ABSTRACT
The system concept of the adhesive-type human activity-monitoring system. The device should consume extremely low power and be small sized, lightweight, flexible, and fit enough for wearing on the human body without unpleasant pulling or unnecessary sensations. The power consumption of microcomputers, wireless modules, and sensors is also becoming lower and lower; with the rapid advancement of science and technology, we believe that energy-harvesting technology is more promising for wearable sensing devices. Therefore, the Maenaka Project investigated the feasibility of solar energy, vibration power generation using electret and micromagnet, and thermal energy harvesting. Solar energy—the sun’s energy can be captured and directly converted into current electricity by using solar cells or solar photovoltaic arrays. The most important factors for the disposable adhesive-type wearable human-monitoring system are power source, small size, lightness of weight, and low cost. The wearable sensing device consumes power for the control circuit, data sensing, data processing, and wireless communication.
