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Servo Position Control Problem

 
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407grup



Joined: 24 Jan 2010
Posts: 1

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Servo Position Control Problem
PostPosted: Sun Jan 24, 2010 7:01 am     Reply with quote
First of all, I don't know a lot about servos or CCS C programming.

I use 16F877A PIC and Spring RC Servo motor, I tried the available codes on this forum but it did not work.

I want to make the positioning of this servo on the way I like, how can I do it? Can you supply me any codes.

Code:
#include <16f877a.h>
#fuses HS, NOWDT, NOPROTECT // Set Fuses
#use delay(clock = 1000000) // Synchronize with the Oscillator
#define servo PIN_C0

void forward();
void backwards();

void main()
{

while(1)
  {
   backwards();
   delay_ms(5000);
   forward();
   delay_ms(5000);
  }
}

void forward()
{ 
output_high(servo);
delay_ms(2);
output_low(servo);
delay_ms(18);
}

void backwards()
{
output_high(servo);
delay_ms(.5);
output_low(servo);
delay_ms(19.5);
delay_ms(16);
}
septillion



Joined: 21 Jan 2010
Posts: 13

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PostPosted: Sun Jan 24, 2010 8:54 am     Reply with quote
delay_ms expects a int16 value, not a float. 0.5 won't work.
bungee-



Joined: 27 Jun 2007
Posts: 206

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PostPosted: Sun Jan 24, 2010 11:24 am     Reply with quote
RC servos are controlled with pulse train. You send a pulse to a servo every 20ms, width of pulse determines where the servo will go and it is typically from 1ms to 2ms in length.

Now said that, you should use search on forum. There is a lot of code posted here.

Go to the forum's search page:
http://www.ccsinfo.com/forum/search.php
Put this in the search box:
RC SERVO
Set it to "Search for all Terms".
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