Joystick on A0, A1 and pin 2, on an Arduino Uno

// Joystick module: X on A0, Y on A1, the press switch on pin 2.
//
//   VCC -> 5V   GND -> GND   VRx -> A0   VRy -> A1   SW -> pin 2
//
// The stick holds two potentiometers, one per axis. Centered, each sits
// half way and reads about 512; pushed to an end it reads near 0 or near
// 1023. Pressing the stick down closes a switch to ground, so pin 2 has the
// pull-up turned on and reads LOW while the stick is pressed.
//
// Drag the stick on the canvas, or click it to press it.

const int SW_PIN = 2;
const int X_PIN = A0;
const int Y_PIN = A1;

const char *direction(int x, int y) {
  if (x < 200) return "left";
  if (x > 823) return "right";
  if (y < 200) return "up";
  if (y > 823) return "down";
  return "center";
}

void setup() {
  pinMode(SW_PIN, INPUT_PULLUP);
  Serial.begin(9600);
  Serial.println("Mokxi Uno: joystick on A0, A1 and pin 2");
}

void loop() {
  int x = analogRead(X_PIN);
  int y = analogRead(Y_PIN);
  bool pressed = digitalRead(SW_PIN) == LOW;
  Serial.print("X: ");
  Serial.print(x);
  Serial.print("  Y: ");
  Serial.print(y);
  Serial.print("  switch: ");
  Serial.print(pressed ? "pressed" : "up");
  Serial.print("  ");
  Serial.println(direction(x, y));
  delay(500);
}