ISSN(Online): 2319 - 8753 ISSN (Print) :2347 - 6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 5, May 2015 Copyright to IJIRSET DOI: 10.15680/IJIRSET.2015.0405129 3744 Miniaturisation of Wearable Sensor for Stress Monitoring Using Electrodermal Activity Mohnesh Singh¹, Neelam Rup Prakash² ¹Post Graduate Scholar, Department of Production Engineering, PEC University of Technology, Chandigarh, India ²Professor, Department of Electronics and Telecommunication Engineering, PEC University of Technology, Chandigarh, India ABSTRACT : Earlier a solution for a device for measurement of stress using Electrodermal Activity was provided. As a further challenge to make the device more user friendly for continuous monitoring of Electrodermal Activity an effort to miniaturise the circuit has been made with aim of designing the device in a wristband which can be worn by a person at all times at home or workplace. The aim was to make the device comfortable, light weight and more versatile for logging the data over long periods of time under different stress conditions so that it is available for further clinical correlation medically. Intelligent wearable healthcare system are in demand by the health care industry. This paper therefore presents a solution of miniaturised device to measure stress by monitoring the Electrodermal Activity. KEYWORDS : Data Logging , Electrodermal Activity, Microcontroller, Miniaturisation, Serial Communication, Stress, Wearable Sensor, Wireless Communication. I. INTRODUCTION The trend of miniaturisation has been constantly improving since over a half century. Miniaturisation technology began with the third industrial revolution in 1947. In 1982 the first transistor was developed which led to the miniaturisation by microsystem technology. By 1995 the miniaturisation transformed to the nanotechnology that is manufacturing devices to a nanometer scale i.e 10‾฀ meters. This involves highly sophisticated techniques of electronic packaging which implies interfacing the IC’s with other components. The ultimate emphasis is on the reduced size, light weight, low cost, high functionality, ease of connectivity and use [1]. Keeping in view the above mentioned aspects it was important to make the stress monitoring device with least form factor and ease of use by a person without hindering his activities at home or workplace. It was therefore decided to make the device wearable as a wristband with embedded miniature electronic circuits so as to achieve continuous monitoring of the stress levels through detection of Electrodermal Activity. II. DESIGN AND DEVELOPMENT OF PROTOTYPE Previously a functional portable prototype was developed but it was not convenient to constantly carry the device while working at home or workplace. The design was therefore further improved upon by miniaturisation of the circuits. The basic functional block diagram of the stress monitor is as shown below at Figure 1.