AT89S52 Mini Development Board – LED Interfacing

AT89S52 Mini Development Board has 3 SMD LEDs connected to port pins P1.3, P1.4 & P1.5 via jumpers J6, J4 & J3 respectively. If any jumper is left open, then the corresponding port pin can be used independently. The sample code given below toggles the LEDs in fixed intervals. Jumpers (J6/J4/J3) have to be shorted for using the desired LED.Schematic

Sample Code

/*****************************************************************
                          HEADER FILES
******************************************************************/ 
#include <REGX52.H>

#define LED1 P1_5
#define LED2 P1_4
#define LED3 P1_3

/*****************************************************************
                       FUNCTION DECLARATION
******************************************************************/
void Delay_ms(unsigned long int Delay);

/*****************************************************************
                          MAIN FUNCTION
******************************************************************/
void main()
{
 while(1)
 {
  LED1=0;LED2=0;LED3=0;   /* Make port pins low to turn on LEDs  */
  Delay_ms(500);          /* Delay to keep LEDs ON for sometime  */
  LED1=1;LED2=1;LED3=1;   /* Make port pins high to turn off LEDs*/
  Delay_ms(500);          /* Delay to keep LEDs OFF for sometime */ 
 }
}

/*****************************************************************
* Function    : Delay_ms                                         *
*                                                                *
* Description : Function for delay                               *
*                                                                *
* Parameter   : ms - delay in milliseconds                       *
******************************************************************/
void Delay_ms(unsigned long int Delay)
{
 Delay = Delay*15;
 while(--Delay!=0);
}

/***********************  END OF PROGRAM  ************************/

/*****************************************************************

HEADER FILES

******************************************************************/

#include <REGX52.H>

#define LED1 P1_5

#define LED2 P1_4

#define LED3 P1_3

/*****************************************************************

FUNCTION DECLARATION

******************************************************************/

void Delay_ms(unsigned long int Delay);

/*****************************************************************

MAIN FUNCTION

******************************************************************/

void main()

{

while(1)

{

LED1=0;LED2=0;LED3=0; /* Make port pins low to turn on LEDs */

Delay_ms(500); /* Delay to keep LEDs ON for sometime */

LED1=1;LED2=1;LED3=1; /* Make port pins high to turn off LEDs*/

Delay_ms(500); /* Delay to keep LEDs OFF for sometime */

}

/*****************************************************************

* Function : Delay_ms *

* *

* Description : Function for delay *

* *

* Parameter : ms - delay in milliseconds *

******************************************************************/

void Delay_ms(unsigned long int Delay)

{

Delay = Delay*15;

while(--Delay!=0);

}

/*********************** END OF PROGRAM ************************/

Topics related to AT89S52 Mini Development Board

Resources

Softwares
- ISP_AT89S
- Keil uVison 3
Datasheets
- AT 89S52
- AT 89S51
- LM 7805
- MAX 232
- 24C04
- CP 2102

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