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.

Production-defensible Rev B ear tag tracker using nRF9151 with separate LTE and GNSS antennas, solar-assisted LiPo charging, battery protection, SPI NOR flash, NFC, eSIM, I2C sensors, Tag-Connect SWD, grouped EVT test points, and RF/power zoning on a 40 mm x 24 mm 4-layer PCB.