#include <Servo.h>

Servo myServo;           
int servoPin = 11;        
int leftButtonPin = 10;   
int rightButtonPin = 9; 
int servoAngle = 90;    

void setup() {
  myServo.attach(servoPin);  
  pinMode(leftButtonPin, INPUT_PULLUP);   
  pinMode(rightButtonPin, INPUT_PULLUP); 
  myServo.write(servoAngle);  
}

void loop() {

  if (digitalRead(leftButtonPin) == LOW) {
   
    myServo.write(0);
    delay(500);  
    while (digitalRead(leftButtonPin) == LOW) {
      delay(10);  
    }
  }
  
  // 
  if (digitalRead(rightButtonPin) == LOW) {
 
    myServo.write(90);
    delay(500); 
    while (digitalRead(rightButtonPin) == LOW) {
      delay(10); 
    }
  }
}