#define LED1 10
#define LED2 9
#define LED3 8

#define S1 4
#define S2 2
#define S3 3

int s1state = 0;
int s2state = 0;
int s3state = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);

  pinMode(S1, INPUT);
  pinMode(S2, INPUT);
  pinMode(S3, INPUT);

  Serial.begin(9600);
  Serial.println("Serial port open");
}

void loop() {
  // put your main code here, to run repeatedly:
  s1state = digitalRead(S1);
  digitalWrite(LED1, s1state);
  s2state = digitalRead(S2);
  digitalWrite(LED2, s2state);
  s3state = digitalRead(S3);
  digitalWrite(LED3, s3state);

  Serial.print(s1state);
  Serial.print(s2state);
  Serial.print(s3state);

  Serial.println();
}