#define VERT_PIN A0
#define HORZ_PIN A1
#define SEL_PIN  2

void setup() {
  Serial.begin(9600);

  pinMode(VERT_PIN, INPUT);
  pinMode(HORZ_PIN, INPUT);
  pinMode(SEL_PIN, INPUT_PULLUP);
}

void loop() {
  int vert = analogRead(VERT_PIN);
  int horz = analogRead(HORZ_PIN);
  bool selPressed = digitalRead(SEL_PIN) == LOW;

  Serial.println(selPressed);
}