hi everyone,

im working on a proj SERVO MOTOR BASED ROBOTIC ARM using 89C51 micro controller..im using 5 servo motors in the proj. im new to usage of servos. i know that diff servos uses diff pulse widths for its left,right,neutral positions..the servo im using is:TOWER PRO MG995(Digi High Speed)..im facing few problems in the motor rotations..

im using +5v(dc) for the motor..the signal pin of the servo is connected to the microcontroller port pin via 10k resistor.initially ive started working on one servo and im also giving the code ive developed for that. can the same code be used by all the other servos?also please tell me the precautions to take for completing the proj successfully..please respond at the earliest..its very very urgent..

THANK U IN ADVANCE……..

code is below:

/*FOR SERVO-2 FROM TOP..*/

#includeltreg51.hgt
#includeltstdio.hgt

void serial_init();
void MSDelay(unsigned char);
void NDelay();
void MSADelay();
void MSCDelay();

sbit svm2=P2^3;
unsigned char dat;
unsigned char i;

void main()
{
svm2=0; /*configuring the signal pin as o/p port pin*/
while(1)
{
serial_init();

printf(“\nTHIS IS THE TEST TO IMPLEMENT CONTROL OF SERVO MOTOR…\n\n”);
printf(“\nPress ’1′ to rotate in Anti Clock direction\n\n”);
printf(“\nPress ’2′ to rotate in Clock direction\n\n”);
printf(“\nPress ’3′ to stay in Neutral position\n\n\n”);

while(RI==0);
dat=SBUF;
RI=0;

switch(dat)
{
case 0X31:

for(i=0;ilt18;i++)
{
svm2=1;
MSADelay();
svm2=0; /*1.25 msec pulses–0 deg-anti clock*/
MSDelay(15);
}
break;

case 0X32:

for(i=0;ilt18;i++)
{

svm2=1;
MSCDelay(); /*1.75 msec pulses–180 deg-clock*/
svm2=0;
MSDelay(15);
}
break;

case 0X33:

for(i=0;ilt18;i++)
{

svm2=1;
NDelay(); /*1.5 msec pulses–90 deg-neutral*/
svm2=0;
MSDelay(15);
}
break;

default:
;;;
break;
}//switch

}//while
}//main

void MSDelay(unsigned char cnt)
{
unsigned char j;
TMOD=0×10; /*1 ms delay*/
for(j=0;jltcnt;j++)
{
TH1=0xfc;
TL1=0×66;
TR1=1;
while(TF1==0);
TR1=0;
TF1=0;
}
}

void NDelay()
{
TMOD=0×10;
TH1=0xfa;
TL1=0×99;
TR1=1; /*1.5 ms delay*/
while(TF1==0);
TR1=0;
TF1=0;
}

void MSADelay()
{
TMOD=0×10;
TH1=0xfb;
TL1=0x7f;
TR1=1; /*1.25 ms delay*/
while(TF1==0);
TR1=0;
TF1=0;
}
void MSCDelay()
{
TMOD=0×10;
TH1=0xf9;
TL1=0xb3;
TR1=1; /*1.75 ms delay*/
while(TF1==0);
TR1=0;
TF1=0;
}
void serial_init()
{
TMOD=0×20;
SCON=0×52; /*serial initialization*/
TH1=-3;
TR1=1;
}