servo question

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1

I am trying to rebuild a hexa pod I have from a different comtroler (Stamp) and have a basic servo code, which works fine for one servo.

Now here comes the problem if I add a second servo and duplicare the basic servo code (with a second servo object).

whin I run the attached code the 1st servo only steps 1 incriment (it does not go through the entire range of motion) and then the 2nd servo goes through an entire range of movement waits 2 sec and then runs again. servo 1 only steps once rhroughout the run of the program.  As far as I can figure it is falling through to the second "for" condition.

How do I fix this, I want the 1st servo to go through its full range then 2nd servo goes through the full range of movement and then back to 1st servo etc...

 

// Sweep
// by BARRAGAN <http://barraganstudio.com>
// This example code is in the public domain.
// Pin 9 = data servo 1

// Pin 10 = data servo 2
#include <Servo.h>
 
Servo myservo;  // create servo object to control a servo0
Servo myserv1;  // create servo object to control a servo1
int pos = 0;    // variable to store the servo position

init pos1 = 0;
void setup()
{
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  myservo.attach(10);
}
void loop()
{
for(pos = 0; pos < 145; 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
  }
   delay(50);
for(pos = 145; pos>=1; 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
  }
     // set the LED on
  delay(50);              // wait
    for(pos = 0; pos < 145; pos += 1)  // goes from 0 degrees to 180 degrees
  {                                  // in steps of 1 degree
    myserv1.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);    // waits 15ms for the servo to reach the position
  }
   delay(50);
for(pos = 145; pos>=1; pos-=1)     // goes from 180 degrees to 0 degrees
  {                               
    myserv1.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
  delay(50);              // wait
}

 

UncleMike

2

Hello. Some problems I

Hello. Some problems I see;

1) You never attach myserv1 in your setup. You attach myservo to both pins. This explains the motion. The first servo twitches when something is initialized to pin 9 but stops right away as myservo is reinitialized to pin 10. myservo then runs your code as normal. I think this is your primary problem. Change to;

void setup()
{
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  myserv1.attach(10); // attaches servo 2 on pin 10.
}

2) For future coding practices name your servos myserv0 and myserv1 or myservo0 myservo1. Keep your naming convention consistent, the last character switches between a letter and a number - this could give you headaches in large code blocks.

Cheers,
Gonzik



3

Good call, thats why a

Good call, thats why a second pair of eyes help. Also I ment to tag them 0 and 1 but used o instead of 0

thanks

UncleMike

4

**Hi **

Hi 

The problem is in  void setup()

it should be

void setup()
{
  myservo.attach(9); 
  myserv1.attach(10);
}

Hope this helps.

Also theres no need for “init pos1 = 0;” in the code as you have only used the variable “pos” and not “pos1” anywhere.

 

5

Sorry read your comment

Sorry read your comment after replying

6

I’m suprised it compiles

I’m suprised it compiles with init, should be int

7

Yes that should be int and

Yes that should be int and not init.My bad