- Implement `ammeter-waveform.test.ts` to validate AC readings from a sine wave source.
- Create `capacitor-charge-transient.test.ts` to test the charging response of an RC circuit driven by a microcontroller pin.
- Introduce `esp32-rectifier-integration.test.ts` for testing rectifier behavior using QEMU and ESP32.
- Add helper functions in `esp32RectifierE2E.ts` for the rectifier test harness.
- Develop `voltmeter-waveform.test.ts` to ensure correct AC and DC readings from a sine wave source.
- Implement unit tests for waveform statistics in `waveform-stats.test.ts` to validate RMS, mean, peak, and interpolation functions.
- Create `waveformStats.ts` to provide statistical functions for time-domain waveform analysis.
- Implement `serial-batching.test.ts` to verify the behavior of `createSerialBatcher`, ensuring it coalesces multiple appends into a single flush, preserves byte order, and groups by board.
- Create `spice-rectifier-integration.test.ts` to test the end-to-end functionality of the Half-Wave Rectifier example, covering the entire simulation pipeline from input building to circuit solving.
- Add `spice-rectifier-live-repro.test.ts` to reproduce a live-app failure scenario, tracing through each layer of the simulation to identify potential failure points.
- Introduce `spice-signal-generator-tran.test.ts` to validate the behavior of the signal generator and ensure correct analysis type switching based on circuit components.
- Establish `serialBatcher.ts` to implement a batching mechanism for USART output, reducing the frequency of store updates and preventing React's maximum update depth error.
- Decoupled electrical simulation from the simulator store, ensuring SPICE is always active for accurate circuit analysis.
- Removed feature flag for electrical simulation, simplifying the state management.
- Preloaded SPICE engine at app start to eliminate latency during the first solve.
- Added comprehensive tests for MOSFET PWM LED behavior and NPN transistor switch functionality, ensuring correct current flow and response to pin states.
- Implemented diagnostics for floating input nodes in RC low-pass filter circuits, addressing singular matrix issues in SPICE simulations.
- Introduced active semiconductor metadata registry for better component management and simulation fidelity.
- Updated Vite configuration to force re-bundling of local wokwi-elements after component additions.
fix: increase timeout for compilation requests to 180 seconds
refactor: call recalculateAllWirePositions after loading examples
chore: update subproject commit for rp2040js to dirty state
chore: update subproject commit for wokwi-elements to dirty state
generate-sitemap.mjs was only scanning examples.ts for example IDs using a
textual regex. With the 40 new circuit examples living in a separate file
(examples-circuits.ts), they were missing from the generated sitemap.xml
and therefore invisible to search engines / SSR prerender URL list.
Now the generator reads both source files and merges their example IDs.
Also includes auto-applied formatting changes to generate-component-metadata.ts.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Previously examples.ts pushed to exampleProjects[] after declaration, which
some bundlers can treat as dead code under aggressive tree-shaking. This
also made HMR unreliable when examples-circuits.ts changed.
Now:
const legacyExamples = [...]
export const exampleProjects = [...legacyExamples, ...circuitExamples]
Single immutable export. Guaranteed to include all 150 examples at import
time. The gallery (ExamplesGallery.tsx) and SSR prerender (entry-server.tsx)
both pick up the new circuit examples automatically.
Also adds frontend/src/__tests__/examples-circuits.test.ts with 5 assertions
to catch future regressions (all circuit ids present, no duplicates, valid
required fields, expected categories covered).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds frontend/src/data/examples-circuits.ts with 40 new examples organized
into 6 categories, each demonstrating a specific analog/digital/electromech
concept that the SPICE engine can simulate end-to-end:
PASSIVE / ANALOG (10):
voltage-divider, rc-low-pass-filter, wheatstone-bridge,
ntc-temperature, led-current-limiting, parallel-resistors,
pot-adc-reader, photoresistor-light, multi-led-bar,
capacitor-charge-curve
TRANSISTOR / SEMICONDUCTOR (8):
npn-led-switch, pnp-high-side-switch, mosfet-pwm-led,
diode-rectifier, zener-regulator, schottky-reverse-protection,
bjt-common-emitter, darlington-high-current
OP-AMP (5):
opamp-inverting, opamp-voltage-follower, opamp-comparator,
opamp-difference, opamp-schmitt-trigger
LOGIC GATES (6):
and-gate-alarm, xor-toggle-detector, nand-sr-latch,
full-adder, binary-counter-leds, logic-probe
ELECTROMECHANICAL (4):
relay-led-switch, optocoupler-signal,
l293d-motor-control, l293d-speed-pwm
POWER / REGULATOR (3):
power-supply-7805, lm317-adjustable-psu, battery-voltage-monitor
BOARD-SPECIFIC (4):
esp32-dual-adc, mega-multi-led, nano-sensor-station,
esp32-pwm-led-rgb (uses ESP32 LEDC peripheral)
The new examples are appended to exampleProjects[] in examples.ts so the
existing gallery and category filters pick them up automatically.
