#include <Servo.h> //Import library

Servo servocrisduino;

void setup() {
  servocrisduino.attach(D0);
}

void loop() {
  servocrisduino.write(0);
  delay(2000);  // wait 2 seconds
  servocrisduino.write(90);
  delay(2000);  // wait 2 seconds
  servocrisduino.write(180);
  delay(2000);  // wait 2 seconds
}