Thursday, 19 May 2016

Design And Construction Of Resistor Colour Code Calculator Project


ABSTRACT

A resistor colour code calculator is an electronic system that calculates the resistance of a resistor simply by pressing the keys that correspond to the colour code. The system consist of five basic stages, the key board which accepts the input command, the encoder which receives the command from the key board and forms a corresponding binary code from the encoder, the BCD to 7 segment decoder which reverses the binary code from the memory and forms a comprehensive code which then displays by light emitting diode (LED) sensor. Input decimal signals from the input keys were connected to a corresponding binary code by the diode matrix (encoder) this code were then inverted and stored in the memory unit (flip-flop) the BCD to decimal 7-segment decoder is an I.C of the SN 74 family which then rearrange the BCD Code to 7-segment arrangement which is as follows: - 





All the input keys are coloured to represent the colour of the resistor code (Black-White) When a key is pressed a code is formed which represent the code of that colour (e.g. Red = 2), To compute the resistance of a given resistor, the color of the first band is entered to the first channel which counts, decodes and display numeric value on the channel display digit. The second and the third follow the same sequence. The combine result of resistor of the three digits on the display gives the value of the resistor (i.e. digitally). Several test using various combinations of colour code carried out using both A.C and D.C gave a positive output of same values as calculated values.



TABLE OF CONTENT
Title page
Declaration
Approval page
Dedication
Acknowledgement
Abstract
Table of content
List of figures
List of plates

Chapter One
1.0       Introduction
1.1       Preamble
1.2       Block Diagram
1.3       Aims and objectives
1.4       Justification

Chapter Two
2.0       Literature Review
2.1       Resistor
2.2       Carbon resistor colour code calculation        
2.3       advantages of an electronic resistor colour code calculator    
2.4       Component review      
2.4.1    Diodes
2.4.2    Capacitors
2.4.3 Light emitting diode (LED)
2.4.4 The 555 time IC 

Chapter Three
3.0       Circuit Design and construction       
3.1       Circuit Diagram
3.2       Circuit Design
3.2.1    Power supply
3.2.2    Switching unit
3.2.3    The counter
3.2.4    The decoder
3.2.5    CD4017
3.3       Circuit construction
3.4       Packaging of resistor colour code calculator
3.5       Principle of operation 

Chapter Four           
4.0       Test and Result           
4.1       Test
4.2       Result

Chapter Five
5.0       Discussion, Recommendation and Conclusion
5.1       Discussion      
5.2       Recommendation
5.3       Conclusion
References
Appendices 
 


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