v2.8.0 - VOC Index Support & PM4/NOx Sensors

New Features

• tVOC VOC Index support — Sensirion-based sensors (Ikea VINDSTYRKA, Grove SEN55, etc.) that use the VOC Index scale (0–500, baseline 100) are now correctly interpreted. Previously these were compared against absolute ppb thresholds, causing misleading status labels. The card auto-detects the sensor type from unit_of_measurement, or you can set tvoc_unit manually in the config editor. Fixes #17.

• PM4 and NOx sensors — New pm4_entity and nox_entity config options for Grove SEN55 and similar multi-sensor devices. Each gets its own graph, color thresholds, and status labels. Closes #14.

Configuration

New options in the editor's Advanced section:

• tVOC Measurement Type — Auto-detect (default), Absolute (ppb), or VOC Index (Sensirion)

New entity fields in Additional Sensors:

• PM4 Sensor — Particulate matter ≤4μm (μg/m³)
• NOx Sensor — Nitrogen oxides (ppb)

Full Changelog

v2.7.1...v2.8.0