Add comprehensive documentation for all Arduino projects

README.md

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+# Arduino Learning Projects
+
+A collection of Arduino sketches for learning microcontroller programming and electronics. This repository contains progressively advanced projects that demonstrate various Arduino concepts and techniques.
+
+## Projects Overview
+
+### 1. Lesson 1 - Button Controlled LED
+**Location:** `learning/lesson1/`
+**Difficulty:** Beginner
+**Concepts:** Digital input/output, button debouncing
+
+A basic project that demonstrates how to read a button input and control an LED. When the button is pressed, the LED turns on; when released, it turns off.
+
+[View Project Details](learning/lesson1/README.md)
+
+### 2. Lesson 2 - LED For Loop
+**Location:** `learning/lesson2/`
+**Difficulty:** Beginner
+**Concepts:** For loops, sequential control, timing
+
+Demonstrates the use of for loops to control multiple LEDs in sequence. The sketch lights up 6 LEDs in order from low to high pin numbers, then reverses the pattern.
+
+[View Project Details](learning/lesson2/README.md)
+
+### 3. Traffic Light with Crosswalk
+**Location:** `learning/stop_light/`
+**Difficulty:** Intermediate
+**Concepts:** Interrupts, state management, complex timing patterns
+
+A traffic light simulator with pedestrian crosswalk functionality. Features a button-activated crosswalk that triggers when the traffic light is red, complete with flashing warning signals.
+
+[View Project Details](learning/stop_light/README.md)
+
+### 4. LED Distance Indicator
+**Location:** `learning/led_distance/`
+**Difficulty:** Advanced
+**Concepts:** External libraries, sensor integration, color mapping, analog output
+
+An advanced project using an HC-SR04 ultrasonic sensor to measure distance and display it visually on a NeoPixel LED strip. The color gradually transitions from red (close) to green (far) based on distance measurements.
+
+[View Project Details](learning/led_distance/README.md)
+
+## Getting Started
+
+### Prerequisites
+
+- Arduino IDE (download from [arduino.cc](https://www.arduino.cc/en/software))
+- Arduino board (Uno, Nano, or compatible)
+- Basic electronic components (LEDs, resistors, buttons, breadboard, jumper wires)
+- For advanced projects: NeoPixel strip, HC-SR04 sensor
+
+### Installation
+
+1. Clone this repository:
+   ```bash
+   git clone <repository-url>
+   cd arduino
+   ```
+
+2. Open the desired project's `.ino` file in Arduino IDE
+
+3. Connect your Arduino board via USB
+
+4. Select your board and port from Tools menu
+
+5. Upload the sketch to your Arduino
+
+### Required Libraries
+
+Some projects require external libraries:
+
+- **led_distance**: [Adafruit NeoPixel Library](https://github.com/adafruit/Adafruit_NeoPixel)
+
+Install libraries through Arduino IDE: Sketch → Include Library → Manage Libraries
+
+## Learning Path
+
+These projects are designed to be completed in order, with each building on concepts from previous lessons:
+
+1. Start with **Lesson 1** to understand basic digital I/O
+2. Progress to **Lesson 2** to learn control structures
+3. Move to **Stop Light** to explore interrupts and state management
+4. Complete **LED Distance** to work with sensors and external libraries
+
+## Contributing
+
+This is a personal learning repository. Feel free to fork and adapt these projects for your own learning journey.
+
+## License
+
+The code in this repository includes examples from the Arduino community and original work:
+- Lesson 1 and 2 are based on official Arduino tutorials (Public Domain)
+- Stop Light and LED Distance are original projects by Joshua Shanks
+
+## Additional Resources
+
+- [Arduino Official Tutorials](https://www.arduino.cc/en/Tutorial/HomePage)
+- [Arduino Language Reference](https://www.arduino.cc/reference/en/)
+- [Arduino Forum](https://forum.arduino.cc/)