Abstract: New technologies advance towards providing a more connected and interactive world, allowing the development of new applications that contribute to the improvement of people's quality of life. The concept of IoT allows several devices to communicate with each other through the Internet, enabling the control of equipment remotely and capturing the state of the environment by reading sensors in real time. But for that to happen, many challenges still need to be faced. One of them is the availability of energy to supply the sensors and communication circuits. If each sensor needs a battery to supply its power, the scalability of the number of sensors connected is compromised. An alternative is to collect energy from the environment itself through transformation of light energy, for example, into electrical energy. In this lecture we will understand how technology is evolving to make it possible to power small circuits with the energy collected by small photovoltaic cells even indoors, eliminating in some cases the need for batteries. DC-DC conversion strategies for indoor applications will be discussed. In this scenario, energy is harvested from artificial light emmited by lamps. Small photovoltaic cells must be able to generate energy sufficient to power a sensor-transmitter circuit. DC-DC conversion efficiency is the key design objective in this case. Short Bio: Alessandro Girardi is associate professor at Federal University of Pampa (UNIPAMPA), Alegrete Campus, since 2007, working both in undergraduate and graduate courses in Electrical Engineering. He received a degree in Electrical Engineering from UFSM in 2000, a Master's degree in Computer Science from UFRGS in 2002 and a PhD in Microelectronics also from UFRGS in 2007. In 2018 he worked as visiting researcher at Technical University of Munich (TUM), in Munich, Germany. He coordinates research projects in the area of microelectronics, especially in the topics of energy harvesting, motion sensing, analog IC design and analog design automation. He is also co-founder of Muv, a start-up specialized in the development of IMUs for motion detection. Virtual: https://events.vtools.ieee.org/m/313583