undefined reference to `SoftwareServo::attach(int)'

Projects Programming
1

Hi all

I hope somebody can help me with this. I tried compiling this code

#include "SoftwareServo.h"

SoftwareServo myservo;  // create servo object to control a servo 

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin 

void setup() 
{ 
  myservo.attach(2);  // attaches the servo on pin 2 to the servo object 
} 

void loop() 
{ 
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023) 
  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180) 
  myservo.write(val);                  // sets the servo position according to the scaled value 
  delay(15);                           // waits for the servo to get there 

  SoftwareServo::refresh();

But i get the follwing errors:

sketch_feb14a.cpp.o: In function `setup':
/Arduino/sketch_feb14a.ino:10: undefined reference to `SoftwareServo::attach(int)'
sketch_feb14a.cpp.o: In function `loop':
/Arduino/sketch_feb14a.ino:17: undefined reference to `SoftwareServo::write(int)'
/Arduino/sketch_feb14a.ino:21: undefined reference to `SoftwareServo::refresh()'
sketch_feb14a.cpp.o: In function `__static_initialization_and_destruction_0':
/Arduino/sketch_feb14a.ino:20: undefined reference to `SoftwareServo::SoftwareServo()'
collect2: error: ld returned 1 exit status

In softwareservo.h I changed the wprogram.h to #include <Arduino.h>.

It should be noted that i did not have my arduino connected to the computer but only tried compiling it on the computer.
Any help would be appriciated.

2

Where did you put the SoftwareServo library? Is it in the same folder as the sketch or in the libraries folder?

3

It looks, since you are getting linker errors, not compiler errors, like you only have the header file (SoftwareServo.h). Do you, in fact, have the source file (SoftwareServo.cpp), too?

4

It works now.

I had the header file in the same dir as the project file. I changed the #include <SoftwareServo.h> to #include "SoftwareServo.h".
I copied the cpp file to the same directory and changed the same in this file and now it works. This i hadn't done before.

Thanks to both of you. I am not that good at cpp.