Design And Construction Of A Digitally Adjustable Dancing Lights

Electrical Electronics Engineering | Industrial Physics | Physics

The design and construction of a digitally adjustable dancing lights system involve the integration of programmable microcontrollers or microprocessors with light-emitting diodes (LEDs) to create captivating visual effects synchronized with music or other stimuli. This innovative lighting solution allows users to dynamically control the pattern, color, intensity, and speed of the lights through digital interfaces such as smartphone apps or computer software. By leveraging pulse-width modulation (PWM) techniques, the brightness of individual LEDs can be precisely adjusted, enabling the creation of intricate lighting sequences with smooth transitions. Additionally, incorporating sensors or audio input modules enables the lights to react to external stimuli, such as sound or motion, further enhancing the interactive experience. Through meticulous circuit design and programming, this digitally adjustable dancing lights system offers a customizable and immersive lighting display suitable for various applications, including entertainment venues, home decor, and artistic installations, thereby captivating audiences and providing a visually engaging experience.

ABSTRACT

There are different types of adjustable dancing lights (flickering LEDs). Most of them use presets (variable resistors) to adjust the rate of switching. Being a mechanical component, the preset easily wear out with use and also introduces noise in the circuit. The adjustable dancing lights circuit presented here selects different values of resistors to control the frequency of an astable multivibrator using timer IC 555.

The circuit is built around decade counter IC 4017, a quad bilateral switch IC 4066 (to select the desired resistance) and timer 555. The decade counter output selects one of the resistors at the output of IC 4066.

TABLE OF CONTENTS

COVER PAGE

TITLE PAGE

APPROVAL PAGE

DEDICATION

ACKNOWELDGEMENT

ABSTRACT

CHAPTER ONE

1.0 INTRODUCTION

1.1 BACKGROUND OF THE PROJECT

PURPOSE OF THE PROJECT
AIM OF THE PROJECT
OBJECTIVE OF THE PROJECT
PURPOSE OF THE PROJECT
LIMITATION OF THE PROJECT
ADVANTAGES OF THE PROJECT
PROBLEM OF THE PROJECT
APPLICATION OF THE PROJECT
RESEARCH QUESTION
PROJECT ORGANISATION

CHAPTER TWO

LITERATURE REVIEW

OVERVIEW OF THE STUDY
REVIEW OF THE RELATED STUDY

CHAPTER THREE

3.0 CONSTRUCTION METHODOLOGY

3.1 BASIC OF THE SYSTEM

3.2 BLOCK DIAGRAM OF THE SYSTEM

3.3 SYSTEM OPERATION

3.4 CIRCUIT DIAGRAM

3.5 CIRCUIT DESCRIPTION

3.6 DESCRIPTION OF COMPONENTS USED

3.7 POWER SUPPLY UNIT

CHAPTER FOUR

4.0 TESTING AND RESULTS

CONSTRUCTION PROCEDURE AND TESTING
INSTALLATION OF THE COMPLET DESIGN
ASSEMBLING OF SECTIONS
TESTING OF SYSTEM OPERATION
COST ANALYSIS

CHAPTER FIVE

CONCLUSION
RECOMMENDATION
REFERENCES

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Adjustable Dancing Lights Circuit

The selected resistor changes the time period of the 555 timer circuit, whose ‘on’ and ‘off’ timings are given by:

t_on = 0.693(R9+Rx)C3
t_off = 0.693RxC3

Circuit for digitally adjustable dancing lights

In the present design, R9 = 1 kilo-ohm, C3 = 47 µF and Rx varies according to the output of IC1 (CD4017), which changes by pressing the switch S2 one by one.

When Rx=R5=5.6 kilo-ohms, t_on=0.214969 second, t_off=0.182398 second Rx=R6=10 kilo-ohms, t_on=0.358281 second, t_off=0.325710 second Rx=R7=22 kilo-ohms, t_on=0.749133 second, t_off =0.716562 second Rx=R8=33 kilo-ohms, t_on=1.107414 second, t_off=1.074843 second

Optional circuit

Whenever you momentarily press switch S2, the output of the decade counter advances to select a higher value of resistor Rx in IC 4066, which changes the switching time of the astable multivibrator. LED1 and LED2 indicate switching ‘off’ and ‘on,’ respectively, of the multivibrator.

Construction & testing

Assemble the circuit on a general-purpose PCB and enclose in a suitable case. Fix LEDs and switches on the front panel. Connect the optional circuit (above) if a higher intensity of light is needed.