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+# HubAudio Engineering Principles
+
+**Document:** Engineering Principles
+
+**Version:** 0.1 (Draft)
+
+**Status:** Draft
+
+**Applies to:** Entire HubAudio Project
+
+---
+
+# 1. Purpose
+
+This document defines the engineering principles that govern the design,
+development, documentation and maintenance of the HubAudio platform.
+
+These principles apply equally to:
+
+- Hardware
+- Firmware
+- Documentation
+- Architecture
+- Development tools
+
+Every engineering decision shall be consistent with these principles.
+
+Whenever a principle cannot be respected, the reason shall be documented
+through an Architecture Decision Record (ADR).
+
+---
+
+# 2. Vision
+
+HubAudio is not simply an electronic board.
+
+HubAudio is an embedded digital audio platform designed to evolve over
+many years while remaining understandable, maintainable and reliable.
+
+The project values engineering quality over feature quantity.
+
+Every design decision should reduce complexity rather than increase it.
+
+---
+
+# 3. Core Values
+
+The project follows these values, listed in order of importance.
+
+1. Understandability
+2. Maintainability
+3. Reliability
+4. Modularity
+5. Extensibility
+6. Performance
+
+Performance is important.
+
+Understanding the system is more important.
+
+---
+
+# 4. Fundamental Principle
+
+## EP-001 — Code That Fits in Your Head
+
+This is the fundamental engineering principle of HubAudio.
+
+The concept applies to every engineering artifact.
+
+An engineering artifact includes:
+
+- Source code
+- Electrical schematics
+- PCB layout
+- Documentation
+- Architecture diagrams
+- Firmware modules
+- Test procedures
+- Design notes
+
+Every engineering artifact should remain understandable by a single
+engineer during a normal working session.
+
+When understanding an artifact requires reading many unrelated parts of
+the project, the design should be reconsidered.
+
+Complexity shall never be removed by hiding it elsewhere.
+
+Complexity shall instead be isolated inside the component responsible
+for it.
+
+---
+
+### EP-001.a — One Sheet, One Story
+
+Each schematic sheet shall describe one subsystem.
+
+Examples:
+
+- ESP32 System Controller
+- Power Management
+- DSP Engine
+- Radio Engine
+- Bluetooth Engine
+- USB Interface
+
+A schematic shall never mix unrelated functions simply to reduce the
+number of pages.
+
+Readability is always preferred over compactness.
+
+---
+
+### EP-001.b — One Document, One Topic
+
+Each document shall describe one subject.
+
+If a document becomes too large, it should be divided into multiple
+documents.
+
+Documentation shall remain easy to navigate.
+
+---
+
+### EP-001.c — One Module, One Responsibility
+
+Each firmware module shall implement one responsibility only.
+
+Modules communicate through interfaces.
+
+Implementation details remain internal.
+
+---
+
+### EP-001.d — One PCB Area, One Function
+
+PCB placement should reflect the logical architecture.
+
+Subsystems should remain visually identifiable.
+
+Power, DSP, Radio, Bluetooth and Controller sections should remain
+clearly separated whenever practical.
+
+---
+
+# 5. Engineering Principles
+
+## EP-002 — Single Responsibility
+
+Every hardware and software component shall have one clearly defined
+responsibility.
+
+Responsibilities shall never overlap.
+
+---
+
+## EP-003 — Architecture Before Implementation
+
+The design process always follows this order:
+
+Architecture
+
+↓
+
+Documentation
+
+↓
+
+Implementation
+
+↓
+
+Verification
+
+Implementation shall never drive architecture.
+
+---
+
+## EP-004 — Hardware Independence
+
+Firmware shall communicate with logical devices.
+
+Hardware details shall remain confined inside the Hardware Abstraction
+Layer whenever practical.
+
+---
+
+## EP-005 — Modular Hardware
+
+Each subsystem should, whenever technically possible, provide:
+
+- Independent power control
+- Independent reset
+- Diagnostic capability
+- Firmware update capability
+
+---
+
+## EP-006 — Digital First
+
+Audio shall remain digital until analog conversion is explicitly
+required.
+
+---
+
+## EP-007 — Observable System
+
+Every subsystem shall expose sufficient diagnostic information.
+
+A system that cannot be observed cannot be maintained efficiently.
+
+---
+
+## EP-008 — Serviceability
+
+Maintenance shall be considered from the beginning of the project.
+
+Firmware update, diagnostics and hardware verification are part of the
+system architecture.
+
+They are not optional features.
+
+---
+
+## EP-009 — Documentation is Part of the Product
+
+Documentation is part of the engineering deliverable.
+
+Every important design decision shall be documented.
+
+Outdated documentation shall be considered a defect.
+
+---
+
+## EP-010 — Continuous Improvement
+
+Engineering decisions are based on evidence.
+
+Whenever a better solution becomes available, it shall be evaluated
+using objective engineering criteria.
+
+Previous decisions are never protected by pride.
+
+---
+
+# 6. Engineering Rules
+
+The following practical rules derive directly from these principles.
+
+- Small classes
+- Small functions
+- Explicit interfaces
+- No hidden side effects
+- Clear ownership
+- Minimal coupling
+- Meaningful names
+- Predictable behaviour
+
+---
+
+# 7. Definition of Done
+
+A development activity is complete only when:
+
+✓ Implementation completed
+
+✓ Documentation updated
+
+✓ Review completed
+
+✓ Tests completed
+
+✓ Future maintenance considered
+
+---
+
+# 8. Scope
+
+These principles apply to every future revision of HubAudio unless
+explicitly superseded by a newer approved version.
+
+---
+
+# 9. References
+
+- ADR-000 — Engineering Principles
+
+- Mark Seemann
+  *Code That Fits in Your Head*
+
+- Robert C. Martin
+  *Clean Architecture*
+
+- John Ousterhout
+  *A Philosophy of Software Design*