Energy harvesting in IoT devices: A survey

Normally, IoT devices are powered by the batteries. As the lifetime of battery is limited thus, there is strong need of self-powered devices or alternative sources of energy to continuously power the IoT devices. For the same purpose energy harvesting techniques are used nowadays. Energy harvesting is the process of capturing energy from one or more renewable energy sources and converting them into usable electrical energy. In this paper, we are providing the survey on energy harvesting systems for IoT devices. Firstly, we discussed why energy harvesting is required and different architectures of harvesting systems. Further, we presented the energy harvesting systems considering different energy sources and their comparisons. Overall, the paper summarizes the numerous energy harvesting systems for IoT devices that act as the background for the researchers working in this area.