#include <Servo.h>

Servo myservo;  // Create servo object to control a servo
int buttonPin = 4;  // Push button pin
int pos = 0;  // Variable to store the servo position

void setup() {
  myservo.attach(3);  // Attach the servo on pin 3 to the servo object
  pinMode(buttonPin, INPUT_PULLUP);  // Initialize the push button pin as an input with internal pull-up resistor
}

void loop() {
  int buttonState = digitalRead(buttonPin);  // Read the state of the push button

  if (buttonState == LOW) {  // Button is pressed
    if (pos < 90) {
      pos++;  // Increment the servo position
      myservo.write(pos);  // Move the servo to the new position
      delay(15);  // Delay to allow the servo to move
    }
  }
}