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Energy consumption estimation for TDMA-based industrial wireless sensor networks

Industrial wireless sensor networks make use of batteries to provide mobility and low maintenance. The available energy depends of battery specification, electrical characteristics of the device, communication protocol and process variable update rate. The development of industrial field devices and communication protocols demands solutions to verify the expended energy along the time which can be used to predict battery life and to provide a balanced network for messages routing. In this work, an energy measurement circuit is developed for TDMA-based industrial wireless field devices such as WirelessHART and ISA SP100.11 and it is used as a reference to correct an embedded energy estimation algorithm. The overall idea is to certify the algorithm embedded by the electronic measurement, further substituted by simple functions that calculate the expended energy. The results presented a 2.5% in most cases and 3.5% worst case errors by the estimation algorithm when compared to the reference circuit, used for measuring the total energy of the sensor node during a predefined communication period.