// Analog joystick with direction detection
// XIAO RP2040
// VRX -> A0
// VRY -> A1
// VCC -> 3V3
// GND -> GND

const int pinX = A0;
const int pinY = A1;

int centerX = 0;
int centerY = 0;

int deadZone = 200; // Dead zone to avoid noise around the center

void setup() {
  Serial.begin(115200);
  delay(2000); // Do not touch the joystick during calibration

  // Automatic center calibration
  centerX = analogRead(pinX);
  centerY = analogRead(pinY);

  Serial.println("Calibrated center:");
  Serial.print("X: ");
  Serial.println(centerX);
  Serial.print("Y: ");
  Serial.println(centerY);
}

void loop() {
  int xValue = analogRead(pinX);
  int yValue = analogRead(pinY);

  int stateX = 0;   // -1 = LEFT, 0 = CENTER, 1 = RIGHT
  int stateY = 0;   // -1 = DOWN, 0 = CENTER, 1 = UP

  // X axis detection
  if (xValue < centerX - deadZone) {
    stateX = -1; // LEFT
  } else if (xValue > centerX + deadZone) {
    stateX = 1; // RIGHT
  }

  // Y axis detection (inverted axis)
  if (yValue < centerY - deadZone) {
    stateY = 1; // UP
  } else if (yValue > centerY + deadZone) {
    stateY = -1; // DOWN
  }

  // Serial Monitor output
  Serial.print("X: ");
  Serial.print(xValue);
  Serial.print(" | Y: ");
  Serial.print(yValue);

  Serial.print(" | PosX: ");
  if (stateX == -1) Serial.print("LEFT");
  else if (stateX == 1) Serial.print("RIGHT");
  else Serial.print("CENTER");

  Serial.print(" | PosY: ");
  if (stateY == -1) Serial.print("DOWN");
  else if (stateY == 1) Serial.print("UP");
  else Serial.print("CENTER");

  Serial.println();

  delay(100);
}