#include <Servo.h>
Servo myservo;

#define sensor1 4
#define sensor2 5
int sensora;
int sensorb;
int slot;
void setup() {
 myservo.attach(9);
 Serial.begin(9600);
 pinMode(sensor1,OUTPUT);
 pinMode(sensor2,OUTPUT);
 myservo.write(0);
}

void loop() {
 sensora = digitalRead(sensor1);
 sensorb = digitalRead(sensor2);
 slot = 0;
 Serial.print("sensor 1 =");
 Serial.println(sensora);
 Serial.print("sensor 2 =");
 Serial.println(sensorb);
if(sensora == 1){
  myservo.write(90);
  slot++;
  while(1){
  sensorb = digitalRead(sensor2);
  if(sensorb ==1)break;
  delay(1000);
}
  delay(3000);
}
else{
 myservo.write(0); 
}
if(sensorb == 1){
  slot--;
  myservo.write(90);
  while(1){
  sensora = digitalRead(sensor1);
  if(sensora ==1)break;
  delay(1000);
}
  delay(3000);
}
else{
 myservo.write(0); 
}
delay(1000);
}