[WIP] Generate ISO-style technical drawing for Magic Cane

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Objective

Use the Murphy System's AsBuiltGenerator (from IKNOWINOT/Murphy-System) to produce an ISO-style technical drawing of the Magic Cane. The drawing should be committed as documentation in the IKNOWINOT/Magic_cane repository.

Context

Magic Cane Hardware

The Magic Cane is a blind-assist navigation system (ESP32-S3-based) with the following sensor/connectivity suite (from docs/architecture.md and docs/bom.md):

Cane Sensor & Connectivity Suite:

Component	Bus	Purpose
4× VL53L5CX ToF	I²C (multiplexed via TCA9548A)	Near-field 8×8 zone ranging in 4 quadrants
1× TFmini-S LiDAR	UART1	Forward long-range distance (12 m)
1× VL53L1X downward ToF	I²C	Drop-off / stair detection
BNO086 IMU	I²C	Orientation, step detection, tilt
SIM7080G Cellular Modem	UART2	LTE Cat-M1/NB-IoT advisory uplink
Nano-SIM Slot	—	Multi-carrier: T-Mobile, AT&T, Verizon
ESP32-S3-DevKitC-1	—	Main MCU with BLE + Wi-Fi
LiPo Battery 3.7V 2000mAh	—	Power with TP4056 USB-C charge board

360° Haptic Belt (companion device):

Component	Bus	Purpose
ESP32-S3-DevKitC-1	—	Belt MCU with BLE + Wi-Fi
8× ERM Vibration Motors	GPIO (via DRV2605L drivers)	Directional haptic feedback
8× DRV2605L Motor Drivers	I²C	Haptic driver ICs
BNO086 IMU	I²C	Belt orientation sensor
LiPo Battery 3.7V 1200mAh	—	Power with TP4056 USB-C charge board

Communication Protocol (Cane → Belt, BLE at 10 Hz):

• Byte 0: Header 0xCA
• Bytes 1: Sequence number
• Bytes 2–9: Motor intensities [0–255] for 8 belt motors
• Byte 10: Flags (bit 0 = emergency-stop pattern)
• Byte 11: Checksum (XOR of bytes 0–10)

Murphy System's AsBuiltGenerator

The Murphy System (IKNOWINOT/Murphy-System) includes an AsBuiltGenerator class in Murphy System/src/as_built_generator.py that generates control diagrams from equipment specifications. Key capabilities:

• AsBuiltGenerator.from_equipment_spec(spec, system_name) → ControlDiagram
• AsBuiltGenerator.generate_point_schedule(diagram) → CSV-ready control point table
• AsBuiltGenerator.generate_schematic_description(diagram) → text schematic with equipment, instruments, notes
• AsBuiltGenerator.export_as_built(diagram, fmt) → JSON export
• DrawingDatabase for deduplication and reference enrichment
• DrawingElement types include: EQUIPMENT_TAG, INSTRUMENT_TAG, SENSOR, CONTROLLER, SIGNAL_WIRE, POWER_WIRE, CONTROL_WIRE, etc.
• PointScheduleEntry with point_name, point_type (AI/AO/DI/DO), description, engineering_units

The Murphy System also has a REST API endpoint: POST /api/industry/as-built that can generate control diagrams from equipment specs.

Requirements

1. Create a Python script: docs/generate_iso_drawing.py

This script should:

• Import/use the Murphy System's AsBuiltGenerator data model patterns (replicate the key dataclasses locally if needed, since Murphy-System is a separate repo)
• Define the Magic Cane's equipment spec covering ALL components across both the cane and belt
• Generate an ISO-style isometric/technical drawing in text/ASCII art format that shows:
  • The cane shaft with all sensor positions (4× VL53L5CX in quadrants, TFmini-S forward, VL53L1X downward)
  • The ESP32-S3 MCU and its bus connections (I²C, UART1, UART2)
  • The TCA9548A I²C multiplexer
  • The SIM7080G cellular modem with LTE antenna
  • The BNO086 IMU
  • The LiPo battery and USB-C charge board
  • The 360° haptic belt shown separately with 8 motors around the circumference
  • BLE connection between cane and belt
  • A proper ISO drawing title block with: project name, drawing number, revision, date, scale notation

2. Generate the actual drawing: docs/magic_cane_iso_drawing.txt

The script should output a comprehensive text-based ISO-style drawing file that includes:

• Sheet 1: System Overview — Isometric view showing cane + belt + phone as three connected subsystems
• Sheet 2: Cane Control Diagram — All sensor connections to ESP32-S3, showing I²C bus (with MUX), UART1, UART2, BLE radio
• Sheet 3: Belt Wiring Diagram — 8 motors with DRV2605L drivers, BNO086 IMU, ESP32-S3 MCU
• Sheet 4: Point Schedule — Table of all control/sensor points (AI/AO/DI/DO classification)

3. Generate a JSON export: docs/magic_cane_as_built.json

Using the Murphy System's export_as_built() format:

{
  "format": "json",
  "generated_at": "<ISO timestamp>",
  "diagram": { ... },
  "point_count": <n>,
  "element_count": <n>,
  "summary": "..."
}

ISO Drawing Standards to Follow

• Use first-angle projection (ISO standard)
• Include proper line types: continuous thick (visible edges), continuous thin (dimension/leader lines), dashed (hidden edges)
• Use ASCII representations: ═══ for thick lines, ─── for thin lines, - - - for dashed/hidden
• Include dimension annotations where mean...

This pull request was created from Copilot chat.

---

⌨️ Start Copilot coding agent tasks without leaving your editor — available in VS Code, Visual Studio, JetBrains IDEs and Eclipse.