Recording & Replay

Record


pieeg-server record session.csv                    # standalone, Ctrl-C to stop
pieeg-server record session.csv --duration 300     # 5 minutes
pieeg-server --record session.csv                  # record while streaming

You can also start/stop recording from the dashboard or via the WebSocket API:


{"cmd": "start_record"}
{"cmd": "stop_record"}

File Format

CSV with header: timestamp, ch1, ch2, ..., chN

Detail	Value
Format	CSV: `timestamp, ch1, ch2, ..., chN`
Location	`recordings/pieeg_YYYYMMDD_HHMMSS.csv`
Sample rate	250 rows/second
Annotation	Frame-based text markers; sidecar `.annotations.json`

Playback

The dashboard session library provides full playback controls:

Play/pause and seek via frame slider
Speed control: 0.25×, 0.5×, 1×, 2×, 4×
Time window: 2s / 4s / 8s display window
Y scale: ±50, ±100, ±200, ±500 µV
Annotations: Add/view text markers on any frame

Export

Format	Content
CSV	Raw data with annotation column
JSON	Session metadata + annotations

Recordings are stored locally on the Raspberry Pi. Download individual sessions from the dashboard’s session library.