Engineering · TW-001
The complete first bench architecture—before anything is bought.
Current candidates, exact interface boundaries, a machine-readable profile, and explicit unknowns prepare the first physical connection without pretending hardware exists.
Reference data path
Optional sensors cannot bypass the authenticated client.
Official AC supply↓Raspberry Pi 5 / Linux↓Profile-enabled real adapters↓Durable queue → HTTPS → validation → Neon → device UI
Ethernet is primary and Wi-Fi fallback. GNSS, temperature, power monitoring, AIS receive, camera, battery, solar, cellular, and satellite remain disabled until real hardware and configuration exist.
Bench shortlist
Suitable for the next purchase decision—not installed.
COMPUTE
Raspberry Pi 5 4 GB
Raspberry Pi · USB / CSI / I2C / SPI / GPIO / Ethernet / Wi-Fi
$110.00 · In stock at current retailer when checked
POWER SOURCE
27 W USB-C Power Supply
Raspberry Pi · USB-C PD
$12.99 · In stock at current retailer when checked
GNSS
Mini GPS PA1010D
Adafruit · UART / I2C; USB through FTDI
$29.95 · In stock when checked
TEMPERATURE
Waterproof DS18B20 digital temperature sensor
Adafruit · 1-Wire
$9.95 · In stock when checked
POWER MONITOR
INA260 breakout
Adafruit / Texas Instruments · I2C 0x40 default
$9.95 · In stock when checked
AIS RECEIVE
dAISy 2+ dual-channel AIS receiver
Wegmatt · USB NMEA AIVDM / NMEA 0183
$119.00 · Current storefront
SERIAL USB
TTL-232R-5V-WE wire-ended cable
FTDI · USB 2.0 to 5 V UART
$23.80 · Available from manufacturer when checked
Digital-twin bridge
Every parameter declares its evidence class.
| Parameter | Planning value | Status | Measured | Basis |
|---|---|---|---|---|
| Battery capacity | 72 Wh | DATASHEET | NO MEASURED DATA AVAILABLE | Bioenno BLF-1206A candidate nameplateCandidate nominal capacity; usable capacity is not measured.Evidence ↗ |
| Solar unfolded area | 0.3718 m² | DATASHEET | NO MEASURED DATA AVAILABLE | Derived from Bioenno BSP-28 published unfolded dimensionsUnfolded physical area, not verified active-cell area.Evidence ↗ |
| Solar rated power | 28 W | DATASHEET | NO MEASURED DATA AVAILABLE | Bioenno BSP-28 ratingVendor nameplate output, not observed charging power.Evidence ↗ |
| Bench base load | 4 W | DATASHEET | NO MEASURED DATA AVAILABLE | Raspberry Pi typical bare-board currentBare-board typical value; storage, fan, peripherals, and conversion loss excluded.Evidence ↗ |
| Reference sensor load | 0.0941 W | DATASHEET | NO MEASURED DATA AVAILABLE | PA1010D tracking plus INA260 typical component valuesArithmetic sum of component values; INA260 source is recorded in the candidate registry; FTDI and wiring loss excluded.Evidence ↗ |
| Communications incremental load | UNKNOWN | ENGINEERING_ASSUMPTION | NO MEASURED DATA AVAILABLE | No separately attributable Ethernet/Wi-Fi measurement existsUNKNOWN until a physical bench measurement isolates the communications mode.Evidence ↗ |
| Battery planning reserve | 0.2 fraction | ENGINEERING_ASSUMPTION | NO MEASURED DATA AVAILABLE | Pelagio Defense pre-hardware planning policyRuntime reserve, not a hardware cutoff or measured capacity.Evidence ↗ |
| Solar orientation factor | 0.7 fraction | ENGINEERING_ASSUMPTION | NO MEASURED DATA AVAILABLE | Pelagio Defense concept modelPlaceholder planning derate pending geometry and field evidence.Evidence ↗ |
| Solar controller factor | 0.9 fraction | ENGINEERING_ASSUMPTION | NO MEASURED DATA AVAILABLE | Pelagio Defense concept modelPlanning derate, distinct from the candidate controller peak efficiency.Evidence ↗ |
| Controller peak efficiency | 0.98 fraction | DATASHEET | NO MEASURED DATA AVAILABLE | Victron SmartSolar MPPT 75/10 technical specificationsPublished peak, not an assumed all-day operating efficiency.Evidence ↗ |
| Provider solar input | UNKNOWN | EXTERNAL_PROVIDER | NO MEASURED DATA AVAILABLE | NASA POWER result selected at query timeNo fixed value; each result requires provider provenance and timestamp.Evidence ↗ |
Architecture + BOM
Functional blocks, first-connection minimum, current basket totals, and future water-test candidates are versioned in the repository.
Calibration + test
Real records can be attached after a physical device exists. Every gate starts not started and requires evidence.
Build + security
Non-root client, profile-controlled adapters, manual approved updates, checksums, rotation, and rollback—no remote shell.