Settings › Climate

Fan airflow corrections, targets (4×8, 2×4), stage presets, heat warning, 2×4 climate mode, 2×4 schedule source, control strategy, priority tent, pressure regime, humidifier routing, dry and cure alert bands, and the advanced hub rows (hysteresis, min-off, ladder waits, de-strat, mister). The Climate desk named on this page opens from a space page.

Most rows on this page are Hub scope: the brain holds the desired value and applies it to the hub, showing SYNCED / PENDING / HELD / HUB DIFFERS. What those scopes and badges mean is in how the settings pages work.

Fan airflow correction per fan (4×8 intake, 2×4 intake, room exhaust, outside exhaust): a scale applied to the fan's nameplate or learned CFM so the air path reads true. For why airflow matters, see grow room ventilation. Set it from an anemometer reading when you cannot run a full Learning session. Brain scope.

• Temperature, RH and VPD targets for the 4×8 (target_temp, rh_target_min/max, vpd_target_min/max) and the 2×4 (clone_target_temp, clone_rh_min/max, clone_vpd_min/max). The desks edit the same rows; this page is the reference with defaults and change history. The hub takes 4×8 targets only while it is in its Custom stage. In a named stage the brain does not send a 4×8 target at all: the row reads Not sent: the hub is in <stage> stage; it only accepts 4×8 targets in Custom. When the 2×4 is in Follow plants mode its rows are brain-owned and read-only here.
• VPD in-band target (on the Control card, default 18 h): hours per day the hub aims to keep VPD inside the band before it counts the day as missed; feeds the VPD chart's time-in-zone.

The stage rail: Germination through Final 48-72h Flowering, Dry Mode, and the two cooler dry rows Balanced dry (17 °C) and Slow dry (15.5 °C) that a Dry zone's dry strategy picks. Each row holds temperature, VPD min/max, RH min/max and light hours; light hours are labels, the hub's photoperiod rail decides them. Reset all to firmware table undoes your edits. Writing a stage to the hub is done on the 4×8 tent cockpit (Climate › Tent), in its Want section under Apply a stage's Want now. Pick a stage and Apply now asks first (Write Want) and lists what it will write: the 4×8's temperature, VPD and RH targets and its temperature band (the setpoint ±1.5 °C, which the temperature alert reads). The hub takes 4×8 targets only while it is in its Custom stage. With the brain owning the presets and the hub in a named stage, Apply now is not pressable and the line under it reads, for example, Nothing will be sent: the hub is in Flowering stage and only accepts 4×8 targets in Custom. The 4×8 fans keep following the targets the hub last accepted, an earlier stage's. With the Brain owns stage presets switch off, the line reads The hub applies its baked table for each stage (Brain owns the stage Want is off), so the brain writes no stage Want.. The Brain owns stage presets switch decides who writes targets on a stage change. A new kit ships with it off. With it on and the brain connected, the brain writes this table and the ±1.5 °C band; off, or with no brain, the hub's baked table writes them — the same numbers, with a band of setpoint to setpoint + 3 °C. A line under the table says which case you are in: brain owns the stage Want — stage changes stamp this table when the brain owns the presets, or hub applies its baked table — this table labels the desks only when it does not. With the brain owning the presets but the hub in a named stage, a note adds that the hub is in that stage and only accepts 4×8 targets in Custom, so the brain does not send its stamps there. To see a VPD range as temperature and humidity pairs, use the VPD chart by growth stage.

• Heat warning (canopy): a picker of temperatures the brain offers. The row reads Warns when the canopy reaches the value you picked, and says the hub's 35 °C purge stays the last resort. Until you set one, the row shows the value the brain uses. A pick counts as saved only when the brain reads it back.
• 2×4 climate mode: decides what temperature and humidity the 2×4 aims for. Follow 4×8 mirrors the main tent's targets; Follow Plants intersects the 2×4 plants' Want (the Pi writes it about every 12 h); Custom leaves the sliders alone; Off parks the 2×4. The 2×4 tent cockpit on the Climate desk shows it as a read-only line with a Change in Settings button.
• 2×4 schedule source: decides when the 2×4 lamp is on: its own window (Independent) or the 4×8's clock (Follow 4x8). Separate from the climate mode. The Light desk shows it as a read-only line with a link to this row.
• Control strategy: the hub's ladder strategy select.
• Priority tent: which tent wins the shared exhaust.
• Humidifier intake routing: whether humidifier output rides the intake path. The Climate desk prints this as a read-only line called Humidifier air routing.
• Stage and manual holds (on the Targets card): a link to the Climate desk. The active stage and the manual overrides are live controls there, not settings. The 2×4 climate mode and schedule source are in Control, below.

Two hub rows, 4×8 pressure · intake budget (default 70 %) and 2×4 pressure · intake scale (default 100 %), and What this asks for, which reads each tent as negative (below 97 %), neutral or positive (above 103 %); the 2×4 is an estimate. Positive pressure bypasses the carbon filter. The brain reports a pressure target and net flow per tent on Climate.

Dry and cure (Brain scope): watched, never controlled. A zone flipped to Dry shows its dry run on the Climate desk; a zone flipped to Cure (a curing chamber with a Zigbee puck in each jar) shows every jar on its own.

Changing an advanced row changes how the hub keeps the room safe. Change one at a time and watch the ladder for a day.

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DSC-Brain user guide · Settings › Climate · this page is edited on the site; the Notion original was retired after the mirror