#include <Servo.h>

Servo saltservo; 
int Open = 180; //type the servo motor open angle 
int Close = 10;  //type the servo motor close angle 
void setup() {
  // put your setup code here, to run once:
  saltservo.attach(9);    //servo motor dpin 9
  pinMode(10, INPUT);   //button dpin 10
}

void loop() {
  // put your main code here, to run repeatedly:
if (digitalRead(10)==LOW){  //if button not pressed
  saltservo.write(Open);
}
else{
  saltservo.write(Close);
}
}