#include <Servo.h>
int servo_1_pin = 9;
int servo_2_pin = 10;
int servo_3_pin = 11;
Servo servo1;
Servo servo2;
Servo servo3;

void setup() {
  // put your setup code here, to run once:
servo1.attach(servo_1_pin);
servo2.attach(servo_2_pin);
servo3.attach(servo_3_pin);
}

void loop() {
  // put your main code here, to run repeatedly:
servo1.write(0);
servo2.write(0);
servo3.write(0);
delay(1000);
servo1.write(90);
servo2.write(0);
servo3.write(90);
delay(1000);
servo1.write(180);
servo2.write(0);
servo3.write(180);
delay(1000);
servo1.write(0);
servo2.write(90);
servo3.write(0);
delay(1000);
servo1.write(0);
servo2.write(180);
servo3.write(0);
delay(1000);
}