test/test_circuit/test/spice_examples.test.js validates each example's
analog topology in ngspice — 45 individual assertions covering all 40
examples (plus extra cases for NTC/Zener sweeps and L293D direction).
Sandbox tally: 164 -> 209 tests, 7.9s runtime, all green.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Electrical simulation is now active by default (mode='spice' instead of
'off') — users no longer need to toggle the mode on manually. The engine
lazy-loads on first solve, so there is no startup cost penalty.
Changes:
- useElectricalStore: default mode = 'spice' when ELECTRICAL_SIM_ENABLED
- subscribeToStore: ADC_PIN_MAP expanded to all 18 board types (Uno, Nano,
Mega with 16 ADC channels, ATtiny85, RP2040 GP26-29, ESP32/S3/C3 GPIO
ADCs). Voltages from SPICE solutions now inject into MCU ADC peripherals
for all boards.
- BasicParts LED: reads branchCurrents from useElectricalStore when SPICE
is active. Brightness = clamp(|I_led| / 20mA, 0, 1) instead of boolean.
Subscribes to store changes to update in real time.
- ElectricalOverlay: shows per-wire voltage labels (gold monospace on dark
pill) using buildWireNetMap() which replicates the NetlistBuilder's
Union-Find to map wireId -> netName -> nodeVoltage. Summary pill shows
net count + solve time.
- NetlistBuilder: new export buildWireNetMap() for lightweight wire-to-net
resolution without running ngspice.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds 44 SPICE mappers, 58 custom metadata entries, and 12 visual
Web Components covering logic gates, transistors, op-amps, regulators,
sources, electromechanical parts and integrated-circuit packaging.
Fase 9 — component catalog expansion
------------------------------------
- 7 logic gates (AND/OR/NAND/NOR/XOR/XNOR + NOT) as SPICE B-sources
- 8 multi-input gates (AND/OR/NAND/NOR with 3 and 4 inputs)
- 9 transistors: 5 BJTs (incl. PNP 2N3906/BC557) + 4 MOSFETs (incl.
P-channel IRF9540/FQP27P06). NMOS refactored from Level=3 W=0.1
(hangs ngspice) to Level=1 with sane W/L
- 5 op-amps: LM358, LM741, TL072, LM324 with per-chip saturation
rails + opamp-ideal
- 4 linear regulators (7805, 7812, 7905, LM317) with dropout
- 3 batteries (9V, AA, coin-cell) with realistic ESR
- Signal generator (sine / square / DC)
- 2 Schottky diodes (1N5817, 1N5819) + photodiode (lux-driven
current source)
Fase 10 — electromechanical + ICs
---------------------------------
- Relay (SPDT): coil + L + S-switch with native hysteresis +
flyback diode, inverted-control trick for the NC contact
- Optocouplers 4N25 and PC817 (LED + CCCS with CTR=0.5 / 1.0)
- 7 74HC ICs as DIP-14 packages emitting 4 or 6 B-sources per
component (first mapper pattern emitting multiple device cards)
- 3 flip-flops (D, T, JK) — digital-sim only (edge detection is
not representable in ngspice .op)
- L293D dual H-bridge motor driver
Infrastructure
--------------
- scripts/component-overrides.json gains a _customComponents[] array
that lets new Velxio-only parts survive metadata regeneration
(previously applyOverrides() could only patch wokwi-elements
components that had already been scanned)
- scripts/generate-component-metadata.ts injects custom entries
before the patch loop
- New ComponentCategory values: 'logic', 'analog', 'electromech'
- frontend/src/components/DynamicComponent.tsx PASSIVE tracing
extended from just ['resistor','resistor-us'] to 9 two-terminal
passives with per-part pin name maps
- New CI workflow test-circuit.yml runs the sandbox on push/PR
- frontend-tests.yml regenerates metadata and fails if committed
JSON is stale
- Documented 2 new ngspice gotchas in circuit-emulation-gotchas.md:
unicode in netlist titles silently hangs the parser, and
MOSFET Level=3 + W=0.1m causes .op to hang
- 164/164 sandbox tests passing in ~9 s (was 88 pre-fase-9)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Implemented Bmp280Element as a custom web component for the BMP280 barometric sensor, including SVG representation and pin configuration.
