Ultra Low Power Sensor Readout and Data Logger
For a battery-less system
A. Reunis (TU Delft - Electrical Engineering, Mathematics and Computer Science)
K. de Wit (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Kofi A.A. Makinwa – Mentor (TU Delft - Microelectronics)
Sijun Du – Mentor (TU Delft - Electronic Instrumentation)
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Abstract
Cold-chain
logistics demand precise temperature monitoring to ensure the safety and
quality of perishable goods during transport. Conventional solutions rely on
battery-powered temperature loggers, which contribute significantly to
electronic waste due to limited reusability. This thesis addresses this environmental
concern by contributing to the development of a fully batteryless, wireless
temperature logger designed for long-duration cold-chain monitoring. Focusing
on the sensing and data logging subsystem, this work presents the design and
implementation of an ultra-low-power system capable of accurate temperature
readout and multi-week data storage under strict energy constraints. The system
integrates a microwatt-level temperature sensor, a power-optimized
microcontroller, and energyefficient logging strategies to balance measurement
accuracy, memory use, and power consumption. The final implementation is shown
to have an idle power draw of <1μW and an energy use of 14μJ over the
measurement and storage period, with a peak power of 411μW . The temperature
measurements were found to be accurate within ±0.5°C . This accuracy and energy
efficiency, demonstrates its potential as a sustainable alternative to
traditional battery-powered loggers