#include <Servo.h>
 Servo myservo; 
int pos = 0; 
const int pull_down = 2;
const int pull_up = 3;

void setup() {
myservo.attach(6);
pinMode(pull_down, INPUT);
pinMode(pull_up, INPUT);
}
void loop() {
if (digitalRead(pull_down)==1) {
myservo.write(90); 
}
if (digitalRead(pull_up)==1) {
myservo.write(0);
}
}