In what form signal is given to AT89c51 mc’s input

[nitish kumar singh]

I had feed following program into AT89C51 mc . And for testing i am just connecting +ve terminal into P1^0 but nothing was happening to stepper  motor.

#include<reg51.h>
void MSDelay (unsigned int value);
sbit sense1=P1^0;
sbit sense2=P1^1;
void main ()
{
int i;
P1=0xf0;
while (1)
{
if (sense1==1 && sense2!=1)
{
for (i=0;i<=2;i++)
{
P2=0x66;
MSDelay (350);
P2=0xCC;
MSDelay (350);
P2=0x99;
MSDelay (350);
P2=0x33;
MSDelay (350);
}
}
sense1=0;
if (sense2==1 && sense1!=1)
{
for (i=0; i<=2;i++)
{
P2=0x66;
MSDelay (350);
P2=0x33;
MSDelay (350);
P2=0x99;
MSDelay (350);
P2=0xCC;
MSDelay (350);
}
}
sense2=0;
}
}
void MSDelay (unsigned int value)
{
unsigned int x,y;
for(x=0; x<1275;x++)
for(y=0;y<value;y++);
}

[Ashutosh Bhatt]

it should not be 

if (sense2==1 && sense1!=1)

but

if ((sense2=='1') && (sense1!='1'))

also these two pins must be configured as input by

P1 = 0x03;

[nitish kumar singh]

in both If condition, it is required to correct it or only in one case.

if ((sense2=='1') && (sense1!='1'))

if ((sense1=='1') && (sense2!='1'))

 

After making correction the led on ULN 2003 blink randomly but stepper motor yet not rotating.

[nitish kumar singh]

The above program is correct to rotate in clock wise and anticlockwise.I wantt to rotate only two step in each direction according to condtion not to rotate continously.

[nitish kumar singh]

please reply sir

 

[Ashutosh Bhatt]

which type of motor u have

unipolar or bipolar?

for unipolar u can use ULN2003A chip

but for bipolar u have to use L293D chip

the pulse sequence you are giving is for bipolar motor 

for unipolar motor it will be 0x01,0x02,0x04,0x08…..

[nitish kumar singh]

sir

i had purchased a stepper motor in which uln2003A was provided along with it.so it may be unipolar motor.

 

[nitish kumar singh]

following program is correct for rotating the stepper motor half revolution in clock wise and anti-clock wise.?

My aim is to use this stepper motor to close and open the Railway crossing gate..

#include<reg51.h>
void MSDelay (unsigned int value);
sbit sense1=P1^0;
sbit sense2=P1^1;
void main ()
{
int i;
P1=0x03;
{
if ((sense1=='1')&& (sense2!='1'))
{
for (i=0;i<=2;i++)
{
P2=0x01;
MSDelay (10);
P2=0x02;
MSDelay (10);
P2=0x04;
MSDelay (10);
P2=0x08;
MSDelay (10);
}
}
sense1=0;
if ((sense2=='1') && (sense1!='1'))
{
for (i=0; i<=2;i++)
{
P2=0x01;
MSDelay (10);
P2=0x08;
MSDelay (10);
P2=0x04;
MSDelay (10);
P2=0x02;
MSDelay (10);
}
}
sense2=0;
}
}
void MSDelay (unsigned int value)
{
unsigned int x,y;
for(x=0; x<1275;x++)
for(y=0;y<value;y++);
}

[nitish kumar singh]

reply sir?

If you have such program that is used to control the Gate then please sent it to my mail id [email protected]

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