A solar-powered environmental sentinel buried at root depth — measuring temperature, humidity, soil resistance, and battery state over a LoRa 915 MHz network.
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Sensirion SHT45 behind a sintered stainless mesh. One chip captures both ambient temperature (±0.1 °C) and relative humidity (±1.5 % RH) at deployment depth over I²C.
Two gypsum matrix sensor probes thread out through a PG7 cable gland and are buried at different depths. Resistance shifts with soil-water content — inferring matric potential.
An on-board ADC monitors supply voltage each cycle. A Voltaic solar panel continuously recharges the battery. When voltage drops below threshold the MCU shifts to deep-sleep to extend field life.
SMA-mounted 915 MHz antenna links the node to a LoRa / LoRaWAN network. Kilometre-scale range at milliwatt transmit power — essential for sparse deployment across remote forest plots.
Built around a 1-1/4" Cantex conduit body sealed with a foam gasket. IP-rated protection at commodity cost — designed to survive freeze-thaw cycles buried in forest soil.