скетч для управления:

/*
LarryArm v0.1 Arduino Robot Arm test sketch to check servos and arm works.
*/
 
#include <Servo.h> 
 
Servo shoulder;
Servo elbow;
Servo wrist;
int pos = 0;
 
void setup()
{
  shoulder.attach(9);
  elbow.attach(10);
  wrist.attach(11);
}
 
void loop()
{
  for(pos = 0; pos < 180; pos += 1) 
  {
      shoulder.write(pos);
      elbow.write(pos);
      wrist.write(pos);
      delay(15);
  }
  for(pos = 180; pos>=1; pos-=1)
  {
    shoulder.write(pos);
    elbow.write(pos);
    wrist.write(pos);
    delay(15);
  }
}

Ссылки
Arduino robot arm larryarm