Thread: Proportional servo motor control Help Needed

I am in the process of building a autonomous yacht with proportional steering. The input for Proportion Control is taken from 5V Pot ( no stop ). This input is then sent to the output of a 180 degree servo motor. I have succeeded in controlling this system with a Arduino UNO. I want to control the same hardware on a Galileo in C. I have a test function wrote and will attach. In this function you can see how the full duty cycle is calculated but, what I want to do is input one figure to the function that will control the ON cycle and the OFF cycle. Any help would be appreciated.
Cheers,
John

Code:

***********************************************
void servoPWM(int);
int ON,OFF,x;
int servo = 9;


void setup(){
  Serial.begin(9600);
  pinMode(9,OUTPUT);
}


void loop() 
{
 int Dir;

 //if(Dir==
   for(Dir=-90;Dir<90;Dir++)
   {   
     servoPWM(Dir);
     delay(10);
   }
   for(Dir=90;Dir>-90;Dir--)
   {   
     servoPWM(Dir);
     delay(10);
   }


}


void servoPWM(int Dir)
{
     ON = map(Dir,-90,90,550,2250); 
     OFF = 20000 -ON;


     digitalWrite(servo,HIGH);
      delayMicroseconds(ON);
      digitalWrite(servo,LOW);
      delayMicroseconds(OFF);
  
   Serial.print("Direction  ");
      Serial.println(Dir);
      Serial.print("ServoON  ");
      Serial.println(ON);
      Serial.print("ServoOFF  ");
      Serial.println(OFF);   
} 

***************************************************************************
  

Hi John,
It appears your duty cycle is dependent on the Map function which is not included.
The full duty cycle is 20000 at this time.
The OFF will just be the part that is not ON out of 20000.
I'm not real clear on what you need.