#include <Servo.h>

Servo myservo;

int Seq = 0;
void setup() {

  Serial.begin(9600);
  myservo.attach(D0);  // attaches the servo on pin 9 to the servo object
  pinMode(D1, INPUT_PULLUP);
  pinMode(D2, INPUT_PULLUP);
  pinMode(D3, INPUT_PULLUP);

}

void loop() {
  if (digitalRead(D1) == LOW) {
    Seq = 1;
  }
  if (digitalRead(D2) == LOW) {
    Seq = 2;
  }
  if (digitalRead(D3) == LOW) {
    Seq = 3;
  }

  if (Seq == 1) {
    loop1 ();
  }
  if (Seq == 2) {
    loop2 ();
  }
  if (Seq == 3) {
    loop3 ();
  }

}
void loop1 () {
  Serial.println("loop1 running");
  myservo.write(0);      
  delay(2000);
  for (int A = 0; A < 91; A++) {
    myservo.write(A);       // 0 to 90
    delay(10);
  }
  delay(2000);
  
  for (int A = 90; A < 181; A++) {
    myservo.write(A);      // 90 to 180
    delay(10);
  }
  delay(2000);
  
  for (int A = 180; A > 89; A--) {
    myservo.write(A);      // 180 to 90
    delay(10);
  }
  delay(2000);
  
  for (int A = 90; A > (-1); A--) {
    myservo.write(A);      // 90 to 0
    delay(10);
  }
  delay(2000);
}

void loop2 () {
  Serial.println("loop2 running");
  myservo.write(0);      delay(2000);
  for (int A = 0; A < 91; A++) {
    myservo.write(A);       // 0 to 90
    delay(10);
  }
  delay(2000);

  for (int A = 90; A > (-1); A--) {
    myservo.write(A);      // 90 to 0
    delay(10);
  }
  delay(2000);
}

void loop3 () {
  Serial.println("loop3 running");
  myservo.write(0);      
  delay(2000);
}