#include<Servo.h> 
int button = 7;  
int button1 = 3;  
int SERVO_PIN  = 9; 
Servo servo;  
int pos = 0;  

void  setup() 
{
  Serial.begin(9600);
  servo.attach(SERVO_PIN);  
  pinMode(button, INPUT_PULLUP);  
  pinMode(button1, INPUT_PULLUP); 
}

void loop() 
{
  if (digitalRead(button) ==  LOW) 
  { 
    pos++;  
    delay(5); 
    servo.write(pos); 
    Serial.println(pos);
  }
  if (digitalRead(button1) == LOW)
   { 
    pos--;  
    delay(5); 
    servo.write(pos); 
    Serial.println(pos);
  }
}