Arctic Tank Monitor — low-power nRF9160 LTE-M sensor node for -40°C tank monitoring. Battery powered from a 3.6 V Li-SOCl2 cell, with TMP117 ambient sensing, external I2C ultrasonic sensor interface, nano-SIM, U.FL LTE antenna, and SWD programming.

Outdoor gate-interface controller accepting 12–24 V AC/DC, with Wi‑Fi, plug-in LTE‑M/NB‑IoT backup, two isolated OPEN/CLOSE relay outputs, and two isolated gate-position inputs.

ESP32-based cellular IoT board using a Telit Cinterion TX62-W LTE-M/NB-IoT modem with integrated eSIM/eUICC support, UART host control, and dedicated power/RF design blocks.