- Created CircuitPreview component to render circuit thumbnails using SVGs of components, including support for various boards and components.
- Added a script to generate SVG files from wokwi-elements, ensuring proper formatting and structure for reliable rendering.
- Introduced a test HTML generation script to visualize component SVGs.
- Implemented ExampleDetailPage for individual example projects with SEO metadata.
- Updated routing to use ExampleDetailPage instead of ExampleLoaderPage.
- Enhanced sitemap generation to include example project URLs.
- Added prerendering support for example detail pages in the server entry.
- Improved SEO handling in ProjectByIdPage to dynamically set metadata based on project visibility.
- Refactored example ID extraction from examples.ts for sitemap generation.
- Updated console logs to reflect total URLs generated in sitemap.
refactor: Update wiring examples for E32 OLED integration; correct pin mappings for VCC, GND, DATA, and CLK
test: Improve unit tests for ESPIDFCompiler; add scenarios for library resolution and CMake patching
chore: Mark subproject commits as dirty for wokwi-libs
This commit introduces a detailed markdown document outlining the process of simulating DHT22 and HC-SR04 sensors on the ESP32 platform using Velxio's QEMU fork. The documentation covers the context of the simulation, key callbacks, problems encountered, and solutions implemented for both sensors. It includes architectural details, end-to-end testing procedures, and guidelines for adding new GPIO-timed sensors. The aim is to provide maintainers with a thorough understanding of the GPIO logic and the challenges faced during development.
- Updated the threshold for switching to data mode in MPU6050Slave from 2 to 3 WHO_AM_I reads to ensure correct chip identification.
- Enhanced comments in the code to clarify the sequence of I2C events during initialization.
- Added a new test file `test_mpu6050_emulation.py` to validate the MPU6050Slave state machine and ensure it handles the full Adafruit_MPU6050::begin() event sequence correctly.
- Updated existing tests to reflect the changes in the I2C handling logic.
- Modified `components-metadata.json` to update the generated timestamp.
- Marked submodules `rp2040js` and `wokwi-elements` as dirty to reflect local changes.
Two bugs causing "can't save project" reports:
1. SaveProjectModal: validate currentProject.id is a real UUID before
calling updateProject. If id is "none" or any non-UUID string, fall
through to createProject instead, avoiding PUT /api/projects/none.
2. ProjectByIdPage: call clearCurrentProject() when the project fetch
fails (404/403/error). Prevents stale project IDs from a previous
session polluting the store and triggering spurious update calls.
- Introduced I2C_SENSOR_MAP for pre-registering I2C sensors in the simulator store.
- Implemented I2C slave state machines for MPU6050, BMP280, DS1307, and DS3231 sensors in esp32_i2c_slaves.py.
- Added unit tests for I2C slave functionality covering BMP280, DS1307, DS3231, and I2CWriteSink.
- Updated the simulator store to handle I2C address resolution and sensor data management.
- Marked submodules as dirty in wokwi-libs for rp2040js and wokwi-elements.
- Implemented _MPU6050Slave and _BMP280Slave classes for I2C communication.
- Enhanced main function to register these sensors and handle I2C events.
- Updated sensor management to support MPU-6050, BMP280, DS1307, DS3231, SSD1306, and PCF8574.
- Added frontend examples for BMP280 weather station and SSD1306 OLED display.
- Modified Esp32Bridge to handle new I2C transaction events.
- Updated ProtocolParts to support ESP32 path for I2C devices.
