# Changelog

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

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

## [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 | TBD | MVP Complete |
| 0.1.0-beta.2 | TBD | First DVT test runs |
| 0.1.0-beta.1 | TBD | 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 |