🌡️
VPD climate control
Temperature and humidity driven by VPD targets per growth phase. Separate day/night offsets. EMA smoothing eliminates sensor noise.
v1.0 — Stable release
Your growbox, on autopilot.
VPD-driven climate automation for Home Assistant. One-time purchase, no subscription. 18 automations, 8 safety layers, emergency stop.
No subscription
One-time €39 / €79
HA packages install
Runs locally on HA
Built for growers who want control, not guesswork
Not a basic thermostat. A structured climate controller with VPD targeting, phase-aware logic, and safety systems that protect your grow 24/7.
🧠
Climate Brain
Central decision engine running every 60s. Priority cascade: safety → VPD → temperature. Thermal fighting guard prevents heater vs fan conflicts.
🛑
Emergency stop
One button kills all devices instantly. Heater, fan, humidifier, light — everything OFF. Push notification to your phone.
📊
System health
Single health sensor: OK, WARNING, or ERROR at a glance. Aggregates alarms, sensor status, and mapping validation.
🌱
Automatic phases
Seedling → Vegetative → Flowering transitions happen automatically. VPD and temperature targets adapt per phase, day and night.
🧮
VPD calculator
Built-in "what-if" simulator. Slide temperature and humidity to preview VPD before changing your setup.
How SmartGrowLab works
A continuous feedback loop: sensors measure → logic decides → devices act → climate changes → sensors measure again.
8 layers of protection
Your grow runs unattended. Safety isn't a feature — it's the foundation.
🛑 Emergency stop
All devices OFF instantly, one toggle.
🔥 Heater watchdog
Auto-cutoff after 20 min continuous.
💨 Fan watchdog
Auto-cutoff after 30 min continuous.
💧 Humidifier watchdog
Auto-cutoff after 15 min continuous.
📡 Sensor drift
Alerts when sensors disagree (temp + humidity).
🔄 Restart recovery
Safe state after HA restart. Devices OFF, timers reset.
✅ Mapping validation
Blocks automation if entity IDs are wrong.
🏥 System watchdog
Monitors Climate Brain. Alerts if it stops.
What happens when things go wrong?
Every grow has bad days. SmartGrowLab is designed to handle them automatically.
📡 Sensor fails mid-grow
Detected within 30 seconds. Fan switches to fail-safe mode (ON). Push notification to your phone. System continues with remaining sensor.
🔌 Home Assistant restarts
All devices go OFF immediately. Timers reset. System waits 60 seconds for sensors to stabilize, then resumes normal operation automatically.
📶 Router or WiFi goes down
SmartGrowLab runs locally on Home Assistant — no cloud required. However, if your devices rely on cloud connectivity (e.g. Tuya cloud plugs), HA cannot control them without internet. We recommend local-only devices: Shelly, Tasmota, ESPHome, Zigbee — they work without internet or cloud.
🔥 Heater runs too long
Watchdog cuts power after 20 minutes. Locks automation to manual mode. Auto-recovery kicks in when temperature returns to safe range.
Fraction of the cost, same level of control
Dedicated grow controllers cost €200–500+ and lock you into proprietary ecosystems. SmartGrowLab runs on hardware you already own.
DIY HA blueprints
Free
- Basic on/off only
- No VPD logic
- No safety systems
- No watchdogs
- No restart recovery
- Free
SmartGrowLab Full
€79
- VPD control + 3 phases
- Dashboard in HA
- Open ecosystem (any sensor)
- 8 safety layers
- Emergency stop
- No subscription, ever
Dedicated controllers
€200–500
- VPD control
- Built-in display
- Closed ecosystem
- Proprietary sensors
- No HA integration
- Monthly cloud fees
See it running on a real grow
Time-lapses, dashboard walkthroughs, and automation demos on the SmartGrowLab YouTube channel.
Subscribe to @SmartGrowLab ↗ — time-lapses, dashboard previews, and setup walkthroughs.
One-time purchase. No subscription. Ever.
Basic if you're comfortable with YAML. Full if you want the dashboard and zero file editing.
Basic
€39 one-time
The automation core. Edit one mapping file (8 lines), the rest works out of the box.
- 18 automations (Climate Brain, watchdogs, safety)
- VPD targeting with phase-aware logic
- Emergency stop
- Sensor drift detection (temp + humidity)
- Installation guide (PDF)
- Testing procedure (PDF)
- VPD reference chart (PDF)
Full
€79 one-time
Everything in Basic plus the dashboard. Configure through UI, no YAML editing.
- Everything in Basic
- 3-view Lovelace dashboard (Setup, Control, Settings)
- UI-based device mapping — zero YAML editing
- System health indicator (OK / WARNING / ERROR)
- VPD what-if calculator with gauge
- 24h temperature and VPD history graphs
- Live device reason display
Install as HA Packages — copy a folder, add 3 lines to configuration.yaml, restart. 5 minutes.
What you need
FAQ
Is this a physical controller?
No. SmartGrowLab is a digital product — YAML files that run on your Home Assistant. You use your own sensors and smart plugs.
What if a sensor fails?
Detected within 30 seconds. Fan switches to fail-safe (ON), push notification sent. System continues with remaining sensor.
Does it need internet to run?
SmartGrowLab itself runs locally on Home Assistant. But your devices matter: local devices (Shelly, Tasmota, ESPHome, Zigbee) work without internet. Cloud-dependent devices (Tuya cloud, some WiFi plugs) will lose control if internet goes down. We strongly recommend local-only hardware.
Can I use just one sensor?
Yes. Enter the same entity ID in both fields. You lose drift detection, but everything else works normally.
Does it work with Zigbee / Shelly / ESPHome?
Yes. Any sensor or switch that appears as an entity in Home Assistant works with SmartGrowLab.
Basic vs Full — what's the real difference?
Basic: you edit one YAML file (8 lines). Full: you configure everything through the dashboard UI — zero YAML editing, plus graphs, health indicator, and VPD calculator.
Can I install on an active grow?
Yes. The testing procedure is designed for live grows — install, monitor passively for 1–24 hours, then activate. Full rollback at any point.
What happens during a Home Assistant restart?
All devices go OFF safely. Timers reset. System waits 60 seconds for sensors to stabilize, then resumes automatically.
Is support included?
This is a one-time purchase with comprehensive PDF guides (installation + testing + VPD chart). Support may be provided on a best-effort basis.
Stop babysitting your growbox.
Let SmartGrowLab handle VPD, temperature, humidity, and safety — while you focus on what matters.