#include <Servo.h>

Servo myservo;  // create servo object to control a servo
int button_pin = 4;
int button_value;

int lastvalue;
int pos = 0; 

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(button_pin, INPUT);

  myservo.write(pos);
  lastvalue = 0;

  Serial.begin(9600);
}
void loop() {
  button_value = digitalRead(button_pin);
  Serial.print("button_value = ");
  Serial.println(button_value);
  // if (button_value == 1) {
  //   myservo.write(0);
  // } else if (button_value == 0) {
  //   myservo.write(180);
  // }

  // int value = digitalRead(Run_Button);
  if (lastvalue != button_value) {
    lastvalue = button_value;
    Serial.print("lastvalue = ");
    Serial.println(lastvalue);
    if (button_value == 1) {
      for (pos=0; pos<=180; pos++){
        myservo.write(pos);
        delay(5);
      }
    }
    if (button_value == 0) {
      for (pos=180; pos>=0; pos--){
        myservo.write(pos);
        delay(5);
      }
    }
  }

    //   if (pos>0) // Check that the position won't go lower than 0°
    // {
    //   arm.write(pos); // Set the arm's position to "pos" value
    //   pos-=step; // Decrement "pos" of "step" value
    //   delay(5); // Wait 5ms for the arm to reach the position
    // }
  delay(100);
}