Existing System Inventory

Before building the Grow Assistant, a self-built Growlink-style Home Assistant dashboard was already in productive use. This chapter documents what it contained, so the migration in later phases (each module replaces one part of this system, see the phase plan) has a clear reference and so this knowledge is not lost.

Automations to be replaced (per phase)

Existing automation	Replaced in	Notes
RH Control VPD- (Clone/Transplant)	Phase 3	Phase-dependent VPD setpoints; informs the Grow Tracker phase coupling
RH Control VPD+ (Clone/Transplant)	Phase 3	See above
Growzelt Bewässerung - P1 / - P2	Phase 4	Two irrigation zones (matches the confirmed 1-2 zone scope)
Cannabis Bewässerung - Notabschaltung	Phase 4	Emergency irrigation shutoff
Failsafe Bewässerung - 35%	Phase 4	Hard substrate-moisture safety cutoff; blueprint for the Phase 4 failsafe logic
Growzelt Zeitschaltuhr - Licht An / Licht Aus	Phase 6	Simple light schedule
Growzelt - Undercanopy einschalten / ausschalten	Phase 6	Under-canopy light schedule
Blüten Trocknen	Phase 6	Special drying-phase light/climate profile, coupled to the Grow Tracker “Drying” phase

Migration rule (binding, see Phase 0 plan Section 5/7): each new module runs in shadow mode (observing only) until the 48-72h validation window passes. Only then is the corresponding old automation disabled. The old and new systems are never both actively controlling the same function at the same time.

UI patterns carried over into the new Dashboard 2 design

• Gauge tiles with a red/yellow/green band for VPD, Temperature and Relative Humidity.
• Multi-axis combo charts (VPD/Temp/RH overlaid on one chart; substrate moisture/pump-on-state overlaid on another).
• Horizontal per-switch daily on/off timeline bars.
• Separate energy gauges per device group (e.g. total consumption vs. lamp consumption specifically), not just one aggregate number.
• A “Grow Tracker” card showing the current flower day count, expected flower time, and the seedling/vegetation/flower start dates - rebuilt as the actual Grow Tracker module (M9) rather than a display-only widget.

Additional sensors found (not in the original Dashboard 1 spec)

A GW1200A-style weather station provided:

• Dewpoint
• Relative barometric pressure
• Absolute barometric pressure
• An additional soil moisture sensor

These are included as optional, informational-only tiles in Module M0 / Dashboard 1 - they do not feed into any control logic (e.g. VPD is still computed only from the mapped temperature/humidity sensors).