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M. I. Baritz and M. G. Apostoaie
Fig. 1 Basic sigmoid function with two parameters (c 1 and c 2 ) [5]
found useful the implementation of the sigmoid function, even in these situations of
postural changes.
3 Experimental Setup
The experimental system used in this research is based on the construction of sensory
modules mounted on the patient’s body with low vision or blindness in major areas
that are important and easy to handle. Systems so mounted help to guide the patient’s
movement, to get a tactile and auditory sensory signal to which it has a motor
response. Thus, the positioning of sensors is determined by the height of the patient,
the type of activity they perform (walking normally or fast, stepping) and, last but
not least, the level of visual dysfunction.
Experimental modules are designed to be as easy to use and carry as it will be
attached to the subject in two essential points: at the waist, belt, and foot of the subject
through a detachable gripping system (see Fig. 2).
Also, the two sensor modules work independently but controlled by the same data
acquisition and processing system and solve a problem of orientation and perception
of obstacles in the xoz plane. These systems will alert the user if they have an obstacle,
from the legs to the hip (and slightly above). The two fastening systems are adjustable
for any person and can be worn over any kind of clothing (see Fig. 3). In modular
construction, two of the ultrasound sensors (hips and knees) scans the environment
and sends signals to the Arduino Uno board, it processes the received data and when
an obstacle encounters, and a signal is sent to the buzzer to warn the user.
The third ultrasonic sensor (mounted in the same housing as the knee) detects the
presence of the travel surface (within a set distance within the customized parameters), and when it is no longer detected, the buzzer will emit a tone specific to the
situation one step is met. The entire system is compact, low weight, ergonomic, and
easy to use for patients with low vision or blindness. The system is assembled into
M. I. Baritz and M. G. Apostoaie
Fig. 1 Basic sigmoid function with two parameters (c 1 and c 2 ) [5]
found useful the implementation of the sigmoid function, even in these situations of
postural changes.
3 Experimental Setup
The experimental system used in this research is based on the construction of sensory
modules mounted on the patient’s body with low vision or blindness in major areas
that are important and easy to handle. Systems so mounted help to guide the patient’s
movement, to get a tactile and auditory sensory signal to which it has a motor
response. Thus, the positioning of sensors is determined by the height of the patient,
the type of activity they perform (walking normally or fast, stepping) and, last but
not least, the level of visual dysfunction.
Experimental modules are designed to be as easy to use and carry as it will be
attached to the subject in two essential points: at the waist, belt, and foot of the subject
through a detachable gripping system (see Fig. 2).
Also, the two sensor modules work independently but controlled by the same data
acquisition and processing system and solve a problem of orientation and perception
of obstacles in the xoz plane. These systems will alert the user if they have an obstacle,
from the legs to the hip (and slightly above). The two fastening systems are adjustable
for any person and can be worn over any kind of clothing (see Fig. 3). In modular
construction, two of the ultrasound sensors (hips and knees) scans the environment
and sends signals to the Arduino Uno board, it processes the received data and when
an obstacle encounters, and a signal is sent to the buzzer to warn the user.
The third ultrasonic sensor (mounted in the same housing as the knee) detects the
presence of the travel surface (within a set distance within the customized parameters), and when it is no longer detected, the buzzer will emit a tone specific to the
situation one step is met. The entire system is compact, low weight, ergonomic, and
easy to use for patients with low vision or blindness. The system is assembled into