- Enhanced useSimulatorStore to manage I2C transaction listeners.
Docker multi-arch:
- Dockerfile downloads arch-specific QEMU .so via TARGETARCH
- docker-publish.yml adds setup-qemu-action and platforms: linux/amd64,linux/arm64
- qemu-lcgamboa submodule updated (matrix build for both architectures)
LED fix:
- LEDs now require cathode wired to GND (or LOW GPIO) to light up
- Previously LEDs turned on with anode HIGH regardless of cathode connection
- Updated tests to verify anode+cathode behavior
Two bugs fixed:
1. SaveProjectModal was reading from the legacy global `files` array instead
of the active board's file group, causing projects to be saved with the
wrong board_type (e.g. 'arduino-uno' for ESP32 projects).
Now reads from fileGroups[activeBoard.activeFileGroupId] and uses
activeBoard.boardKind for board_type.
2. Error handling was always showing "Save failed." — now shows:
- "Server unreachable. Check your connection and try again." for network errors
- "Not authenticated. Please log in and try again." for 401 responses
- The server's detail message (with status code) for other errors
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Frontend WiFi detection via file-content scanning was unreliable because
fileGroups[board.activeFileGroupId] could be an empty array (not null),
bypassing the ?? fallback to editorState.files.
Fix: the ESP-IDF compiler now returns has_wifi:bool in its compile response.
The frontend stores this on the BoardInstance and uses it in startBoard()
instead of scanning file contents. The file-content scan is kept as a
fallback for boards that haven't been compiled in this session.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
startBoard() was reading useEditorStore.getState().files (the legacy global
array with the default Arduino sketch) instead of the board's specific file
group. This caused hasWifi to always be false for ESP32 boards, so QEMU
never received the -nic flag and WiFi never connected.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- handleRun now auto-compiles for ESP32/QEMU boards when no firmware is
available (same behavior as AVR/RP2040 boards)
- startBoard now reloads compiledProgram into the bridge if _pendingFirmware
was lost (e.g. after a page refresh between compile and run)
- Adds Esp32Bridge.hasFirmware() helper used by the store check
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace arduino-cli with ESP-IDF 4.4.7 for ESP32 compilation — Arduino-compiled
firmware crashes in QEMU (9-28 reboots) while ESP-IDF boots cleanly (0 reboots).
The new espidf_compiler translates Arduino WiFi/WebServer sketches to native
ESP-IDF C code, compiles with cmake+ninja, and merges into 4MB flash images.
Key changes:
- ESP-IDF compiler: translates WiFi.begin/WebServer to esp_wifi/esp_http_server
- ESP-IDF project template with QEMU-optimized sdkconfig (DIO, 40MHz, no WDT)
- WiFi status parser for ESP-IDF serial logs (wifi_status, ble_status events)
- IoT Gateway HTTP reverse proxy for ESP32 web servers
- WiFi/BLE auto-detection from sketch content + visual status icons
- Static IP 192.168.4.15 matching slirp DHCP first-client range
- Docker: new espidf-builder stage with ESP-IDF 4.4.7 toolchain
- 157 tests covering WiFi/BLE for both ESP32 (Xtensa) and ESP32-C3 (RISC-V)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Implemented ExampleLoaderPage to load examples by ID from the URL.
- Added ExampleLoaderPage route to App component.
- Created ShareModal for sharing project links with visibility toggle.
- Updated UserProfilePage to include share button for user projects.
- Enhanced ExamplesGallery with a copy link button for examples.
- Introduced utility function loadExample to streamline example loading and library installation.
- Updated project visibility management in useProjectStore.
- Added styles for new components and buttons.
- Updated .gitignore to include Arduino compilation byproducts.
ESP32-C3 already uses the QEMU backend via Esp32Bridge, not browser-side
emulation. This adds MicroPython support by including C3 in the supported
set, adding the C3 firmware variant to the loader, and bundling the
fallback firmware binary.
Also fixes misleading type comments that said "browser emulation" for C3
boards — they actually use QEMU backend.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Extends MicroPython support (Phase 2) to ESP32 Xtensa boards running on
QEMU. Firmware is downloaded from micropython.org, cached in IndexedDB,
and loaded into QEMU. User code is injected via the raw-paste REPL
protocol after the MicroPython REPL boots.
