I. INTRODUCTION
WEARABLE sensors have become very popular in many
applications such as medical, entertainment, security,
and commercial fields. They can be extremely useful in
providing accurate and reliable information on people’s
activities and behaviors, thereby ensuring a safe and sound
living environment. It may be that the smart wearable sensors
technology will revolutionize our life, social interaction and
activities very much in the same way that personal computers
have done a few decades back.
Wearable sensors in the form of panic buttons for emergency
help have been in use for a long time and are a huge
commercial success [1], [2]. Of course for proper utilization
the person needing help should be alert and fit enough to press
the button. Most importantly, the panic button should be light
in weight so that it is comfortable to wear 24/7.
In recent times there has been a surge of usages of wearable
sensors, especially in the medical sciences, where there are
a lot of different applications in monitoring physiological
activities. In the medical field, it is possible to monitor
patients’ body temperature, heart rate, brain activity, muscle
motion and other critical data [3], [4]. It is important to have
very light sensors that could be worn on the body to perform