Update main.py, tests, and add presets, circle test, and tool directory

tool/README.md

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+# LED Bar Configuration Tool
+
+A tkinter GUI tool for configuring LED bar settings via mpremote.
+
+## Features
+
+- Download `settings.json` from MicroPython device using mpremote
+- Edit LED configuration settings
+- Upload modified `settings.json` back to device
+- Load/save settings from/to local files
+
+## Requirements
+
+- Python 3.x with tkinter (usually included)
+- mpremote: `pip install mpremote`
+
+## Usage
+
+```bash
+python3 tool/led_config.py
+```
+
+Or make it executable:
+```bash
+chmod +x tool/led_config.py
+./tool/led_config.py
+```
+
+## Configuration Fields
+
+- **LED Pin**: GPIO pin number for LED strip
+- **Number of LEDs**: Total number of LEDs in the strip
+- **Color Order**: RGB or RBG color order
+- **Device Name**: Name identifier for the device
+- **Pattern**: Current LED pattern
+- **Color 1/Color 2**: Primary colors (hex format, e.g., #ff0000)
+- **Delay**: Pattern delay in milliseconds
+- **Brightness**: LED brightness level
+- **N1-N6**: Pattern-specific parameters
+- **AP Password**: WiFi access point password
+- **ID**: Device ID
+
+## Device Connection
+
+Default device is `/dev/ttyUSB0`. Change it in the "Device" field if your device is on a different port (e.g., `/dev/ttyACM0`, `COM3` on Windows).
+
+## Workflow
+
+1. Enter your device path (e.g., `/dev/ttyUSB0`)
+2. Click "Download Settings" to fetch current settings from device
+3. Edit any settings as needed
+4. Click "Upload Settings" to save changes back to device
+
+You can also:
+- Load settings from a local JSON file
+- Save current settings to a local JSON file
+
+