/******************************************************
 * Robot Car Joystick Transmitter (Arduino Nano + LoRa)
 ******************************************************/

#include <SPI.h>
#include <LoRa.h>

// ================= USER SETTINGS =====================
// LoRa pins
#define LORA_SS   10
#define LORA_RST  9
#define LORA_DIO0 2

// Joystick pins
#define JOY_Y A3
#define JOY_X A2

// Deadzone (ignore joystick noise)
#define DEADZONE 120
// =====================================================

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

  LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0);
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  Serial.println("Joystick Transmitter Ready!");
}

void loop() {
  int joyY = analogRead(JOY_Y);
  int joyX = analogRead(JOY_X);

  // Apply deadzone
  if (abs(joyY - 512) < DEADZONE) joyY = 512;
  if (abs(joyX - 512) < DEADZONE) joyX = 512;

  // Send data as "Y,X"
  String data = String(joyY) + "," + String(joyX);
  LoRa.beginPacket();
  LoRa.print(data);
  LoRa.endPacket();

  // Debug print
  Serial.print("Joystick Y: "); Serial.print(joyY);
  Serial.print(" | X: "); Serial.println(joyX);

  delay(100);
}