#include <Servo.h>

Servo myServo;
int button1 = 2;

void setup() {
  // put your setup code here, to run once:
  myServo.attach(4);
  pinMode(button1, INPUT_PULLUP);
  digitalWrite(button1, HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:

  if (digitalRead(button1) == LOW) {
    myServo.write(70);
    delay(250);
  } else {
    myServo.write(0);
    delay(250);
  }
}