CO₂ Sensing¶
Purpose¶
Plants consume CO₂ during photosynthesis. In a sealed grow space, CO₂ can become depleted below ambient (~420 ppm), limiting growth. Monitoring CO₂ allows the exhaust fan to introduce fresh air when levels drop.
Hardware¶
- Sensor: TBD (e.g. MH-Z19B NDIR, Sensirion SCD30)
- Interface: TBD (UART / I²C)
- Placement: at canopy level; away from direct airflow to avoid dilution artifacts
Integration¶
- Polling interval: TBD
- Target range: TBD (ambient ~420 ppm; enriched grows may target 800–1200 ppm)
- Low CO₂ triggers Air Regulation actor (fresh air exhaust cycle)
Notes¶
- NDIR sensors (MH-Z19B) require periodic auto-calibration to outdoor air or manual baseline correction.
- CO₂ enrichment (injection) is a future direction — not in current scope.