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SERVO MOTOR

 
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misato14



Joined: 29 Mar 2010
Posts: 3

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SERVO MOTOR
PostPosted: Mon Mar 29, 2010 7:40 am     Reply with quote
Hello I'm using a servo motor futaba S3003. I'm using this code:
Code:

#include "18f4550.h"
#fuses HS,NOWDT
#use delay(clock = 4000000)
#define servo PIN_B1

void main(){

   while(true)
   {
   OUTPUT_HIGH(servo);
   delay_us(1500);
   OUTPUT_LOW(servo);
   delay_us(18500);
      
   }
}

Whatever values I put on the delay, the servo rotates to same side, I cannot rotate to the other side, or center. Can you tell me why, or what I'm doing wong?
dyeatman



Joined: 06 Sep 2003
Posts: 1924
Location: Norman, OK

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PostPosted: Mon Mar 29, 2010 8:10 am     Reply with quote
You need to learn how to use the forum search:

Searching on the word servo found this:

http://www.ccsinfo.com/forum/viewtopic.php?t=38862
_________________
Google and Forum Search are some of your best tools!!!!
mbge5amw



Joined: 13 Dec 2004
Posts: 15
Location: Yorkshire, UK

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PostPosted: Mon Mar 29, 2010 8:11 am     Reply with quote
I don't know if you have any external pullup resistors on your device to make the pins go high.
You may need the line
Code:
port_b_pullups(TRUE);

before your while loop.

I would also suggest you get a meter to double check that the output pin is/is not toggling as you expect, so you can identify if it is a SW or HW issue

Andy
Rohit de Sa



Joined: 09 Nov 2007
Posts: 282
Location: India

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PostPosted: Mon Mar 29, 2010 8:31 am     Reply with quote
You don't really need pull-ups. Do you get a pulse on B1? Can you check this with an oscilloscope? If not, in your clock/fuse definition:
Code:
#fuses HS,NOWDT
#use delay(clock = 4000000)
Use XT instead of HS.

Rohit
misato14



Joined: 29 Mar 2010
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PostPosted: Mon Mar 29, 2010 8:48 am     Reply with quote
We already used an oscilloscope, and it is 50 Hz wave and the duty cycle is correct. I already use fuse XT and HS... the result is the same....
dezso



Joined: 04 Mar 2010
Posts: 102

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PostPosted: Mon Mar 29, 2010 9:14 am     Reply with quote
http://mcu-programming.blogspot.com/2006/09/servo-motor-control.html
misato14



Joined: 29 Mar 2010
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PostPosted: Mon Mar 29, 2010 9:48 am     Reply with quote
I already seen that link, but problem remains, is that the servo rotate to one side whatever value I put in the duty cycle. I cannot find the problem and I already buy a new servo motor. I'm using pic 18f4550.
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