Affordable energy autonomous wireless sensor for day and night

Meli, Marcel; Hegetschweiler, Lukas

doi:10.21256/zhaw-2001

2016

DOI: 10.21256/zhaw-2001

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Affordable energy autonomous wireless sensor for day and night

Marcel Meli¹,

Lukas Hegetschweiler²

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2023

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“…This is the method used in most systems. The authors of [12] provide one of the many examples that work in that way. The sophistication is partly related to characteristics such as the discharge current, the number of charge/discharge cycles, and the operational temperatures.…”

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confidence: 99%

Energy Autonomous Wireless Sensing Node Working at 5 Lux from a 4 cm2 Solar Cell

Meli

Favre

Maij

et al. 2023

JLPEA

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Harvesting energy for IoT nodes in places that are permanently poorly lit is important, as many such places exist in buildings and other locations. The need for energy-autonomous devices working in such environments has so far received little attention. This work reports the design and test results of an energy-autonomous sensor node powered solely by solar cells. The system can cold-start and run in low light conditions (in this case 20 lux and below, using white LEDs as light sources). Four solar cells of 1 cm2 each are used, yielding a total active surface of 4 cm2. The system includes a capacitive sensor that acts as a touch detector, a crystal-accurate real-time clock (RTC), and a Cortex-M3-compatible microcontroller integrating a Bluetooth Low Energy radio (BLE) and the necessary stack for communication. A capacitor of 100 μF is used as energy storage. A low-power comparator monitors the level of the energy storage and powers up the system. The combination of the RTC and touch sensor enables the MCU load to be powered up periodically or using an asynchronous user touch activity. First tests have shown that the system can perform the basic work of cold-starting, sensing, and transmitting frames at +0 dBm, at illuminances as low as 5 lux. Harvesting starts earlier, meaning that the potential for full function below 5 lux is present. The system has also been tested with other light sources. The comparator is a test chip developed for energy harvesting. Other elements are off-the-shelf components. The use of commercially available devices, the reduced number of parts, and the absence of complex storage elements enable a small node to be built in the future, for use in constantly or intermittently poorly lit places.

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mentioning

confidence: 99%

Energy Autonomous Wireless Sensing Node Working at 5 Lux from a 4 cm2 Solar Cell

Meli

Favre

Maij

et al. 2023

JLPEA

View full text Add to dashboard Cite

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Affordable energy autonomous wireless sensor for day and night

Cited by 1 publication

References 0 publications

Energy Autonomous Wireless Sensing Node Working at 5 Lux from a 4 cm2 Solar Cell

Energy Autonomous Wireless Sensing Node Working at 5 Lux from a 4 cm2 Solar Cell

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