Ulva

An open-source ESP32-C5 controller board for robotics and controlled-environment agriculture (CEA).

The repository contains a 100 × 100 mm, two-layer carrier PCB, eight KiCad schematic sheets, project libraries and an ESP-IDF button-input example. The current board revision is v0.42.

• Two CAN FD interfaces with fused 24 V control-power outputs.
• 24 V DC input and an onboard 5 V supply.
• Two I²C buses, peripheral connections and OpenSprinkler-compatible AC/DC expansion.
• OLED, RTC, DHT20, 433 MHz receiver and passive piezo connections.
• Three ADC buttons, a two-switch configuration input and voltage monitoring.

This is a prototype. Full controller firmware and physical validation remain unfinished. See the hardware reference for pin assignments, power limits and wiring.

Board views

CAD renders of the current board:

Front	Back
Routing	3D assembly

Interactive board viewer · HTML source

Switch between the Routing, 3D, Schematic and Orders tabs. Routing lets you select traces, vias or pads to highlight a net, search components, switch copper layers, zoom and save a selection image. Ground pours are omitted; both layers use front-view coordinates. Schematic provides a thumbnail sidebar for all eight sheets, with zoom, pan and a PDF download. Orders lets you select JLCPCB assembly or loose LCSC parts and download supplier files; see the order workflow.

For offline use, keep the complete docs/ directory and open docs/index.html directly in a browser. In Routing, choose routing/board.svg when prompted. In 3D, choose 3d/assembly.json and 3d/board.glb together. A local server is optional; the browser needs explicit file selection to read these data files from disk. Schematic images, the PDF and Orders open directly without a file picker.

Version details shows the board revision, an Export base commit and source/export SHA-256 hashes. Export base records Git HEAD when the metadata was generated. Each view retains its own recorded source hashes, so older exports can be distinguished from the current sources.

3D assembly

Open the 3D tab · Export and usage guide

Rotate, zoom and pan the assembly, or show and hide individual components and modules. Visibility controls affect the view only. Some component shapes and module mounting heights are illustrative; the KiCad board remains authoritative.

Open the project

Open ulva_controller.kicad_pro in KiCad 9 with its standard symbol and footprint libraries installed. The included project libraries use relative paths.

Path	Contents
ulva_*.kicad_*	Schematics, PCB, project settings and design rules
Ulva.kicad_sym, Ulva.pretty/	Project symbols and footprints
Ulva.3dshapes/	Original terminal-block visualization models
docs/hardware.md	Hardware and pinout reference
docs/bom.md	Parts and assembly ownership
docs/3d.md	3D viewer, export and model limitations
tools/	JLCPCB and LCSC order preparation and unit tests
scripts/	KiCad DRC/ERC validation, SPICE simulation and export runner
firmware/buttons_adc/	Button example, host unit tests, build and integration instructions
artwork/ulva-icon.svg	Board icon

Verification

Use Python 3.10 or later. Button tests need CMake and a C compiler. CAD checks use KiCad 9's kicad-cli and pcbnew module in the same Python environment, plus ngspice for analog checks. Without native KiCad, the runner uses Docker with the pinned kicad/kicad:9.0.9 image.

From the repository root, install the rendering dependencies needed for PCB, Gerber and board-documentation checks, then run the relevant checks:

python3 -m pip install --target build/preview-python \
  gerbonara==1.5.0 resvg-py==0.2.6
python3 -m unittest discover -s tools
python3 scripts/run_checks.py buttons
python3 scripts/run_checks.py schematic
python3 scripts/run_checks.py pcb

The runner checks a disposable snapshot and writes logs and receipts under ignored build/runs/. Use the runner rather than invoking its export helpers directly. Automated checks do not replace physical hardware validation.

When board images or the routing viewer need regeneration:

python3 scripts/run_checks.py board-docs
# After reviewing the generated assets, update the images and routing viewer:
python3 scripts/run_checks.py board-docs --update-docs

To regenerate the schematic pages and PDF, use Python 3.10 or later and KiCad 9's kicad-cli. Review the output in build/schematic-docs/, then publish it:

python3 scripts/export_schematic_docs.py
python3 scripts/export_schematic_docs.py --update-docs

After updating public viewer assets, refresh their version metadata. This reads the existing files; regenerate any affected view first:

python3 scripts/export_viewer_info.py

License

Original Ulva design files, firmware, documentation and artwork are released under the MIT License. Upstream library data and dependencies retain their own licenses; see third-party notices.