Research Article Testing an Arduino-Based Approach for Full-Duplex Voice Communication and Body-Parameter Sensing Electronics for Use with Smart Clothing Miroslav Joler , Andrej BerkariT, and Valentin Klen Faculty of Engineering, University of Rijeka, Rijeka HR-51000, Croatia Correspondence should be addressed to Miroslav Joler; mjoler@riteh.hr Received 27 December 2018; Revised 24 March 2019; Accepted 22 April 2019; Published 8 May 2019 Academic Editor: N. Nasimuddin Copyright © 2019 Miroslav Joler et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In this paper, we discuss the state of the art and trends in the feld of smart clothing development and show two circuits that we assembled in search for adequate solutions. Te circuits are based on Arduino concept and achieve a full-duplex voice communication and real-time publishing of temperature measurement to a designated web page. Te characteristics of the two circuits are discussed as well as the prospects for their future improvements. 1. Introduction Development of communication networks and microelec- tronics is bringing us opportunities to work towards devel- opment of smart clothing. Garment considered as smart clothing is envisioned to be equipped with various wireless sensors and communication capabilities towards remote entities. Sensors should enable either measurement of body parameters such as the heart rate [1, 2], blood pressure, glucose level [3, 4], or air quality [5] and wirelessly transmit the measured data to some main control unit (MCU) that is also being worn on a body or being outside it such as a mobile phone, which would then display them and/or store them, make further calculations using them, and alert the wearer and other interested parties about possibly concerning values of some body parameters, or forward them to a remote center, such as a cloud storage. Communication links should provide reliable and secure data transmission from the sensors to MCU in diverse environments and under diferent body motions and provide a range from a few tens of centimeters to several meters or tens of meters, depending on the scenario of the particular application. Te integration of the sensors and communication chips into the clothing should satisfy the requirements of being mechanically robust against various natural strains during body movement, being noninvasive to make wearing the clothing comfortable enough, be resistant to penetration of moisture, be water repellent, be either washable or easy to remove and mount before and afer washing, respectively, have a good thermal stability, and, depending on the appli- cation, have a power supply secured over a long enough period of time. Sensors measuring body parameters and transferring that information to a mobile phone have recently appeared on the market in the form of watches equipped with a few sensors that typically monitor heart rate and track the physical activity by means of the number of steps walked, possibly including GPS-acquired locations, calories burned, and sleep cycles, for example. In the near future, clinical- accuracy blood pressure measurement is expected to become available on a wrist watch as well [6]. Succeeding that, we can expect it to be integrated with the already present features, for more complete monitoring. Most recent applications transfer sensors data from a wrist watch to a wearer’s mobile phone via a Bluetooth connection [7]. Such “ftness tracker” watches are typically powered on the principle of a mobile phone—by a regular periodic charging using a USB cable. However, in spite of their attractiveness, this kind of wearables does not match the notion of smart clothing because the key devices and their functions are placed outside the clothing. Tere have also recently appeared specialized pieces of garment in the form of either a special shirt, belt, or socks that should help athletes or recreational players to monitor Hindawi International Journal of Antennas and Propagation Volume 2019, Article ID 8598912, 8 pages https://doi.org/10.1155/2019/8598912