HOw to interface servo motor with 8051?

[Embedded_pic]

Hi all,

i'm trying to interface a servo motor with a 8051 mcu.

so i tried this code, when i compile i have an errot at line:

void extr0(void) interrupt 0

the error message is:   INT.C(33): error C141: syntax error near 'void'

 

Here is the code:

#include<regx51.h>

sbit  servomotor_pin=P1^0;
void delay(unsigned int);
void servo_delay(unsigned int);

//Timer
void timer(int msec)     // Function for timer
{
int i;
for(i=0;i<msec;i++)

{
TMOD=0x20;         // Mode2
TH1=0xFF;
TL1=0xD1;
//TH1= -23;        // 50usec timer
TR1=1;
while(TF1==0);
TF1=0;
TR1=0;
}
}

void main()
  {
    int i;
    IE=0x85;  
    servomotor_pin=0x00;   
                  // Activating both the interrupts EX0 and EX1

//Subroutine EX0 with interrupt number '0'       
void extr0(void) interrupt 0     
  {
   P0=0xff;
//Your command goes here
 while(1)
  {
//anticlockwise direction
    for(i=0;i<500;i++)
      {
         servomotor_pin=1;
         timer(20);
         servomotor_pin=0;
         timer(360);
         }
          }
           }   

void extr1(void) interrupt 2    //Subroutine EX1 with Interrupt Number '1'
  {
   P0=0x00;
// turn to 0°

  }
  }

[Prabakaran P M]

HRefer this link http://www.engineersgarage.com/microcontroller/8051projects/stepper-motor-interfacing-with-8051-microcontroller-circuit

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Hi,

thank you but the link shows me for stepper motor and not servo motor.

 

[Prabakaran P M]

Hi, Here is the link for servo motor interface

http://www.engineersgarage.com/microcontroller/8051projects/servo-motor-project-circuit

[Rahul Tungar]

you can not write ISR inside main.. isr code should be outside of your main function.

flow should be lyk this

void main()

{

//basic initialisation as per your hardware

//configure and enable interrupts

while(1);

}

void extr1(void) interrupt 0

{

//your ISR CODE

}

void extr0(void) interrupt 2

{

 

//your another ISR CODE

}

 

[Embedded_pic]

No one of the answer is correct, i'm still stuck with my code.

Any help please, thank you

[Embedded_pic]

All answers were too complicated for me, i figured out using NE555 with 8051. without any timer and delay.

thank you

[Vara Ashishkumar]

Hey Embedded_pic,

Closed void main loop by curly bracket ( ' } ' ) before line void extr0(void) interrupt 0 and remove the last curly breaket at end of the code.Then compile it.

[Author]

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