Godot + Arduino series: companion project code

Self-contained project code for the "Godot Isn't Just for Games" series:
Arduino sketches, the Python serial<->UDP bridge, and the Godot 4 projects,
one folder per article.

godot-arduino-1-led-first-light/README.md

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+# Part 1 — Your First Arduino Round-Trip
+
+Code for [*"Godot Isn't Just for Games: Your First Arduino Round-Trip"*](https://codebycandle.com/blog/godot-arduino-led-first-light).
+
+A button in a Godot 4 scene reaches down a USB cable — through a Python-to-UDP
+bridge — and lights a real LED on an Arduino Uno.
+
+## Contents
+
+```
+arduino/
+  LedBasics/LedBasics.ino   # reads L1/L0 off serial, drives the LED on D13
+  bridge/bridge.py          # serial <-> UDP relay (run this, leave it running)
+  bridge/ledtest.py         # quick standalone LED blink test (no Godot)
+godot/
+  ArduinoGodot/             # Godot 4 project: one styled toggle button
+```
+
+## Wiring
+
+D13 → 220 Ω resistor → LED long leg (anode); LED short leg (cathode) → GND.
+No breadboard? The Uno's onboard LED is already on D13.
+
+## Run it
+
+1. **Flash** `arduino/LedBasics/LedBasics.ino` to the Uno (Arduino IDE, 115200 baud).
+2. **Bridge:** `pip install pyserial`, then `python arduino/bridge/bridge.py`. Leave it running.
+3. **Godot:** open `godot/ArduinoGodot/` in Godot 4, press Play, click the button.
+
+The bridge auto-detects the board and reconnects if the cable pops out.