hi all ..
i made a code for a servo motor which keep rotating from left to right
but its not working…
on search i came to know dt it requires a pulse of 55hz with ON time of around in between 2.4 ms to 1.0 ms for full rotation left and right.
to generate this i made a timer which counts for 0.1 ms and if i need to genrate a pulse of 1.4 ms, make the timer to overflow 14 times…and so on ..
but it is not working.
here is the code attched CODE:
#includeltreg51.hgt
sbit SIGNAL =P0^1;
void delay(void);

void main(void)
{
unsigned char i,j;
while(1)
{
for (j=0;jlt11;j++) //this will flow the 11 pulses with ontime of 1.5 ms and off time 16.7ms
{ for (i=0;ilt15;i++) //this will make the on state for 1.5ms
{
SIGNAL=0xFF;
delay();
}

for (i=0;ilt167;i++) //this will make the off state for 16.7 ms.so that total on+off time is equal to around 18ms which is 55hz pulse.
{
SIGNAL=0X00;
delay();
}
}

for (j=0;jlt11;j++) //this will flow the 11 pulses with ontime of2.4 ms and off time 15.7ms
{
for (i=0;ilt24;i++)
{
SIGNAL=0xFF; //this will make the on state for 2.4 ms
delay();
}

for (i=0;ilt157;i++) //this will make the on state for 15.7 ms
{
SIGNAL=0×00;
delay();
}
}
}
}

void delay(void) //THIS TIMER MAKES DELAY OF 0.1ms
{
TMOD=0×20;
TH1=-92;
TR1=1;
while(TF1==0);
TR1=0;
TF1=0;
}