As we are all aware batteries have a level of charge which can be understood as the amount of voltage contained in your battery. This course aims to teach you how to make your Arduino-based voltage indicator that consumes much less power than the one you will buy. It starts by defining why you should monitor your battery level and the hardware and software requirements for this project.The course then explains what an LED bar is and its working principles. Next it discusses how an Arduino measures battery level. LCDs (liquid crystal displays) are widely used devices that come in different forms varying in size shape and many other features. In our project you will learn about LCDs' working principles and purpose. An Analog Digital Converter (ADC) is used to convert the analogue input voltage to its digital form which will be comprehended.Next the circuit schematic and coding process will be explained. You will also understand all aspects of practical work and how to measure high voltage levels. Following that you will learn how to increase your project efficiency by reducing power consumption. The final section will focus on different methods for reducing the power consumption of an Arduino either by changing some hardware or using some special codes.