Servo Coding Problem

Using Arduino Programming Questions
#1

Hey, I want to operate two servos facing each other and their directions are opposite as both goes 0 to 180 degrees. I want to synchronize both like when one goes 0 to 180 degree while the other goes 180 to 0 degree.

here is my code, but It didnt work. could you please help me.

#include <Servo.h> 
 
Servo servo9;  
Servo servo10;    
 
int pos9 = 0;    // variable to store the servo position 
int pos10 = 180;
 
void setup() 
{ 
  servo9.attach(9);  // attaches the servo on pin 9 to the servo object 
  servo10.attach(10); // attaches the servo on pin 10 to the servo object
} 
 
 
void loop() 
{ 
  for(pos9 = 0; pos9 < 180; pos9 += 1)       //servo 9 goes from 0 degrees to 180 degrees 
  for(pos10 = 180; pos10 < 0; pos10 += 1)    //servo 10 goes from 180 degrees to 0 degrees
  {                                         // in steps of 1 degree 
    servo9.write(pos9);                     // tell servo to go to position in variable 'pos' 
    delay(15);                              // waits 15ms for the servo to reach the position 
    servo10.write(pos10);
    delay(15);
  } 
  
  
  for(pos9 = 180; pos9>=1; pos9-=1)         // goes from 180 degrees to 0 degrees 
  for(pos10 = 0; pos10>=1; pos10-=1)        // goes from 0 degrees to 180 degrees
  {                                
    servo9.write(pos9);                     // tell servo to go to position in variable 'pos' 
    delay(15);                              // waits 15ms for the servo to reach the position 
    servo10.write(pos10);
    delay(15);
  } 
}

thanks

#2

Ok never mind :stuck_out_tongue: , I finally got it myself, I used this simple code, was lot easier.

this worked.

#include <Servo.h>


Servo servo9;
Servo servo10; // Define our Servo

void setup()
{
   servo9.attach(9);   // servo on digital pin 9
   servo10.attach(10); // servo on digital pin 10
}

void loop()
{
   servo10.write(0);  // Turn Servo Left to 45 degrees
   servo9.write(180);
   delay(1000);          // Wait 1 second
   servo10.write(180);   // Turn Servo Left to 0 degrees
   servo9.write(0);
   delay(1000);          // Wait 1 second
}
#3

Below is a typical way to mirror servo positions (n is the servo command position). Sometimes used with bots that use continuous rotation servos for the drive wheels.

   servo10.write(n); 
   servo9.write(180-n);
#4