Use onboard LED

platformio.ini

@@ -11,6 +11,9 @@ framework = arduino
 build_flags =
     -D ARDUINO_USB_MODE=1
     -D ARDUINO_USB_CDC_ON_BOOT=1
+    -D STATUS_LED_PIN=8
+    -D STATUS_LED_ON=LOW
+    -D STATUS_LED_OFF=HIGH
 
 board_upload.flash_size = 4MB
 board_build.flash_mode = dio

src/main.cpp

@@ -90,6 +90,21 @@ enum HomingState {
 };
 HomingState homingState = HOME_IDLE;
 
+// ─── LED globals ──────────────────────────────────────────────────
+#ifndef STATUS_LED_PIN
+  #ifdef LED_BUILTIN
+    #define STATUS_LED_PIN LED_BUILTIN
+  #endif
+#endif
+
+#ifndef STATUS_LED_ON
+  #define STATUS_LED_ON HIGH
+  #define STATUS_LED_OFF LOW
+#endif
+
+unsigned long lastBlinkTime = 0;
+bool ledState = false;
+
 // ─── Forward declarations ─────────────────────────────────────────
 void parseCommand(const String &cmd);
 void sendPosition();
@@ -247,6 +262,11 @@ void setup() {
   delay(1000); // Wait for USB CDC to enumerate
   Serial.println("\n[BOOT] WijiBoard Stepper Controller");
 
+#ifdef STATUS_LED_PIN
+  pinMode(STATUS_LED_PIN, OUTPUT);
+  digitalWrite(STATUS_LED_PIN, STATUS_LED_OFF);
+#endif
+
   // ── Init steppers ──────────────────────────────────────────
   stepper1.setMaxSpeed(DEFAULT_SPEED);
   stepper1.setAcceleration(DEFAULT_ACCEL);
@@ -366,6 +386,28 @@ void loop() {
       sendPosition();
     }
   }
+
+  // LED state management
+#ifdef STATUS_LED_PIN
+  if (moving) {
+    unsigned long now = millis();
+    if (now - lastBlinkTime >= 150) { // 150ms blink interval
+      lastBlinkTime = now;
+      ledState = !ledState;
+      digitalWrite(STATUS_LED_PIN, ledState ? STATUS_LED_ON : STATUS_LED_OFF);
+    }
+  } else if (bleConnected) {
+    if (!ledState) {
+      digitalWrite(STATUS_LED_PIN, STATUS_LED_ON);
+      ledState = true;
+    }
+  } else {
+    if (ledState) {
+      digitalWrite(STATUS_LED_PIN, STATUS_LED_OFF);
+      ledState = false;
+    }
+  }
+#endif
 }
 
 // ─── Homing Routines ──────────────────────────────────────────────