I tried to control the intensity of one LED by the following logic.

microcontroller---to---Digital to Analogue converter---to---LED

   8051                DAC 0808 LCN
  AT89C51

I connected the circuit diagram as shown in the following figure.

http://8052.com/users/ammarlamhay/ledglow.jpg

logic:
The Analogue to Digital converter is connected to port 3 of microcontroller 8051 ans shown in the figure http://8052.com/users/ammarlamhay/ledglow.jpg.
Then LED is connected to the output pin of D/A converter.
Now via following code I triesd to send digital signals to D/A converter by changing the number of pins in the following way.

digital value    binary value    Corresponding Hexadecimal value
                (actually P3)          (value assigned to
                                        8051 via C Language)
0                 00000000                      00
17                00010001                      11
64                01000000                      40
128               10000000                      80
192               110000000                     C0
238               11101110                      EE
255               11111111                      FF
238               11101110                      EE
192               110000000                     C0
128               10000000                      80
64                01000000                      40
17                00010001                      11

YOu can see that it is a crude sine wave.. slightly distorted..
The 00000000 assigned to P3 will keep LED off. 00010001 will on it. 01000000 will on it with more intensity as P3^2 has more priority that P3^3 + P3^8. and so on. Thus intensity is controlled.
this is my C code compiled on KEIL with no errors and warnings and HEX file created successfullly on Proteus.

Save This Code
#include <reg52.h>
#define SIZE 12

void wait(void)
{
   int x;
   for( x = 0; x <= 32700; x++ );
}
void main(void)
{
   unsigned long crude[SIZE] = { 0x00, 0x11, 0x40, 0x80,
    0xC0, 0xEE, 0xFF, 0xEE, 0xC0, 0x80, 0x40, 0x11 };
   int i;
   for( ; ; )
   {
      for( i = 0; i < SIZE; i++ )
	  {
	     P1 = crude[i];
		 wait();
	  }
	}
}



MY PROBLEM:

But my problem is that as there is only ON and OFF in electronics so I can not see the intensity on software proteus. I also switched multimeter there but no change in cutrrent is shown may be due to sudden change in intensity in one second to other intensity level(total levels made in this program are 12 so almost 11 seconds to execute the whole on---to---highest intensity---to---off.).

MY QUESTION
Is it correct to burn on 8051 and see the response?