microcontroller based matrix led project

   microcontroller based matrix led project

—1. First Application

—Introduction

—The best thing to do with the matrix; is to draw any image and to animate the image.

—For me, I decide to diagram a smiling simple face and then change the figure and make it sad, so I'm alternating between the smiling face and the sad face; every second the LED matrix 8 * 8 changes the state of the face.

—I realize this project using professional ISIS simulation software and other programming software MICRO C.

—components used

—• Matrix LED 8 * 8.

—• Microcontroller pic 16F877.

 

—MATRIX

There are many type of matrix LED

—8 * 8, 5 * 7 16 * 16, 32 * 32 ...

 

—All the matrix have:

—  lines which connect each anode of a line of LED.

—columns that connect each LED kathode of a column

 

—in my application I connect all the columns in port B and all the lines PORTC

Microcontroller 16F877

—PIC micro structure

—The microcontroller is a digital component that can accept data in analog and digital form. To use it you must determine how the pins (pins) of the microcontroller will be used: inputs or outputs.

—For example on the 16F877A component below the pin 2 is labeled RA0 / AN0.this means that pin 2 can be used as an input or output (RA0 = "bit" of 0 or 1) or as an analog input (AN0) with voltage ranges from 0V to + VDD

—We must properly configure the microcontroller before using the component

—The microcontroller can be programmed in C or assembler.

—The 16F877A has 5 ports assigned letters A, B, C, D, E. Each pin of a port is identified by a number for the port A RA0 to RA5 to port B of RB0 to RB7 etc. we  notice for this microcontroller , port A has 6 pins ,port B  8 pins as the ports C and D and the port E owns only 3.

—This means that we can connect for example 6 inputs (sensors) or output (LEDs or motors) on port A, 8 on port B.

—Some pin has multiple functions such as denoted 25 pin RC6 / TX / CK.

—RC6: input or output bit 6 of port B.

—TX: Transmission of serial programming interface.

—CX: clock (Clock) of the serial interface.

—Ports are hard links of your program with the external environment (sensor, display, engine etc.).

—The ports are connected to the internal circuitry of the PIC via an 8 bit bus system.

— Internal structure of the pic

— Circuit project on ISIS

      smiling face

Sad  face

Programmation

 

Void main () {

Char i;

 TRISB = 0X00;

 TRISC = 0X00;

 PORTB = 0X00;

 PORTC = 0X00;

 While (1){

  For (i=0;i<100;i++)

  {

   Portb = 0XC3;

   portc = 0X81;

   delay_ms(1);

portb = 0XBD;

    portc = 0X42;

    delay_ms(1);

  portb = 0X7E;

    portc = 0X24;

    delay_ms(1);

    portb = 0X7E;

    portc = 0X18;

    delay_ms(1);

     portb = 0XFB;

    portc = 0X18;

    delay_ms(1);

 

     portb = 0XD7;

    portc = 0X24;

    delay_ms(1);

   

    portb = 0X7E;

    portc = 0X18;

    delay_ms(1);

     portb = 0XD7;

 portc = 0X24;

    delay_ms(1);

 

  }

  delay_ms(20);

   for(i=0;i<100;i++)

  {

   portb = 0XC3;

   portc = 0X81;

   delay_ms(1);

portb = 0XBD;

    portc = 0X42;

    delay_ms(1);

   

     portb = 0X7E;

    portc = 0X24;

    delay_ms(1);

 

    

      portb = 0XF7;

    portc = 0X18;

    delay_ms(1);

  portb = 0X7E;

    portc = 0X18;

    delay_ms(1);

 portb = 0XDB;

    portc = 0X24;

    delay_ms(1);

   

     portb = 0XF7;

    portc = 0X18;

    delay_ms(1);

    }

   }

}