#include <Servo.h>  // add servo library
// constants won't change. They're used here to set pin numbers:
const int buttonPin = 2;  // the number of the pushbutton pin
Servo myservo;
int val;
int pos = 0;
// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status
int i = 0; // variable for changing functions


void setup() {
  // initialize the LED pin as an output:
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(8, OUTPUT);
  myservo.attach(9);

  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    delay(1000);
    i += 1;
  }

  if (i == 1) {
    digitalWrite(11, HIGH);
    digitalWrite(10, LOW);
    digitalWrite(8, LOW);
    val = analogRead(3);
    val = map(val, 0, 1023, 0, 180);
    myservo.write(val);
    delay(15);
  }
  else if (i == 2) {
    digitalWrite(11, LOW);
    digitalWrite(10, HIGH);
    digitalWrite(8, LOW);
     // goes from 0 degrees to 180 degrees
      // in steps of 1 degree
      myservo.write(90);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15ms for the servo to reach the position
    
  }
  else if (i == 3) {
    digitalWrite(11, LOW);
    digitalWrite(10, LOW);
    digitalWrite(8, HIGH);
    for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
      // in steps of 1 degree
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15ms for the servo to reach the position
    }
    for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15ms for the servo to reach the position
    }
    i = 0;
  }
  

}