Abstract In this paper we show that RF transmissions using the physical layer of “Long Range” (LoRa ® ) interface, and with some limitations also data link network Long Range Wide Area Network (LoRaWAN), are suitable even for extremely power-restricted devices, like energy-autonomous wireless sensor nodes (WSNs), if configured well. We analyse most critical parameters their influence on power performance. This includes outer circuitry, software configuration transmitter SX1276 new SX1262....

We propose a novel approach to measure photosynthetically active radiation (PAR ) in the form of photosynthetic photon flux density with an inexpensive, small multi-channel spectrometer sensor, integrated optical filters and analog-to-digital converter. Our experiments prove that combination eight spectral channels different sensitivities, such as sensorchip use (AS7341, ams), derive PAR accuracy 14/m2/s. Enabled by sensor architecture, additional information about light quality can be...

In this paper, we describe a novel animal-tracking-system, solely powered by thermal energy harvesting. The tracker achieves an outstanding 100 μW of electrical power harvested over area only 2 times 20.5cm2, using the temperature difference between animal's fur and environment, with total weight 286 g. steps to enhance income are presented validated in field-test, system that fulfills common tracking-tasks, including GPS fix every 1.1 h 1.5 h, activity measurements, all data wirelessly...

In this paper we will first present the measurement of temperatures on different positions at a diesel-powered car. As result, several locations are identified as suitable to implement wireless sensor node powered by thermal energy harvesting. Based data gained thermoelectric generator (TEG) has been selected, and measurements generation have performed. Further, complete energy-autonomous was designed, including TEG with its mounting bracket, an electronic power management, Bluetooth Low...

In this paper, we present the design, set-up and testing of a fully energy-autonomous wildlife tracking collar that is supplied by thermoelectric energy harvesting from animal's body heat. Attached to neck mammal, device determines activity, body-temperature its own state. The data then transmitted in regular short beacons which are also used for triangulation animal position. characterization laboratory field test show system design with an ultra-low power switch low-voltage...

This paper focuses on the design of an optimized thermal interface for a thermoelectric energy harvesting system mounted at endothermic animals. In this application scenario mammal’s fur reduces heat flux from animal’s body through generator (TEG) to ambient air. requires adapted between TEG and surface, increase its conductivity without harming animal. For purpose is determined with specially designed heatsink. An analytical model built predict resulting resistances validated experimental...

This paper focuses on the design parameters of thermal connection for a thermoelectric energy harvesting system mounted onto endothermic animals. To best our knowledge, this is first time that conductivity through mammal's fur analyzed with specially designed heatsink. An analytical model built to predict resulting resistances and validated experimental results two different lengths. We show an optimized interface reduces its resistance up 38% compared trivial while lowering weight about...