Change object names in functions

Projects Programming
1

Hi,

How do you change object names within functions?

E.G.:

#include <Servo.h>

....

...

Servo s1;
Servo s2;

void setup()
{
s1.attach(PWM1);
s2.attach(PWM2);
}

void loop() {

moveServo1 (0, upperLimit1, lowerLimit1, timeScale1, HIGH, 1);

}

void moveServo1 (byte curve, int upperLimit, int lowerLimit, int timeScale, boolean dir, byte servo) {
int i;
if (dir == HIGH) {
for (i=lowerLimit;i<=upperLimit;i++) {
s1.writeMicroseconds(i);
if (curve == 0) {
delay(cos_curve[(i-lowerLimit)/((upperLimit-lowerLimit)/50)]/timeScale);
}
if (curve == 1) {
delay(timeScale);
}
}
}
else {
for (i=upperLimit;i>=lowerLimit;i--) {
s1.writeMicroseconds(i);
if (curve == 0) {
delay(cos_curve[(i-lowerLimit)/((upperLimit-lowerLimit)/50)]/timeScale);
}
if (curve == 1) {
delay(timeScale);
}
}
}
}

How could I change the s1 object within the moveServo1 function to e.g. s2?

I need this becaus I don not want to write X functions that look the same.

Please help!

2

You don't. You're already passing the servo number to the function. Use that to decide which servo object to move.

3

Pass the servo object by reference instead of "hard-coding" which servo to use. You can also separate the delay calculation out to another function (see example below).

unsigned long compute_delay(byte curve, int i, int timeScale)
{
  if (curve == 0)
    return cos_curve[(i-lowerLimit)/((upperLimit-lowerLimit)/50)]/timeScale;
  if (curve == 1)
    return timeScale;
}

void moveServo1 (byte curve, int upperLimit, int lowerLimit, int timeScale, boolean dir, byte servo) {
  int begin,end,c;
  if (dir == HIGH) {  
    begin = lowerLimit;
    end = upperLimit;
    c = 1;
  } else {
    begin = upperLimit;
    end = lowerLimit;
    c = -1;
  }
  for (i=begin; i!=end; i+=c) {
    s1.writeMicroseconds(i);
    delay( compute_delay(curve, i, timeScale) );
  }
}
4

I'll use the MegaServo lib and the suggestion for an extra time function.
=I don't know how to pass the servo object with a reference, amber...

Thanks.