Micro Processor Mini Project,Electronic Quiz Table

1. EC1258 – MICROPROCESSOR LAB
MINI PROJECT
ELECTRONIC QUIZ
TABLE
SUBMITTED BY
SUBHASHINI.S
Department of IT

2. CONCEPT
 This project can be used in Quiz competitions.
 The circuit is based on Microprocessor.
 Simultaneously five players can participate in this game.
 It has five separate LED’s to indicate who has pressed
the key and it also display the number on the seven
segment display of the microprocessor kit.
ELECTRONIC QUIZ TABLE

3. CONCEPT
Continue…
 The Reset switch is used to reset all the switches and
the circuit will get ready for the next round.
 The above system is monitored and controlled by the
8 bit microprocessor 8085 and using the Ports of 8255.
ELECTRONIC QUIZ TABLE

4. CONCEPT
Continue…
 The Microprocessor continuously monitors the five
switches and if any one of the switch is pressed then it
latches the switch and the microprocessor switch on
the corresponding LED and display the number in the
seven segment switch.
 A Buzzer sound is also produced to indicate that some
one has pressed any one of the Switch.
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5. BLOCK DIAGRAM
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6. FLOW CHART
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7. CIRCUIT DIAGRAM
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8. SOURCE CODE
0000 PORTA EQU 0CH
0000 PORTB EQU 0DH
0000 REG EQU 0EH
0000 ORG 4100H
4100 3E 94 MVI A,94H
4102 D3 0E OUT REG
4104 3E DF MVI A,11011111B
4106 D3 0D OUT PORTB
ELECTRONIC QUIZ TABLE

9. SOURCE CODE
Continue…
4108 DB 0C TOP: IN PORTA ;get switch1 status
410A E6 02 ANI 00000010B ;check first button
410C C2 2E 41 JNZ SW1
410F DB 0C IN PORTA ;get switch2 status
4111 E6 04 ANI 00000100B ;check second button
4113 C2 38 41 JNZ SW2
4116 DB 0C IN PORTA ;get switch3 status
4118 E6 08 ANI 00001000B ;check third button
411A C2 42 41 JNZ SW3
ELECTRONIC QUIZ TABLE

10. SOURCE CODE
Continue…
411D DB 0C IN PORTA ;get switch4 status
411F E6 10 ANI 00010000B ;check fourth button
4121 C2 4C 41 JNZ SW4
4124 DB 0C IN PORTA ;get switch5 status
4126 E6 20 ANI 00100000B ;check fifth button
4128 C2 56 41 JNZ SW5
412B C3 08 41 JMP TOP
412E 3E FE SW1: MVI A,11111110 B ;switch ON 1 LED
4130 D3 0D OUT PORTB
4132 CD 70 41 CALL DELAY
ELECTRONIC QUIZ TABLE

11. SOURCE CODE
Continue…
4135 C3 5D 41 JMP DOWN
4138 3E FD SW2: MVI A,11111101B ;switch ON 2 LED
413A D3 0D OUT PORTB
413C CD 70 41 CALL DELAY
413F C3 5D 41 JMP DOWN
4142 3E FB SW3: MVI A,11111011B ;switch ON 3 LED
4144 D3 0D OUT PORTB
4146 CD 70 41 CALL DELAY
4149 C3 5D 41 JMP DOWN
414C 3E F7 SW4: MVI A,11110111B ;switch ON 4 LED
414E D3 0D OUT PORTB
ELECTRONIC QUIZ TABLE

12. SOURCE CODE
Continue…
4150 CD 70 41 CALL DELAY
4153 C3 5D 41 JMP DOWN
4156 3E EF SW5: MVI A,11101111B ;switch ON 5 LED
4158 D3 0D OUT PORTB
415A CD 70 41 CALL DELAY
415D 79 DOWN: MOV A,C
415E E6 1F ANI 1FH
4160 D3 0D OUT PORTB
4162 DB 0C D1: IN PORTA
4164 E6 01 ANI 01H
ELECTRONIC QUIZ TABLE

13. SOURCE CODE
Continue…
4166 CA 62 41 JZ D1
4169 3E DF MVI A,11011111B
416B D3 0D OUT PORTB
416D C3 08 41 JMP TOP
4170 DELAY:
4170 4F MOV C,A
4171 06 02 MVI B,02H
4173 11 0F 00 LOOP1: LXI D,0FH
4176 1B LOOP: DCX D
4177 7B MOV A,E
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14. SOURCE CODE
Continue…
4178 B2 ORA D
4179 C2 76 41 JNZ LOOP
417C 05 DCR B
417D C2 73 41 JNZ LOOP1
4180 C9 RET
4181 END
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15. WORK FLOW
Move The Immediate data 1101111 B to Accumulator
Get the Status of Switch 1
To Check the first Button - Perform the Immediate AND Operation 0000010
With ACC value 1101111 B
1 1 0 1 1 1 1 1
0 0 0 0 0 0 1 0
0 0 0 0 0 0 1 0
If no zero Jump To sw1
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16. WORK FLOW
SWITCH ON LED ONE
move the data to Acc 1111 1110 B
Call the Delay Program
In Delay
Move the Acc value to C Register
And load the OF H (0000 11111 B)value to DE register Pair
Perform the logical ORA Operation
Then Jump Down ELECTRONIC QUIZ TABLE

17. WORK FLOW
In Jump
Move C register Value to Accumulator
Perform the Immediate AND Operation with the value(0F H)
Finally Reset the Acc Value with 1101111 B
Like Wise all the switches are tested.
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18. Initially all LEDs set to off
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19. Microprocessor Found the switch then the led will glow and buzzer is on
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20. Microprocessor Found the pressed switch then the led will glow and buzzer is on the
No shown the 7 – Segment LED
SEVEN DEGMENT LED
ELECTRONIC QUIZ TABLE