nemi Log (+ cellular) is a stand-alone wireless data logger designed for reliable long-term and short-term measurement campaigns in mobile, rotating, and remote applications. Optimized for maximum battery life, it uses the highly efficient nemi Link 2400 radio technology to receive data from up to eight wireless sensor nodes within the nemi® ecosystem.

In addition to acting as a receiver, nemi Log is equipped with an integrated 9-DoF IMU (triaxial accelerometer, gyroscope, and magnetometer) and GNSS (GPS), allowing it to operate independently for measuring accelerations, rotation rates, rotation angles, magnetic fields, and position.

In the basic version, measurement data are stored locally on a microSD card, making nemi Log ideal for temporary offline measurements, test campaigns, and applications where no communication infrastructure is available. Thanks to its compact design and flexible mounting, it is particularly suitable for rotating and moving systems.

The nemi Log + cellular version extends these capabilities with cellular connectivity, enabling the transmission of status messages via MQTT and data upload to FTP servers using energy-efficient NB-IoT and LTE-M protocols. This allows a unique combination of high-rate measurements over medium periods and low-rate measurements over very long periods, making it especially valuable for construction monitoring, infrastructure monitoring, and remote condition monitoring.

All data are provided as timestamped CSV files using the integrated real-time clock (RTC). The device is housed in a robust, weatherproof IP65 enclosure and supports continuous operation via an external 7–30 V DC power supply.

The radio technology and system architecture are developed by i4M.