Piezoresistive Sensors Fabricated With Conductive Textiles For Monitoring The Step Rate With Read-Out Electronics And Wireless Connection To A Smart Watch
Soft sensors made with conductive smart textiles have been developed for connecting with the environment, increasing operator safety, entertainment and physiological parameter monitoring. This paper describes the fabrication processes for smart textiles with conductive fibers made with different types of metal filaments and explains the design choice for pressure measurements with soft sensors. This new type of materials is investigated for the design of a removable insole sensor for step rate monitoring. The main components integrated into the wearable device are a piezoresistive sensor, a low power analog front-end and a wireless connection with a smart watch device. The dynamic behavior of the piezoresistive is characterized and the output voltage waveform is processed to estimate the step rate per second. The advantage of a customize graphical user interface on the display of the smart watch allowed easy monitoring of the step rate from the average pressure variation on the sensorized insole during walking and running. The paper demonstrates that this sensor technology can be used to design different types of piezoresistive sensors with multiple elements to record dynamically the spatial distribution of foot pressure.
Lorenzo Capineri
Department of Information Engineering, University of Florence, Via S. Marta 3, 50139, Firenze, Italy
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Design of TENS electrodes using conductive yarn
The paper aims to develop textile-based transcutaneous electrical nerve stimulation (TENS) electrodes using conductive yarn to bring a solution to uncomfortable feelings and hygiene problems of conventional conductive hydrogel electrodes. It proposes washing process, resistance measurements and subjective tests to evaluate the performance of the developed textile-based electrode.
In this study, six different textile electrode pairs were designed and produced with different patterns. Designed electrodes were washed for ten times. In order to evaluate the effect of pattern differences and washing process on electrode performances, two different tests were realized before and after washing. The first of these tests is resistance measurement with a multimeter, and the second one is subjective test carried out on subjects.
The results obtained from resistance measurements indicated that the pattern differences cause resistance values of electrodes to change. It is reported that subjects had electrical stimulation from all electrode samples in conducted trials and it is noticed that washing process does not cause any stimulation problems.
In this study, textile-based TENS electrodes having different patterns were produced by machine stitching technique and their long-term usage behaviors were examined with repeated washing processes and trials on the subjects.
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Duygu Erdem , Sevil Yeşilpınar , Yavuz Şenol , Didem Karadibak , Taner Akkan , (2016) "Design of TENS electrodes using conductive yarn", International Journal of Clothing Science and Technology, Vol. 28 Iss: 3, pp. -
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