#include <Arduino.h>
#include <Servo.h>

Servo servo[2];
unsigned long t,currentTime;

void setup(){

  Serial.begin(9600);

  servo[0].attach(9);
  servo[1].attach(10);

  servo[0].write(0);
  servo[1].write(0);

}

void loop(){

  currentTime = millis();

  if(currentTime - t > 100){

    t = currentTime;

    for(int i = 0; i <180; i++){

      servo[0].write(i);
      servo[1].write(i);

    }

  }

}