#include <Servo.h>

int pos = 0;
Servo servo1;
Servo servo2;
Servo servo3;
Servo servo4;
Servo servo5;
Servo servo6;

void setup() {
  servo1.attach(2);
  servo2.attach(3);
  servo3.attach(4);
  servo4.attach(5);
  servo5.attach(6);
  servo6.attach(7);
}

void loop() {
  // Servos 1, 2, and 3 from position 45 to 135
  for (pos = 45; pos <= 135; pos++) {
    servo1.write(pos);
    servo2.write(pos);
    servo3.write(pos);
    delay(15);
  }

  // Servos 4, 5, and 6 from position 45 to 135
  for (pos = 45; pos <= 135; pos++) {
    servo4.write(pos);
    servo5.write(pos);
    servo6.write(pos);
    delay(15);
  }

  // Servos 1, 2, and 3 from position 135 to 45
  for (pos = 135; pos >= 45; pos--) {
    servo1.write(pos);
    servo2.write(pos);
    servo3.write(pos);
    delay(15);
  }

  // Servos 4, 5, and 6 from position 135 to 45
  for (pos = 135; pos >= 45; pos--) {
    servo4.write(pos);
    servo5.write(pos);
    servo6.write(pos);
    delay(15);
  }
}