py-dvt-ate/CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

[0.1.0] - 2025-12-04

Added

• Streamlit Dashboard Enhancement (Sprint 17)
  • HAL-based instrument control (no direct physics access)
  • Test execution page for running TempCo characterisation
  • Results viewer page with filtering and historical data
  • Form-based parameter controls preventing UI clunkiness
  • Live simulation charts with auto-start
• End-to-end integration tests covering full workflow
• Updated README with installation and usage instructions
• Proprietary licence

Changed

• Integration tests now run 100x faster with simulation time scaling
• Removed confusing pause/clear chart buttons from dashboard

Fixed

• CI release workflow now creates proper releases with changelog description

Technical

• Dashboard uses InstrumentFactory and InstrumentSet abstraction
• Embedded SimulationServer with threading synchronisation
• SQLite repository close() method for Windows file handle cleanup
• 259 unit tests, 12 integration tests all passing
• Coverage: 100% on core physics/instrument modules

[0.1.0-beta.2] - 2025-12-03

Added

• Test Executive Framework (Sprint 14)
  • TestContext dataclass providing runtime context for tests
  • ITest abstract base class defining test interface
  • TestLogger for recording measurements, results, and events
  • LimitChecker for evaluating pass/fail against specification limits
  • TestRunner for orchestrating test execution
  • SQLite-based TestRepository for persisting test data
  • Parquet measurement storage for efficient time-series data
• DVT Test Implementation (Sprint 15)
  • BaseDVTTest providing common test utilities
  • TempCo characterisation test (temperature coefficient measurement)
  • Temperature sweep with automatic thermal settling
  • Linear regression TempCo calculation (ppm/°C)
  • Comprehensive integration tests for end-to-end validation

Technical

• Test framework supports data logging, limit evaluation, and result persistence
• TempCo test demonstrates full end-to-end workflow: configure instruments → sweep temperature → measure → calculate → evaluate
• All framework and test components fully type-checked and linted

[0.1.0-beta.1] - 2025-12-02

Added

• Hardware Abstraction Layer (HAL) with instrument interface protocols
  • IThermalChamber protocol with temperature control methods
  • IPowerSupply protocol with voltage/current control and measurement
  • IMultimeter protocol with DC voltage, current, and resistance measurement
• Instrument drivers implementing HAL interfaces
  • ThermalChamberDriver implements IThermalChamber
  • PowerSupplyDriver implements IPowerSupply
  • MultimeterDriver implements IMultimeter
• Instrument factory pattern for backend abstraction
  • InstrumentSet dataclass containing chamber, PSU, and DMM
  • InstrumentConfig for specifying backend (simulator/pyvisa) and connection details
  • InstrumentFactory.create() for creating instrument sets from configuration
• Transport layer abstraction
  • Transport ABC defining connect/disconnect/read/write/query interface
  • TCPTransport implementation for TCP/IP connections
• Comprehensive test suite for HAL (16 tests)
  • Interface implementation verification
  • Factory pattern testing with mocked backends
  • Configuration validation

Changed

• Drivers now explicitly inherit from interface ABCs for maximum type safety
• Moved InstrumentServer to instruments/transport for better architecture

Technical

• ABC-based interfaces ensure compile-time interface compliance
• Factory pattern enables seamless switching between simulated and real hardware
• All HAL components fully type-checked with mypy strict mode

[0.1.0-alpha.3] - 2025-12-02

Added

• Async TCP server for exposing virtual instruments over network
• InstrumentServer class with multi-port, multi-client support
• Line-based SCPI protocol (newline-terminated commands/responses)
• SimulationServer wiring physics engine to all virtual instruments
• CLI serve command to start simulation server with configurable ports
• Integration tests for TCP server and instrument connectivity

Infrastructure

• SCPI foundation (Sprint 5): command parser with IEEE 488.2 support
• Virtual instrument base class with command dispatch
• Thermal chamber simulator (TEMP:SETPOINT, TEMP:ACTUAL?, TEMP:STAB?)
• Power supply simulator (VOLT, CURR, OUTP, MEAS commands)
• Multimeter simulator (MEAS:VOLT:DC?, MEAS:CURR:DC?, CONF, READ?)

[0.1.0-alpha.2] - 2025-12-02

Added

• Streamlit dashboard for interactive physics visualisation
• Real-time temperature charts (chamber, case, junction)
• Current state metrics display (voltages, currents, power, temperatures)
• Interactive controls in sidebar:
  • Temperature setpoint slider (-40°C to 125°C)
  • Input voltage slider (0-12V)
  • Load current slider (0-500mA)
  • Output enable toggle
  • Start/Stop/Reset simulation buttons
• Self-heating demonstration panel with:
  • Junction-case and case-ambient temperature rise display
  • Power dissipation chart
  • Thermal coupling explanation

[0.1.0-alpha.1] - 2025-12-02

Added

• Physics engine with thermal-electrical coupling
• First-order thermal response calculations for chamber and case
• Junction temperature calculation via thermal resistance (θ_jc)
• Self-heating effects from power dissipation
• LDO DUT model with temperature-dependent behaviour
  • Output voltage temperature coefficient (ppm/°C)
  • Quiescent current temperature coefficient
  • Dropout voltage temperature dependence
  • Power dissipation calculation
• Comprehensive physics engine test suite (13 tests)

[0.0.1] - 2025-12-01

Added

• Initial project scaffolding
• pyproject.toml with core dependencies
• Package directory structure with all subpackages
• Development tooling configuration (ruff, mypy, pytest)
• CLI entry point with version command
• Project documentation (requirements, technical specification, architecture decisions)
• Development plan with vertical slice approach
• CI/CD pipeline configuration

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Version History

Version	Date	Milestone
0.1.0	2025-12-04	MVP Complete
0.1.0-beta.2	2025-12-03	First DVT test runs
0.1.0-beta.1	2025-12-02	HAL complete
0.1.0-alpha.3	2025-12-02	Network ready
0.1.0-alpha.2	2025-12-02	Visual demo
0.1.0-alpha.1	2025-12-02	Physics engine
0.0.1	2025-12-01	Project scaffolding