#define pinServo  1
void servoAttach(byte pin){
  pinMode(pin, OUTPUT);
}
void servoWrite(byte pin, byte angle){
  int pulseHigh = map(angle,0,180,430,2100);
  int pulseLow  = 20000-pulseHigh;
  for (int i=0;i<50;i++){
    digitalWrite(pin, HIGH);        
    delayMicroseconds(pulseHigh);     
    digitalWrite(pin, LOW);         
    delayMicroseconds(pulseLow);    
  }
}
#define pinButton 0
void setup() {
  servoAttach(pinServo);
  servoWrite(pinServo, 0);    
  pinMode(pinButton, INPUT);
}
void loop() {
  if (!digitalRead(pinButton)){
    servoWrite(pinServo, 90);
    delay(3000);
    servoWrite(pinServo, 0);
  }  
}