#include <Servo.h>
int servo_1_pin = 3;

Servo servo1;


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

}

void loop() {
  // put your main code here, to run repeatedly:
servo1.write(90);

delay(1000);
servo1.write(0);

delay(1000);

}