Report no.3(microprocessor)

Dec 12, 2013Download as docx, pdf

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This document summarizes three experiments using 7-segment displays: 1) Interfacing a single 7-segment display to display numbers 0-9 using a 74LS47 decoder chip. 2) Interfacing two 7-segment displays to display numbers 0-99 using demultiplexing with a 74LS47 chip. 3) Interfacing four 7-segment displays to display using multiplexing, transistors, and a 74LS47 chip. The document provides background on 7-segment displays, decoders, and multiplexing/demultiplexing techniques. Diagrams and code are included for each experiment.

Date: 12/11/2013

Al-Azhar University-Gaza
Faculty of Engineering & Information
Technology
Microprocessors & Interfacing
(ITCE 3306)
LAB NO.3
7-Segment Display
Prepared By:
Ronza sameer Abu jayyab
No. 20111511

Submitted To:
Eng. Mahmoud I. Hasanain

First semester
2013/2014

 Introduction:
In this lab will develop capabilities in dealing with 7-segment and how we can
display out put in its screen.

 Objectives:
-

Understand how 7-segment work and display out put in its screen.
Know how to deal with type of 7-segment technique (multiplexing and
demultiplexing).

 Background:
 Light emitter diodes (LEDs):
 Seven segment displays:
 Binary to 7-segment decoder driver:
 BCD to 7-segment display controller:

 Interfacing 7-segment to PC through parallel printer port:
 Demultiplexing technique:
 Multiplexing technique:

 Expriments:
 Experiments general steps:
i.
ii.
iii.

Connect 7-segment with Vcc voltage.
Connect resister from the other side of the 7-segment.
Then, connect 7-segment with resister with the 74Ls47.

 Experiment no. (1):
Seven-segment interface display no. from 0 to 9.
Interface one 7-segment displays with a PC through the parallel printer
board (LPT) to display numbers from 0-9.
Experiments spical steps:
1. Connect one 7-segment with Vcc = 5V.
2. Connect 7-segment from other side with seven resister.
3. Connect 7 resisters from other side with 74LS47 decoder.
4. Then, connect D0, D1, D2, D3 which out from 74LS47 decoder
with
Control code:

Fig-1-

 Experiment no. (2):
Seven-segment interface using demultiplexing.
Using demultiplexing technique provide an interface of two 7-segment
displays to a PC through the parallel printer board (LPT), to display
numbers from 0 to 99.
Expriments spical steps:
1. Connect two 7-segment togather.
2. Then, connect them with voltage Vcc= 5V.
3. Connect each 7-segment from other side with seven resister.
4. Connect 7 resisters for first 7-segment with D0, D1, D2, D3 from
74LS47 decoder and second 7-segment with D4, D5, D6, D7 with
other side from 74LS47 decoder.
5. Finally, Then, connect D0, D1, D2, D3, D4, D5, D6, D7 which out
from 74LS47 decoder with
Control code:

Fig-2-

 Experiment no. (3):
seven segment interface using multiplexing.
Using multiplexing technique provide an interface of 4 7-segment displays
to a PC time through the parallel printer board (LPT).
Experiments spical steps:
1. Connect 4 7-segment togather then connect them with Vcc voltage
equal 5V.
2. Joint each 7-segment with 7 resisters.
3. Joint 74LS47 decoder from the other side of resisters.
4. Use pnp transistor and connect four transistors with 4 7-segments.
5. Connect each transistor with resister (R=5Kohm or 4.7Kohm).

Fig-3-

Control code:

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Report no.3(microprocessor)

1. Date: 12/11/2013 Al-Azhar University-Gaza Faculty of Engineering & Information Technology Microprocessors & Interfacing (ITCE 3306) LAB NO.3 7-Segment Display Prepared By: Ronza sameer Abu jayyab No. 20111511 Submitted To: Eng. Mahmoud I. Hasanain First semester 2013/2014

2.  Introduction: In this lab will develop capabilities in dealing with 7-segment and how we can display out put in its screen.  Objectives: - Understand how 7-segment work and display out put in its screen. Know how to deal with type of 7-segment technique (multiplexing and demultiplexing).  Background:  Light emitter diodes (LEDs):  Seven segment displays:  Binary to 7-segment decoder driver:  BCD to 7-segment display controller:  Interfacing 7-segment to PC through parallel printer port:  Demultiplexing technique:  Multiplexing technique:  Expriments:  Experiments general steps: i. ii. iii. Connect 7-segment with Vcc voltage. Connect resister from the other side of the 7-segment. Then, connect 7-segment with resister with the 74Ls47.  Experiment no. (1): Seven-segment interface display no. from 0 to 9. Interface one 7-segment displays with a PC through the parallel printer board (LPT) to display numbers from 0-9. Experiments spical steps: 1. Connect one 7-segment with Vcc = 5V. 2. Connect 7-segment from other side with seven resister. 3. Connect 7 resisters from other side with 74LS47 decoder. 4. Then, connect D0, D1, D2, D3 which out from 74LS47 decoder with Control code:

3. Fig-1-  Experiment no. (2): Seven-segment interface using demultiplexing. Using demultiplexing technique provide an interface of two 7-segment displays to a PC through the parallel printer board (LPT), to display numbers from 0 to 99. Expriments spical steps: 1. Connect two 7-segment togather. 2. Then, connect them with voltage Vcc= 5V. 3. Connect each 7-segment from other side with seven resister. 4. Connect 7 resisters for first 7-segment with D0, D1, D2, D3 from 74LS47 decoder and second 7-segment with D4, D5, D6, D7 with other side from 74LS47 decoder. 5. Finally, Then, connect D0, D1, D2, D3, D4, D5, D6, D7 which out from 74LS47 decoder with Control code:

4. Fig-2-  Experiment no. (3): seven segment interface using multiplexing. Using multiplexing technique provide an interface of 4 7-segment displays to a PC time through the parallel printer board (LPT). Experiments spical steps: 1. Connect 4 7-segment togather then connect them with Vcc voltage equal 5V. 2. Joint each 7-segment with 7 resisters. 3. Joint 74LS47 decoder from the other side of resisters. 4. Use pnp transistor and connect four transistors with 4 7-segments. 5. Connect each transistor with resister (R=5Kohm or 4.7Kohm). Fig-3- Control code:

5. Fig-4-  Referance:

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Report no.3(microprocessor)

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