- Create Esp32MicroPythonLoader.ts for firmware download/cache
- Add raw-paste REPL injection (Ctrl+A → Ctrl+E → code → Ctrl+D) to Esp32Bridge
- Extend loadMicroPythonProgram in store for ESP32 path
- Add ESP32 default MicroPython content (GPIO 2 blink)
- Simplify SerialMonitor Ctrl+C/D to work for all MicroPython boards
- Bundle fallback firmware for ESP32 and ESP32-S3
- Add all ESP32 board variants to SerialMonitor tab maps
Closes#3 (Phase 2)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements MicroPython emulation for Raspberry Pi Pico boards running
entirely in the browser using rp2040js. Users can toggle between
Arduino C++ and MicroPython modes via a language selector dropdown.
Key changes:
- Add LanguageMode type and BOARD_SUPPORTS_MICROPYTHON to board types
- Create MicroPythonLoader.ts: UF2 firmware parser, LittleFS filesystem
builder (via littlefs-wasm), IndexedDB firmware caching
- Extend RP2040Simulator with loadMicroPython() method using USBCDC for
serial REPL instead of UART
- Add setBoardLanguageMode and loadMicroPythonProgram store actions
- Update EditorToolbar with language toggle and MicroPython compile flow
- Enhance SerialMonitor with REPL label, Ctrl+C/D support
- Bundle MicroPython v1.20.0 UF2 firmware as fallback in public/firmware/
- Update useEditorStore to create main.py default for MicroPython mode
Closes#3
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Closes#14
- Right-click context menu on boards with "Remove board" option
- Delete/Backspace key removes the active board (when no component selected)
- Confirmation dialog before removal showing connected wire count
- Removing a board also removes all connected wires and cleans up
file groups, simulators, bridges, and VFS
- Cannot remove the last remaining board (button disabled + guard)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Closes#81
- Add `codeChangedSinceLastCompile` dirty flag to useEditorStore
- Play button now triggers compilation automatically when no compiled
program exists or code has changed since last compile
- Show compilation progress during auto-compile before run
- If compilation fails, show errors instead of running stale code
- Keep separate Compile button for manual compile-only workflow
- Play button always enabled (disabled only while running/compiling)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Resize image.png from 2816x1536 to 1400x764 (7.3MB → 1.9MB, -74%)
- Add image.webp version (201KB, -97% vs original)
- Update nginx.conf to auto-serve WebP via Accept header negotiation
- Update LandingPage.tsx to use <picture> with WebP source + lazy loading
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Added tracking for simulation events: start, stop, and reset.
- Implemented tracking for library manager interactions, including library installations.
- Enhanced project management tracking with save and create project events.
- Integrated tracking for user authentication events: sign-up and login.
- Added tracking for CTA clicks on landing and SEO pages.
- Updated analytics utility functions to support new tracking events.
- Improved GitHub and Discord link tracking in the app header.
- Refactored existing components to utilize new tracking functions for better user engagement insights.
- Created Esp32S3SimulatorPage.tsx with SEO content and FAQ section.
- Created Esp32SimulatorPage.tsx with SEO content and FAQ section.
- Created RaspberryPiPicoSimulatorPage.tsx with SEO content and FAQ section.
- Created RaspberryPiSimulatorPage.tsx with SEO content and FAQ section.
- Each page includes structured data for better search engine visibility.
fix: improve session ID handling in Esp32Bridge and update WebSocket close logging
chore: mark subprojects as dirty in QEMU, RP2040, and Wokwi elements libraries
- Implemented ArduinoMegaSimulatorPage with detailed specifications, FAQs, and JSON-LD for SEO.
- Created ArduinoSimulatorPage featuring interactive components and a comprehensive FAQ section.
- Developed AtmegaSimulatorPage to simulate ATmega328P with full AVR8 emulation and included relevant FAQs.
- Introduced shared SEOPage.css for consistent styling across all simulator pages.
- Added useSEO utility for managing SEO metadata dynamically across pages.
- Created arduino-nano.svg with detailed PCB, MCU, pins, and components.
- Created arduino-uno.svg with comprehensive design including USB connector, power jack, and pin headers.
David Montero Crespo