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Construction and Design of Battery Level Indicator Circuit

Construction and Design of Battery Level Indicator Circuit

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DEDICATION

This research material, titled “Construction and Design of Battery Level Indicator Circuit” is dedicated to God for His boundless grace and guidance. It is also a tribute to all computer enthusiasts whose contributions made my research journey smoother and enriched my documentation process, making the experience truly fulfilling.



ACKNOWLEDGEMENT

I am profoundly grateful to everyone who contributed to the successful completion of this project. I am especially grateful to my Supervisor (Name), the Head of Department (Name), and the Lecturers in the Department of Electrical / Electronics Engineering (EE) for their invaluable guidance and support. I also acknowledge the contributions of authors and scholars whose works on Construction and Design of Battery Level Indicator Circuit provided essential insights. Special thanks go to my study area (and any funding organizations, if applicable) for their financial assistance. I am equally thankful to stakeholders, including mentors, teachers, and colleagues, for their encouragement and support. Finally, I deeply appreciate my family and friends for their patience and unwavering support throughout this journey. Your contributions have been instrumental in making this research a reality.



TABLE OF CONTENTS

PRELIMINARY PAGES

CHAPTER ONE

  • Introduction
  • 1.1 Project overview
  • 1.2 Advantages
  • 1.3 Disadvantages
  • 1.4 Future scope

CHAPTER TWO

  • Literature Review
  • 2.1 Theory
  • 2.2 Literature component used
  • 2.3 Review

CHAPTER THREE

  • Project Analysis
  • 3.1 Circuit diagram
  • 3.2 Description component used
  • 3.3 Working

CHAPTER FOUR

  • Methodology
  • 4.1 Software required
  • 4.2 Hardware development

CHAPTER FIVE

  • Result

CHAPTER SIX

  • Conclusion

REFERENCES


ABSTRACT

Normally, in mobile phones, the battery level is shown in dot or bar form. This lets us recognize the battery level. Here we present a circuit that lets us know the battery level of a device from the number of LED s that are glowing It uses 10 LED's in all. In this we used LM3914 IC.


Construction and Design of Battery Level Indicator Circuit

CHAPTER ONE

1.0 Introduction

1.1 Project Overview

Battery level indicator is a circuit that is used to check the battery life. We can easily recognize the battery level with the help of LED's. It uses a LM3914 driver IC use to drive 10 leds by passing through it sufficient amount of current. Brightness of leds are controlled by reference adjustable pin and reference out pin. A variable resistor is also deployed in the circuit to have variable input voltage at pin 5 of the driver IC. Since the driver IC has two modes of operation which is bar graph mode and dot mode, it enables us to have indication of the battery life either in bar form or in dot form.

We can have coloured lods to indicate state of the batteries like first three leds will indicate low battery. Green leds will indicate full battery. Thus by using various coloured leds representation of battery life will be made easy to understand. Cascading the driver ICs we can increase the range of battery input in terms of voltage. in the below given block diagram we have 4 blocks. One is the power supply. other is the driver IC itself. We will have a led block and an input block. A reference input for comparison purpose. Leds will glow according to the input given and the reference Input present.

Power supply is ranging around 12 to 18V. Reference voltage is pre decided which is 1.25mV. Any dc signal lying in the range of the power supply is judged and the level is indicated by the leds. The current through the leds is controlled by the internal adjustment.

The battery level indicator consists of very less component and thus occupies very little space of the surrounding. Since only DC input voltage levels are indicated, components which work in AC supply can be used to detect AC levels. Since AC voltage having continuously varying amplitudes the leds will turn ON and OFF continuously making a good looking pattern. Thus our battery level indicator can be used for decoration purpose also.

1.2 Advantages

  1. A battery level indicator is with electronic appliances to arrange as to display, on an indicator, a real time voltage detected by voltage indicator.
  2. Indicator indicates how much power the battery will be able to supply to electronic apparatus.
  3. It is used to check the battery level with the help of LED's for example if three LED's, indicates battery capacity of 30 percent. And if 10 LED's glow then it is 100 percent.
  4. Easily indicate the battery level
  5. Enhanced version of this circuitry is the present mobile phone battery level indication system
  6. This circuit can be used in household applications like INVERTER. This circuit connected to inverter can help the users to know when to charge and when to leave the inverter idle
  7. Minimized version of this circuit can be also used for automobiles to indicate the battery level and low cost.

1.3 Disadvantages

  1. In case of voltage matching, correct level wouldn't be indicated
  2. 1f input voltage is higher than the calibrated voltage, for full scale input error will be shown.

1.4 Scope of Study

This project can be further extended in a useful manner, The basic design of battery level indication using single IC LM39 14 can be further improved by adding display control function and alert mechanisms to enable the easy knowing of the battery level. Instead of using the LED'S and LED controller in this circuit using a microcontroller can enable battery level indication as in mobile phones.

…

CHAPTER TWO

2.0 Literature Review

2.1 Introduction

This chapter focuses on the review of related literature. A literature review includes the current knowledge as well as theoretical and methodological contributions to a particular topic. It documents the state of the art with respect to the topic you are writing. It surveys the literature in the topic selected. In this research work the literature review includes the conceputal review, theoretical framework, the review of related literature …

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