Entropy comes from FPGA ring oscillators whose sampled timing jitter is XOR-combined into output bits, with no pseudo-random post-processing. A SAMD21 serves the results over USB, over HTTP on its own WiFi access point (stationary mode, on a charger), or over Bluetooth LE (mobile mode, on battery).
- 4 independent generators × 90 ring oscillators. Each generator XORs its rings every 120 MHz clock (spatial) and then several consecutive bits (temporal, default 5): about 24 Mbps per generator.
- Separate stream per generator, plus a combined stream of all healthy generators
- On-device health tests per generator: NIST SP 800-90B repetition count and adaptive proportion, plus a dead-ring monitor
- Live statistics per trial: bias, z-score, random walk and lag-1 autocorrelation, with rolling and cumulative windows
- Configurable random-walk / majority-vote bias amplifier on a bias path and an autocorrelation path, with sub-trial voting
- Von Neumann extractor that can be toggled on the stream, statistics and amplifier paths
- Per-second trials in Global Consciousness Project format (200-bit XOR-masked sums per generator, plus full-rate sums), with Stouffer Z and network variance
`tools/strix.py` talks to the device over USB; run it with `devbox run strix <command>` or `uv run tools/strix.py <command>`. It finds the board by its USB ID (override with `--port` or `STRIX_PORT`).
`gcp` prints one line per second: UTC time, second number, the four 200-bit sums, Stouffer Z, Z², and the cumulative Z² − 1 with its p = 0.05 envelope (`*` when outside). `--full` tracks the full-rate trials instead. It reconnects after USB dropouts and fills missed seconds from the device's 60-second history. `--log` appends GCP-style CSV rows, `13,<unix time>,<UTC date-time>,<g0>,<g1>,<g2>,<g3>` (empty for unhealthy generators), after a `12,gmtime,Date/Time,g0,g1,g2,g3` header.
