Servo code invert trouble

Projects Programming
1

Hello,

I am using the sweep code in from ardunio and I would like the servo to start from 180 Degrees and go to 90 Degrees. (It can't start at 0 Degrees because of the way my servo is mounted. Therefore it must start at 180 Degrees) I modified he sweep code (see code below) but when I run it, it doesn't work. It just goes to 180 Degrees and stays there.
How do I fix this?

Thanks.

This is the code:

/* Sweep
by BARRAGAN http://barraganstudio.com
This example code is in the public domain.

modified 8 Nov 2013
by Scott Fitzgerald

*/

#include <Servo.h>

Servo myservo; // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0; // variable to store the servo position

void setup() {
myservo.attach(10); // attaches the servo on pin 9 to the servo object
}

void loop() {
for (pos = 180; pos <= 90; pos += 1) { // goes from 0 degrees to 180 degrees
// in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
for (pos = 90; pos >= 180; pos -= 1) { // goes from 180 degrees to 0 degrees
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
}

2 
for (pos = 180; pos <= 90; pos += 1)

Think.

3

TheMemberFormerlyKnownAsAWOL:

for (pos = 180; pos <= 90; pos += 1)

Think.

Thought could be a useful concept.

What about

for (pos = 180; pos >= 90; pos -= 1)

...R

4

And the other one. If you start at 90 do you really think it will be greater than 180 even for the first loop?

Steve

5

Maybe to get the servo started off on the right foot, do something like the below in the code setup.

int pos = 90;    // variable to store the servo position

void setup() {
  myservo.attach(10);  // attaches the servo on pin 9 to the servo object
  myservo.write(pos);
}