Environment: temperature, humidity and VPD

The ENVIRONMENT card is the tent's thermometer. It shows what the main sensor reports, the trend over the last few hours, and the climate equipment that depends on it.

The card's three faces

• With the sensor reporting: numbers, chart and equipment.
• Sensor assigned but no data yet: "waiting for first reading" along with the device name. If it stays like that for a long while, the problem is the connection, not the app.
• No sensor: the whole card is a button that takes you to assign one.

The three buttons in the header

🔔 Bell

Alarm history for this zone: what fired, when, and with what value.

🕐 Clock

Environment history: charts per metric, a range you pick and CSV download.

⚙ Gear

Everything on one screen: environment targets per stage, alert thresholds, sensor calibration and what each piece of equipment does.

VPD, in one line

• VPD combines temperature and humidity into a single number: how thirsty for water the air is. That is the one to watch, not humidity on its own.
• The app calculates air VPD and leaf VPD. The leaf one assumes the leaf is cooler than the air (2 °C less, by default) and it is the one that reflects what the plant feels.
• Each stage has its target band in kPa. Inside the band it goes green; outside it goes amber and tells you what to correct ("raise humidity", "lower temperature").

• These are the targets the app proposes if you have not picked a protocol. At night it drops about 3 °C and raises humidity: you can set a night offset of 1 to 6 °C with a single control, or edit the night values one by one in advanced mode.
• The VPD bands per stage are 0.4–0.8 kPa in clones, 0.8–1.2 in veg, 1.1–1.5 in flower and 1.3–1.6 in late flower. The leaf band shown is the air band minus 0.3 kPa.
• The leaf temperature offset is 2 °C by default (the leaf is cooler than the air) and you can move it between 0 and 10. You can ask for it not to be applied at night, when the leaf no longer transpires the same way.

Calibrating a sensor

• We do not ask you for an "offset": we ask you for the number your reference instrument reads. The app works out the difference on its own, and always against the raw reading — so calibrating twice does not subtract twice.
• The correction lands right away on the current value, on everything that arrives afterward, and backward through the history.
• Maximum ±10 °C and ±30 % humidity. More than that is not a miscalibrated sensor: it is a broken sensor or a typo.
• An empty field means "I am not measuring this metric right now", not "set it to zero". To remove a calibration there is the delete button.
• You cannot calibrate a frozen sensor, or one whose reading is more than 15 minutes old: you would be calibrating against a dead number.