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Servo Rotation Problem With CCS C

 
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iraquois



Joined: 09 May 2018
Posts: 1

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Servo Rotation Problem With CCS C
PostPosted: Wed May 09, 2018 2:01 am     Reply with quote

Hi. I am trying to control my servo with this code. But my servo just rotates 90 degrees and then stops. According to my code it should move to 2 different degrees. Please help. I couldn't figure out what to do. Thanks.

Code:

void servo(unsigned long int b)
{                   
 output_high(pin_d0);
 delay_us(b);
 output_low(pin_d0);
 delay_us(20000-b); 
}

void main()
{
lcd_init();

while(1)
  {
   delay_ms(1000);
   servo(400);
   delay_ms(1000);
   servo(600);
   delay_ms(1000);
  }   
}
Ttelmah



Joined: 11 Mar 2010
Posts: 13261

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PostPosted: Wed May 09, 2018 3:33 am     Reply with quote

Servos require a pulse of 0.5mSec for one end of their travel to 2.5mSec for the other end. The standard pulse repetition 'interval' is every 20mSec. 2mSec full scale range.

Think about it. With your code, the pulse is changing from 400uSec to 600uSec. The first shorter than the shortest servo pulse is meant to be, and the second only 100uSec into the range. About 9 degrees (assuming a 180 degree servo travel).

Code:

while(1)
  {
   delay_ms(1000);
   servo(500); //Minimum allowable pulse
   delay_ms(1000);
   servo(1000); //1/4 scale movement
   delay_ms(1000);
  }   
}


This also assumes you have got your chip's oscillator setup correctly with #use delay.
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