#include <Servo.h>

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position
int redbut = 6;
int grbut = 7;

int step = 10;

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(redbut, INPUT_PULLUP);
  pinMode(grbut, INPUT_PULLUP);
  myservo.write(pos);  
}

void loop() {
  if ((digitalRead(redbut)== LOW)){
    if (pos<180) {
      pos+=step;
    myservo.write(pos);  
     
    delay(500);
    }
  }
    if ((digitalRead(grbut)== LOW)){
      if (pos>0){
        pos-=step;
        myservo.write(pos);   
      
      delay(500); 
      }
  }

}