Abstract
There are various small energy sources such as renewable energy which can be transferred to electrical energy. For example, sunlight, indoor light, heat, vibration, radio wave, etc. Energy harvesting is the technique to transfer these energies to electrical energy. In recent years, energy harvesting devices attract attention as an independent generator of the wireless sensor node. We think human action, heat, indoor light are energy sources to easy to get in our life and we are developing the harvesting devices such as piezoelectric generators and thermoelectric generators, photovoltaic devices which can convert these three energy into electrical energy. In this paper, I mention the structure and characteristics about dye sensitized photovoltaic device which is superior in generating by indoor light, particularly feeble light. Furthermore, I introduce “Watching system” as an applied example about wireless sensor network using this device.
