Programming PICC through MPLAB

[futz]

Is this normal? 'cause it doesn't seem like it...

Definitely not the way it should be. Double check that all unused pins are set as outputs (or pulled high or low). Make sure your MCLR is pulled high.

 

[MatrixPhreak]

Ok..... So... interesting phenomenon (which is only labeled that because I can't explain it)...

My code is as follows

#include<16f872.h>
#fuses HS,NOWDT,NOPROTECT,PUT
#use DELAY(clock=8000000)
#use fast_io(A)
#use fast_io(B)
#use fast_io(C)

void main(){
   //Now I'm gunna clear all ports just to make sure that they're not interfering
   set_tris_a(0x00);
   set_tris_b(0x00);
   set_tris_c(0x00);
   /*Now gunna initialize the ports in the order I actually need them
   /*As a note, I'm going to do this in binary to make sure ONLY the ports
   /*I need are going to operational
   */
   set_tris_a(0b00000001); //Set PIN_A0 input, all else output
   set_tris_b(0x00);       //Set ALL port B output

while (1)
{
  if (input(PIN_A0))
  {
      output_low(PIN_B6);
  }
  else
  {
      output_high(PIN_B6);
  }
}
}

That's all of it, from directives to final curly brace. I have the board wired up and an LED in place. When I remove all stimulus on pin A0, the LED shines bright with no fluctuations, however, when even just a wire is tied to pin A0, it seems to act as a proximity sensor of some sort O.O The LED turns off whenever anything is moved near it, and the radius seems fairly constant once again.

What did I do? Is it the aliens?

Moreover, how can I make it STOP doing this so I can perhaps finish my project? *sigh*

EDIT: I've tried switching what pin I'm using as input, and the same weird effect occurs

 

[Pommie]

You appear to have A0 floating, that is, not connected to anything. When you place anything near it, it will pick up stray voltages like the mains hum. This is what would be expected.

What did you expect would happen?

Mike.

 

[MatrixPhreak]

You appear to have A0 floating, that is, not connected to anything. When you place anything near it, it will pick up stray voltages like the mains hum. This is what would be expected.

What did you expect would happen?

Mike.

Ok... now I feel like a newbie because, while the words make sense, they don't make sense to me in that order. What would the proper code look like, then? Or is it not a problem with the code and instead a problem with my circuit?

 

[BeeBop]

Yes, it is

not a problem with the code and instead a problem with my circuit?

What they are telling you to do is connect A0 to +5V with a pull-up resistor ~1k to 10k, then connect your switch between A0 and ground. This way the input will not float, but will be at a logic high when the switch is open, and logic low with the switch closed.

 

[MatrixPhreak]

Thank you all so much, the circuit is working like a dream now. If I have any more questions (not too likely, 'cause it seems to be all set now) I won't hesitate to ask.

You've all been so helpful, thanks