#include <Servo.h>
Servo myservo;
Servo yourservo;
int pos = 0;
int los = 90;
const int buttonPin = 8;
int i = 0;
int buttonState = 0;
void setup() {
  // put your setup code here, to run once:
  myservo.attach(9);
  yourservo.attach(10);
  pinMode(buttonPin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH){
    delay(100);
    i += 1;
  }

  if (i == 1){
    for(pos = 0;pos <= 90;pos += 1){
      myservo.write(pos);
      delay(15);
    }
    for(los = 90;los <= 180;los += 1){
      yourservo.write(los);
      delay(15);
    }
    i = 1;
  }
  else if(i == 2){
    for(pos = 90;pos >= 0;pos -= 1){
    myservo.write(pos);
    delay(15);
    }
    for(los = 180;los >= 90;los -= 1){
    yourservo.write(los);
    delay(15);
    }
    i = 0;
  }
}