The present study is aimed to analyse the relationships of human responses to sudden changes in visual or hearing stimulations with respect to the age. As the accuracy of measurement of the time interval is significant in the study of human response, a microcontroller‐based time measurement system is designed and developed with a resolution of 1 µs. The hardware of the device takes care of the generation and management of the clock through I/O ports of the microcontroller, while software captures and computes the response time. The effect of age on human responses to both visual and hearing stimuli was studied, and the natures of both the responses were compared. The results were analysed to determine the characteristics of human responses and the relationship between human response, type of stimulus, and age. It was shown that the human visual and hearing response‐times increase with age, and the hearing response is faster than visual response.
The paper deals with a new design of a capacitive sensor developed for the accurate and precise measurement of mass. It employs a co-axial cylinder based capacitive sensor whose capacitance decreases linearly with mass, due to the shielding effect of the conducting shield, which moves between the stationary cylinders of the capacitor with the movement of the mass holder. An accurate capacitance to voltage converting system is used to detect the mass in terms of voltage. Linear relationship between mass and output signal is obtained with the help of microcontroller. The presented sensor has high order of linearity, flexibility in design and controllable damping. The overall size of the sensor may be reduced to very small values by this design. It is highly robust and may be attached to any complex system. For the spring, used in the system, mass sensor can measure up to 7 kg.
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