#include <Servo.h>
Servo servo1;
int led1=4; int servo1_pin=3; int btn1=2;

void setup() {
  Serial.begin(9600);
  pinMode(btn1, INPUT_PULLUP);
  pinMode(led1, OUTPUT);
  servo1.attach(servo1_pin);
}

void loop() {
  if (digitalRead(btn1)==0);{
    digitalWrite(led1, HIGH);
    servo1.write(180);
  }else{
   digitalWrite(led1, LOW);
   servo1.write(0);
  }
}