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4hv.org :: Forums :: Computer Science
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AT89S52 Servo Controller
Move Thread LAN_403
lhl_henrylui
Sun Jun 28 2009, 07:46AM Print
lhl_henrylui Registered Member #1498 Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72
 		I have wirtten this program to control a servo by AT89S52 but the servo didn't move when the chips was running(the LED blinked but the servo had no response.Please help me to check if there is any mistake in the program below.
P1_0 is connected to the signal pin of the servo and P2_7 is connected to a LED(active low).

#include<AT89X52.h>
#define count 100
#define TH_M1 (65536-count)/256
#define TH_L1 (65536-count)%256
int i;
Delay(unsigned int);

main()
{
P2_7=0;
IE=0x82;
TMOD=0x01;
while (1)
{
P1_0=0; //@0
Delay(10000);
P1_0=1;
Delay(10);
P1_0=0;
Delay(190);
P1_0=1;
Delay(10);
P1_0=0;
Delay(190);

P2_7=1;
Delay(5000);
P2_7=0;

P1_0=1; //@90
Delay(15);
P1_0=0;
Delay(185);
P1_0=1;
Delay(15);
P1_0=0;
Delay(185);

P2_7=1;
Delay(5000);
P2_7=0;

P1_0=1; //@180
Delay(20);
P1_0=0;
Delay(180);
P1_0=1;
Delay(20);
P1_0=0;
Delay(180);
P1_0=1;

P2_7=1;
Delay(5000);
P2_7=0;

P1_0=1; //@0
Delay(10);
P1_0=0;
Delay(190);
P1_0=1;
Delay(10);
P1_0=0;
Delay(190);

P2_7=1;
Delay(5000);
P2_7=0;
}
}

Delay(unsigned int j)
{
for(i=0;i<j;i++)
{
TH0=TH_M1;
TL0=TH_L1;
TR0=1;
while(TF0==0);
}
}
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lhl_henrylui
Tue Jun 30 2009, 02:09AM
lhl_henrylui Registered Member #1498 Joined: Thu May 22 2008, 07:08AM
Location: Hong Kong
Posts: 72
 		please help me!
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Carbon_Rod
Tue Jun 30 2009, 08:00AM
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
 		vague question... and a double post...

If the servo is a hobby unit sold with RC vehicles it still may be pulse controlled, or a high end digital unit.


Typically you may test cheap units with a simple signal generator:
50Hz refresh rate (note the period)
20mS 5v high pulse (varies with position and servo type)


There is far too much code on google for me to bother debugging your code.
try something like:
for(int i=20; i< k; i++){ /* high pulse time */
for(int j=0;j<100;j++){ /* repeat the signal j times */
P1_0=1;
Delay(i);
P1_0=0;
Delay(k-i); /* k is a constant that approximates the entire period */
}
}


Cheers,
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Steve Conner
Tue Jun 30 2009, 10:30PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
lhl_henrylui wrote ...

please help me!
No :P The problem could well be some hardware related thing anyway.
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