S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Multifunctional Bicycle Helmet Using Internet of Things Technology

Pu-Sheng Tsai, Nien-Tsu Hu, Ter-Feng Wu, Jen-Yang Chen, and Tzu-Hung Chao

(Received October 21, 2020; Accepted March 15, 2021)

Keywords: bicycle safety helmet, internet of things, mobile app, GPS positioning

This paper presents a bicycle safety helmet with a variety of novel functions based on internet of things technologies: (1) LED direction indicators triggered by a 3-axis accelerometer to sense the rider tilting his/her head in the desired direction; (2) LED light bars circling the helmet triggered by a photodetector to provide illumination or to act as a flashing safety beacon; (3) a keypad based on ceramic pressure sensors to input the password for the bicycle lock with Bluetooth for transmission; (4) ultrasonic sensors to detect vehicles approaching from the rear with a mechanism to alert the rider; (5) wireless connectivity to transmit GPS positioning information, including UTC time, longitude and latitude, altitude, horizontal dilution of precision (HDOP), and the number of connected satellites to a cloud server. We also created a software package accessible via a web server or mobile app to query the current location and route.

Corresponding author: Pu-Sheng Tsai




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