Room Automation & Control
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Automating a grow room: measure, regulate, log
Automating a commercial grow room is not a matter of buying a controller: it is a complete chain, from probe to actuator, with a log that lets you explain afterwards what actually happened. Three building blocks make it up: climate regulation, fertigation and monitoring.
Three building blocks, in this order
Climate comes first: temperature, relative humidity, vapour pressure deficit, CO₂ and air exchange condition everything else. Irrigation and dosing follow, since they depend on the transpiration regime the climate establishes. Lighting is connected last, for ramps and load shedding. Monitoring sits alongside: it observes and records, it does not command.
What distinguishes professional control
- Number of zones and of inputs and outputs, and above all the output type: volt-free contact, 0-10 V, speed control. An unsuitable output means an extra relay and one more point of failure.
- Type of regulation: on/off with hysteresis, PID, cascade. Badly set hysteresis makes a compressor cycle; an anti-short-cycle delay is a prerequisite.
- Protocols and openness: Modbus RTU or TCP, MQTT, volt-free contacts, a programmable interface. Interoperability between brands is never assumed; it is verified before ordering.
- Degraded mode: behaviour on loss of a probe, on power restoration, on controller failure. Fallback setpoints and a remote alarm are worth more than one more feature.
- Logging: history depth, time stamping, an export usable outside the manufacturer's own software.
- Maintainability: probe calibration, spare parts, independence from a proprietary online service.
Three confusions to avoid
A controller does not replace a machine: it commands equipment that must be correctly sized in the first place. A logger controls nothing: measuring and regulating are two distinct functions, carried by two different devices. And relative humidity cannot be regulated independently of temperature: at constant absolute humidity it moves as soon as temperature does, which explains most of the setpoints that never seem to hold.
Where to go next
No references are listed on this page in their own right: control architectures are specified project by project, according to the number of zones and the equipment in place. The most developed block in the range is automatic nutrient solution dosing. Timers, thermostats and hygrostats are covered device by device in our guide to automation. For a non-professional space, our indoor growing home automation answers the same need at another scale. Back to the professional range.
