controlled by the switch. I chose RA0 as the input and the output RD0-RD7, but it does not work, I use mplab and Hitech c compiler. If there can give me an example code for testing purposes, assistance from you all very much appreciated.

Post the code that you tried with.

You would normally only have one output, not the whole of Port D.

You could try flashing the LED to start with.

This code.

#include <pic.h>
#include <htc.h>
__CONFIG(0x3F32);
#define PB1 RB0
#define LED PORTD
#define _XTAL_FREQ 20000000

void pic_init();
main()
{int i;
pic_init();
for(;{
LED=0b11111111;
__delay_ms(300);
LED=0b00000000;
__delay_ms(300);
LED=0b00011000;
__delay_ms(300);
LED=0b00100100;
__delay_ms(300);
LED=0b01000010;
__delay_ms(300);
LED=0b10000001;
__delay_ms(300);
LED=0b01000010;
__delay_ms(300);
LED=0b00100100;
__delay_ms(300);
LED=0b00011000;
__delay_ms(300);
LED=0b00000000;
__delay_ms(300);

}
}

void pic_init(){
TRISA=0b00000000;
TRISB=0b00000011;
TRISC=0b00000000;
TRISD=0b00000000;
TRISE=0b00000000;
ADCON1=0b0000110;
PORTA=0b00000000;
PORTB=0b00000000;
PORTC=0b00000000;
PORTD=0b00000000;
PORTE=0b00000000;}

Your code shows all of PORTA set as outputs, and RB0 and RB1 set as inputs. This is at odds with you expecting to use RA0 as an input.

You might want to start with some basic tutorials, like Nigel's...see the Sticky at the top of the forum.