OpenCollar ACC Calculator

Static React + TypeScript + Vite web app for simulating an nRF52 + LIS2DW12 motion summary pipeline:

• LIS2DW12 sampling and FIFO wake behavior
• nRF52 active/sleep duty-cycle model
• Optional flash write/erase amortized current model
• Payload field builder with byte layout preview
• Runtime and storage projection outputs

Why this exists

This tool helps estimate tradeoffs between motion fidelity and power budget before firmware implementation.

Assumptions and defaults

• Default battery preset: 1x Saft LS14250 (1.2 Ah, 3.6 V)
• Flash storage options: 128 megabit (16 MiB) or 256 megabit (32 MiB)
• nRF52 defaults: sleep 1.5 uA, active 4.0 mA, FIFO service 2 ms, finalize 10 ms
• LIS2DW12 current model defaults to LP1 + low-noise-off anchor table with linear interpolation:
  • 1.6 Hz: 0.38 uA
  • 12.5 Hz: 1.0 uA
  • 25 Hz: 1.5 uA
  • 50 Hz: 3.0 uA
  • 100 Hz: 5.0 uA
• FIFO depth fixed at 32 samples
• Report interval default 300 s

Where formulas live

• Power and runtime formulas: src/calcs/power.ts
• Flash/storage formulas: src/calcs/storage.ts
• Payload field definitions, byte sizing, and preview encoding: src/calcs/payload.ts

Development

npm ci
npm run dev

Run tests:

npm test

Build production bundle:

npm run build
npm run preview

GitHub Pages

The repo is configured for GitHub Pages deployment using .github/workflows/deploy.yml.

• Build: npm ci && npm run build
• Publish: dist/ via actions/deploy-pages
• Vite base path: /opencollar-acc-calculator/

Shareable configs

• Copy configuration copies full JSON config.
• Share link writes a URL hash (#cfg=<base64-json>) for reproducible state.