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The public has become more conscious of the importance of food quality and its effects on the human health. Consuming the expired food may lead to serious health problems, thus, a food freshness real-time monitoring system that is safe, inexpensive, and highly accurate is needed to ensure that customers can choose food packages with the best quality. In this paper, we demonstrate a method to monitor...
This paper proposes an optimal energy harvester (OEH) that uses a flexible photovoltaic (FPV) module to prolong battery life for a wearable body sensor node under indoor and outdoor conditions. The proposed sensor node uses a Bluetooth low-energy module, which consumes low power to wirelessly communicate with mobile devices for monitoring vital signals. A 19 cm $\times4$ cm FPV module that can easily...
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