HELP: Code for controlling a servomotor

[AdrianB]

Hi there!

I'm working on a home-made pingpong trainer. The last thing I need is to control my servomotor in that way that it can rotate 90° back and forth several times. Being completely new to electronics, I had no idea where to start. I've gathered information and the needed stuff.

My servomotor is a TowerPro MG995, my microcontroller is a PicKit2 , and I'm wanting to write a code in MPLab v.8.90 to control it. I've been looking around the internet for information, and I've written a first shot (see below).

First of all, would this code work, or is there something wrong in it (apologies for eventual stupid errors) ?
Second: I've written 20ms in the delay() function because I read a servo needs an impuls every 20ms, is this right ? Could someone eventually explain why ?

If there is a better or more efficient way to go, please tell me your knowledge !

Any help will be much appreciated !

Regards,

Adrian




The "servo.h" library is a free library I found on Arduino, including the functions I use here. "servo301" is the name I wanted to give it.
(https://code.google.com/p/arduino/source/browse/trunk/libraries/Servo/Servo.h?r=1088 )

// Besturingscode servomotor.

#include "servo.h"
 
Servo servo301;
 
int pos = 0;
 
void setup()
{ 
  servo301.attach(7);
} 
 
 
void loop() 
{ 
  for(pos = 0; pos < 90; pos += 1)
  {                                 
    servo301.write(pos);      
    delay(20);                 
  } 
  for(pos = 90; pos>=1; pos-=1)   
  {                                
    servo301.write(pos);         
    delay(20);
  } 
}