refresh not a member of Servo?

Projects Programming
1

I built a pan & tilt for a webcam with a pair of servos. Trying to learn how to work with servos and pulled this code from a tutorial on the net:

// Maurice Ribble
// 4-6-2008
// http://www.glacialwanderer.com/hobbyrobotics

// This code depends on the Servo Software Library.  You can get
// this lib from http://www.arduino.cc/playground/ComponentLib/Servo

// To use this app just send the board a number followed by an 's'
// to set the angle of the servo (0-180 are valid)

#include <Servo.h>
// This is the pin you need to attach the servo to
#define SERVO_1_PIN 2

Servo g_servo1;

void setup()
{
  pinMode(SERVO_1_PIN, OUTPUT);
  g_servo1.attach(SERVO_1_PIN);
  Serial.begin(9600);
  Serial.println("Enter number and press 's' to send it to servo.");
}

void loop()
{
  static int val = 0;

  if (Serial.available())
  {
    char ch = Serial.read();

    switch(ch)
    {
      case '0'...'9':
        val = val * 10 + ch - '0';
        break;
      case 's':
        g_servo1.write(val);
        Serial.print("Servo1 is set to: ");
        Serial.print(val, DEC);
        Serial.println(" degrees");
        val = 0;
        break;
    }
  }

  Servo::refresh();  // Should try to call this every 20 ms to insure servo stays set
}

tried a different set of code from a different tutorial, both giving me error "refresh not a member of Servo"

any ideas?

regards, Richard

2

The compiler is quite right - refresh is not a member of Servo. Perhaps that example was written against a different Servo library, or a different version of it? As far as I can see, your sketch ought to work OK if you just get rid of the refresh() calls.

3

Great, thanks.

regards, Richard

4

The compiler is quite right - refresh is not a member of Servo. Perhaps that example was written against a different Servo library, or a different version of it?

An older version. The refresh() method used to need to be called every 20 milliseconds, or so. Now, that functionality is performed automatically, based on a timer.