Battery-free wireless moisture sensor system for fruit monitoring

Fruit quality monitoring has been more and more important. This paper aims to propose and develop a battery-free wireless moisture sensor system for fruit monitoring (BWMS). The BWMS is made up of the battery-free moisture sensor tag and the near filed communication (NFC) reader. The battery-free moisture sensor tag includes the sensor acquisition module and NFC module. The storage temperature and weight sensor data of the fruit could acquire by the battery-free moisture sensor tag and wirelessly transmitted to the NFC reader by 13.56 MHz when receiving the data acquisition command from NFC reader. The BWMS could effectively monitor the MLR by acquiring the temperature and weighing sensor data with NFC, and predict the shelf-life of the fruit with in need by the shelf-life prediction model. All the data obtained by the BWMS was in real time monitored, stored, processed and finally displayed in the app of the NFC reader to improve the temperature, MLR and shelf-life transparency of the fruit, and finally ensure the quality and safety of fruit. The proposed BWMS has a potential application in many kinds of food monitoring by NFC and it could realize the shelf-life prediction for the simple and intuitive quality indicating of food.