51proteus simulation: 16x16LED displays a Chinese character

There are billboards everywhere that display Chinese characters on LED displays. The principle is actually very simple. We can use a 51 single-chip microcomputer to control the display of Chinese characters.

As a principle experiment, I only use four 8x8 LEDs to display a Chinese character "欢". If you understand this experiment, it is not difficult to do the scrolling and displaying in turns.

Test environment: proteus,keil

Experiment with virtual components:

4 MATRIX-8x8-RED

1 4-16 decoder: 74HC154

Microcontroller:ATC89C52

Resistor: RESPACK-8, because P0 port is used, so pull-up resistor is required.

Originally, four 74ALS373s were needed to drag the LEDs, but in order to simplify the experiment, four 74ALS373s were omitted in the virtual experiment. Please pay attention to this when doing a physical demonstration.

In addition, use the software "Font Wizard" (search on Baidu) to obtain the font of Chinese characters. A Chinese character has 32 bytes of data, P2 is the high 8 bits, and P0 is the low 8 bits.

Pay attention to the connection of the four LEDs:

The two LEDs above are the upper 8 rows. I used l1-l8.

The lines of the two blocks below are l9--l16.

The columns from right to left are h1--h16.

The principle of rotating display is:

The first time, i=0, row 1, send column data 0x00 (P2), 0x80 (P0), then the 7th bit of P0 in the first row is on;

The second time, i=1, the second row, send column data 0x00, 0x80, then the 7th bit of P0 in the second row is bright;

The third time, i=2, the third row, send column data 0xfc, 0x80, then the third row P2 high 7 bits light up, P0's highest bit lights up;

...and so on, 16 rows of LEDs are lit up one by one.

Adjust the delay time, and you will see all 16 rows of selected LEDs light up, and the Chinese characters will be displayed.

Simulation circuit diagram (click or download to see the enlarged image):

Complete C program:

#include

unsigned char code tab0[]={
0x00,0x80,0x00,0x80,0xFC,0x80,0x05,0xFE,0x85,0x04,0x4A,0x48,0x28,0x40,0x10,0x40,
0x18,0x40,0x18,0x60,0x24,0xA0,0x24,0x90,0x41,0x18,0x86,0x0E,0x38,0x04,0x00,0x00
};

  void delay()
  {
  unsigned char i,j;
  for(i=0;i<2;i++)
   for(j=0;j<255;j++);

  }

main()
{
 unsigned char i,j;
 while(1)
 {
   j=0;
   for(i=0;i<=15;i++)
   {
   P1=i;
   P2=tab0[j];
   P0=tab0[++j];
   delay();
   P2=0x00;
   P0=0x00;
   j++;
   }

 }

}