Temperature 🌡️
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Air temperature measured by the sensor inside the ALU box — not the outdoor temperature. In direct sun the inside gets considerably warmer than the surrounding air; that difference is exactly what this box is here to measure.
Humidity 💧
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Relative humidity — how close the air is to holding all the moisture it can at its current temperature. 100 % does not mean water in the box; it means the air is saturated and condensation can start forming. Warm air holds more moisture, so the same amount of water shows a lower % when it is warm and a higher % when it cools down — which is why humidity rises at night even though nothing got wetter.
Pressure 🧭
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Barometric pressure at the box, in hectopascals. It follows the weather and the altitude of the site, so it reads lower than the “sea level” figure in a weather forecast. Around 1013 hPa is standard at sea level.
Battery 🔋
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Supply voltage of the device. A full Li-Ion cell sits near 4.2 V and is close to empty around 3.4 V. It is measured while the modem is transmitting, so it reads slightly lower than the resting voltage.
Signal 📡
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LTE-M reception strength in dBm. The value is negative and closer to zero is better: above −100 excellent, −100 to −110 good, −110 to −120 weak, below −120 marginal. Weak signal makes the modem transmit longer and use more battery.
Last upload ⏱️
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How long ago the device last sent data. It samples continuously and uploads in batches roughly once an hour, so a value of tens of minutes is normal, not a fault. Nothing is lost in between — readings are stored in flash and sent with the next batch.
Temperature
▾Humidity
▾Pressure
▾Daily history
▾
Custom IoT solution designed and built by
⚡IT & VoltCode