8085 PROJECT REPORT8085projects.in/wp-content/uploads/2016/12/33ec13.19ec13.Report.pdfINTRODUCTION The project “Hoop the loop” is a project based on Intel 8085 microprocessor.

8085 PROJECT REPORT

“HOOP THE LOOP”

APOORV SOOD-33/EC/13

AKSHAY KUMAR-19/EC/13

INDEX

1. INTRODUCTION

2. SYNOPSIS

3. BLOCK DIAGRAM AND WORKING

4. HARDWARE DEVELOPMENT

1. LIST OF COMPONENTS

2. SCHEMATIC

3. BOARD LAYOUT

4. SOLDERED BOARD

5. ASSEMBLY CODE AND FLOWCHART

6. TESTING AND DEBUGGING

7. GANNTT CHART REVISITED

8. BIBLIOGRAPHY

9. CONCLUSION

10.TOOLS USED

INTRODUCTION

The project “Hoop the loop” is a project based on Intel

8085 microprocessor. This is an 8 bit microprocessor that

can be interfaced with maximum 64k bytes of memory. It

consists of a 16 bit Address bus and 8 bit data bus that is

demuxed from lower order address bus. These buses help

in selecting and transferring data to and from memory as

well as external devices. For processing purposes the

8085 consists of 8 registers namely A,B,C,D,E,F,H,L that

are 8bit registers and PC,SP that are 16 bit registers.The

8085 has 74 instructions at it’s disposal for processing

data.

SYNOPSIS

This project uses 8 bit Intel 8085 microprocessor to

implement basketball score counter similar to what is seen

in the gaming zones of shopping malls. Score(Number of

baskets) can be counted from 0 to 99 and is displayed on

2 common anode seven segment displays. The circuit

uses a Light Dependent Resistor as detecting device to

determine if a basket has been scored and is powered by

a 5volt powerbank.

BLOCK DIAGRAM AND WORKING

POWER SUPPLY(5V)

8085 uP

ROM(32K) RAM(32K)

INPUT INTERFACE

BUFFER

CO

MP

AR

ATO

R

LDR

INP

UT

OUTPUT INTERFACE A

DD

RES

S

DEC

OD

ER

LATCH

LATCH

SEVEN

SEGM

ENT D

ISPLA

YS

WORKING

This project consists of a laser and LDR connected around the

ring such that the laser is continuously falling on the Light

dependent resistance making the resistance 0, hence logic 0 is

sent in the input line D0.When a basket is scored the laser

falling on the LDR is interrupted causing the LDR resistance to

increase and making the input line D0 logic 1 after going

through the comparator. This input is sent to the 8085 through

input buffer after processing it increments the count and

displays it on the 2 seven segment displays.

Everytime a basket is scored the count is incremented and

displayed on the displays, hence working as a score counter.

HARDWARE DEVELOPMENT

1.LIST OF COMPONENTS PART DEVICE PACKAGE NUMBER

8085 8085 DIL 40 1

RAM 62256P DIL 28-6 1

ROM AT28C256 DIL 28-6 1

CRYSTAL CRYSTALHC49US HC49US

8-bit latch 74HC573N DIL20 3

3X8 DECODER 74HCT138N DIL16 1

Octal BUFFER 74HC244N DIL20 1

2X4 DECODER 74S139N DIL16 1

OP AMP LM358N DIL08

NAND gate 7400N DIL14 1

LED LED5MM LED5MM 3

7 SEGMENT LED DISPLAY

HD-H101 HDSP-M 2

RESISTOR R-US_0204/7 0204/7 31

CAPACITOR C-EU025-025X050 C025-025X050 15

OMRON SWITCH

10-XX B3F-10XX 2

CONNECTOR M02 02P 1

PRESET PRESET_LR PRESET_LR 1

USB CONNECTOR

USB(POWER) USB(POWER) 1

LASER

1

LDR

1

CONNECTING WIRES

Board layout

SCHEMATIC

BOARD BOTTOMSIDE

BOARD TOPSIDE

CODE AND FLOWCHART

PREPARE LOOK UP

TABLE FOR SS DISPLAY

INITIALIZE STACK

POINT HL TO 1ST LOOK UP TABLE LOCATION

INITIALIZE SEVEN SEGMENTS TO DISPLAY 00

CHECK

BASKET NO

YES

INCREMENT HL PAIR

OUT TO TENS SS DIPLAY

INCREMENT HL PAIR

OUT TO ONES SS DISPLAY

0.5 SECOND DELAY

99 ON SS

DISPLAY

NO

YES

END

TESTING AND DEBUGGING 1. For testing the board,1st the ‘SID-SOD line test ‘ was conducted to

check the working of RAM ,ROM ,8085, demux Latch. This test failed

in the 1st attempt but ran successfully after changing the ROM hence

the ROM was replaced by a new one.

2. Rest of the ICs and the seven segment displays were tested by

measuring voltage using the multi meter. The results were satisfactory.

3. To test the connections and soldering of the board, programs to display

different numbers on the displays were written in the ROM and run but

different numbers were being displayed. This error was removed by

resoldering the displays along with their resistors and latches.

4. Input LDR circuit was verified by checking the input LED connected

btw ground and output of LDR circuit. Appropriate reference voltage

was set using the trim pot.

GANTT CHART REVISITED

ORIGINAL GANTT CHART

FINAL GANTT CHART

CONCLUSION

Overall, it was a good learning experience on how useful things can be

created using microprocessor and other components. It gave an

understanding of how hardware and software can combine with and

complement each other to give us useful products.Facing different problems

and then soving them in course of completing the project have helped us

develop skills to understand problems and then devise effective solutions to

remove them..

BIBLIOGRAPHY

.Ramesh Gaonkar, Microprocessor Architecture, Programming

and Applications with the 8085, Sixth edition.

.Datasheets of all components used

ACKNOWLEGEMENT We are grateful to Prof. Dhananjay V Gadre who gave us the

opportunity to present our project as part of EC 316 course and

supported us throughout the development of our project. We would like

to thank our friends who gave us constant moral support during

preparation of this project. Special thanks to CEDT members especially

Abhishek Kapoor for their constant support. Last but not the least,

thanks to our families for supporting us.

TOOLS USED

SOFTWARE TOOLS:

1. EAGLE 6.60

2. 8085 simulator IDE oshonsoft

3. Jubin 8085 simulator

4. EEPROM programmer.jar by anshuman Mishra

HARDWARE TOOLS:

1. EEPROM programmer

2. older iron

3. Multimeter

4. Solder station

5. Tweezer

6. Cutter