Real-Time Processing Library for Open-Source Hardware Biomedical Sensors

Applications involving data acquisition from sensors need samples at a preset frequency rate, the filtering out of noise and/or analysis of certain frequency components. We propose a novel software architecture based on open-software hardware platforms which allows programmers to create data streams from input channels and easily implement filters and frequency analysis objects. The performances of the different classes given in the size of memory allocated and execution time (number of clock cycles) were analyzed in the low-cost platform Arduino Genuino. In addition, 11 people took part in an experiment in which they had to implement several exercises and complete a usability test. Sampling rates under 250 Hz (typical for many biomedical applications) makes it feasible to implement filters, sliding windows and Fourier analysis, operating in real time. Participants rated software usability at 70.2 out of 100 and the ease of use when implementing several signal processing applications was rated at just over 4.4 out of 5. Participants showed their intention of using this software because it was percieved as useful and very easy to use. The performances of the library showed that it may be appropriate for implementing small biomedical real-time applications or for human movement monitoring, even in a simple open-source hardware device like Arduino Genuino. The general perception about this library is that it is easy to use and intuitive

Design and development of a 5-Channel Arduino-Based Data Acquisition System (ABDAS) for experimental aerodynamics research

In this work, a new and low-cost Arduino-Based Data Acquisition System (ABDAS) for use in an aerodynamics lab is developed. Its design is simple and reliable. The accuracy of the system has been checked by being directly compared with a commercial and high accuracy level hardware from National Instruments. Furthermore, ABDAS has been compared to the accredited calibration system in the IDR/UPM Institute, its measurements during this testing campaign being used to analyzed two different cup anemometer frequency determination procedures: counting pulses and the Fourier transform. The results indicate a more accurate transfer function of the cup anemometers when counting pulses procedure is used

Low cost autonomous lock-in amplifier for resistance/capacitance sensor measurements

This paper presents the design and experimental characterization of a portable high-precision single-phase lock-in instrument with phase adjustment. The core consists of an analog lock-in amplifier IC prototype, integrated in 0.18 µm CMOS technology with 1.8 V supply, which features programmable gain and operating frequency, resulting in a versatile on-chip solution with power consumption below 834 µW. It incorporates automatic phase alignment of the input and reference signals, performed through both a fixed-90° and a 4-bit digitally programmable phase shifter, specifically designed using commercially available components to operate at 1 kHz frequency. The system is driven by an Arduino YUN board, thus overall conforming a low-cost autonomous signal recovery instrument to determine, in real time, the electrical equivalent of resistive and capacitive sensors with a sensitivity of 16.3 µV/O @ erS < 3 % and 37 kV/F @ erS < 5 %, respectively

Exploring the TAM3 factors of technology adoption in South African SMMEs

This study is aimed at assisting businesses to improve the adoption of technology by exploring the factors that influence the adoption of technology. This study explored the factors that influence adoption or usage of technology based on the Adoption of Technology Model 3 (TAM3) as it relates to Small Medium and Micro Enterprises (SMMEs) in South Africa. The study investigates the use or adoption of technology based on the TAM3 factors of Perceived usefulness, perceived ease of use, subjective norm, job relevance, image, results demonstrability, output quality, perceived ease of use, computer self-efficacy, perception of external control, computer anxiety, computer playfulness, perceived enjoyment and level of education. The study employed quantitative methods of data collection and analysis in order to ensure reliability and generalisability of the results. This was conducted in the form of an empirical study, done through QuestionPro mail survey amongst 51 business owners and managers of SMMEs. The purpose of the study was to explore the TAM3 factors in the adoption of technology on SMMEs in relation to South African SMMEs. The major findings from the study indicated perceived usefulness and subjective norm as the main factors influencing the adoption of technology in South African SMMEs. Recommendations were made to management and business to ensure that they encourage the behaviours, demonstrate technology usage and to create a conducive environment that fosters the adoption of technology. Based on the study, it is recommended that business owners or managers create an enabling environment to foster and promote subjective norm and perceived usefulness as the main factors for the adoption of technology in South African SMMEs. Training, regular use of technology in business and social environments, normalisation of use of technology within SMMEs and the infusion of technology in all business cycles were recommended as enablers in the adoption of technology. Adoption or usage of technology by South African SMMEs can be done by focusing on perceived usefulness and subjective norm constructs as the main factors.Thesis (MBA) -- Faculty of Business and Economic Sciences, 202

Exploring the TAM3 factors of technology adoption in South African SMMEs

This study is aimed at assisting businesses to improve the adoption of technology by exploring the factors that influence the adoption of technology. This study explored the factors that influence adoption or usage of technology based on the Adoption of Technology Model 3 (TAM3) as it relates to Small Medium and Micro Enterprises (SMMEs) in South Africa. The study investigates the use or adoption of technology based on the TAM3 factors of Perceived usefulness, perceived ease of use, subjective norm, job relevance, image, results demonstrability, output quality, perceived ease of use, computer self-efficacy, perception of external control, computer anxiety, computer playfulness, perceived enjoyment and level of education. The study employed quantitative methods of data collection and analysis in order to ensure reliability and generalisability of the results. This was conducted in the form of an empirical study, done through QuestionPro mail survey amongst 51 business owners and managers of SMMEs. The purpose of the study was to explore the TAM3 factors in the adoption of technology on SMMEs in relation to South African SMMEs. The major findings from the study indicated perceived usefulness and subjective norm as the main factors influencing the adoption of technology in South African SMMEs. Recommendations were made to management and business to ensure that they encourage the behaviours, demonstrate technology usage and to create a conducive environment that fosters the adoption of technology. Based on the study, it is recommended that business owners or managers create an enabling environment to foster and promote subjective norm and perceived usefulness as the main factors for the adoption of technology in South African SMMEs. Training, regular use of technology in business and social environments, normalisation of use of technology within SMMEs and the infusion of technology in all business cycles were recommended as enablers in the adoption of technology. Adoption or usage of technology by South African SMMEs can be done by focusing on perceived usefulness and subjective norm constructs as the main factors.Thesis (MBA) -- Faculty of Business and Economic Sciences, 202