ET220 : Module 1 Introduction to Digital Technology

ET1220: Module 1 Introduction to Digital Technology

Lab 1.1

Lab Report

Name:

Date:

Grade:

Instructions:

· Complete Part 1, then Part 2 sections of the Lab 1.1. Then, complete this Lab Report by filling in all details. Use information you gained during your experimentation to complete the answers.

· Be sure to submit your lab report before the deadline.

Part 1- Binary-to-Decimal Number Conversion

Theory:

1. Enter the decimal, hexadecimal, and BCD numbers for each of the following binary numbers.

Binary	Hexadecimal	BCD	Decimal
0000	0	0000	0
0001	1	0001	1
0010	2	0010	2
0011	3	0011	3
0100	4	0100	4
0101	5	0101	5
0110	6	0110	6
0111	7	0111	7
1000	8	1000	8
1001	9	1001	9
1010	A	Invalid	10
1011	B	Invalid	11
1100	C	Invalid	12
1101	D	Invalid	13
1110	E	Invalid	14
1111	F	Invalid	15

2. Explain major differences between binary and BCD numeric representations.

Ans 2:

BCD each digit of a decimal number is coded as a 4 bit binary number between 0 and 9. This is not used too often as it is difficult to do calculations in BCD as opposed to binary, and it is not efficient – uses more bits than a binary coded number would. 

In Binary the number is converted to base 2, binary code. 

Planning:

1. Provide a list of places that you can obtain the datasheets for the following components:

· SN74LS47 Binary to BCD Decoder

http://www.onsemi.com/pub_link/Collateral/SN74LS47-D.PDF

· MAN72 Seven Segment Display

http://web.ece.ucdavis.edu/~bbaas/180a/Datasheets/man72a.pdf

· 4116R 1-331 330 ohm Resistor Pack

http://www.digchip.com/datasheets/parts/datasheet/1896/4116R-1-331-pdf.php

Preparation:

2. Why is it important to follow ESD safety procedures when handling electronic components? What are some of the main considerations?

Ans2

These precautions protect sensitive electronic components

Extremely fast response time

Low clamping and operating voltage

Capacity of handle high peak ESD current

Ability to remain undamaged by repetitive ESD strikes

Minimize size

Minimal reverse leakage current

Wiring Procedure:

3. Complete the wiring diagram. Refer to Lab 1.1 Figure 1-4 and image 1 & 2 of the ET1220.U1.Lab.Images PowerPoint. Use MS Paint to complete the wiring diagram.

Test Procedure:

4. Record the observed values from Lab 1.1 Table 1-1. Indicate which segments are illuminated for each input setting.

Inputs	Output
Binary Data Lines	BCD Number	Seven Segment Display
3	2	1	0
0	0	0	0	0000
0	0	0	1	0001
0	0	1	0	0010
0	0	1	1	0011
0	1	0	0	0100
0	1	0	1	0101
0	1	1	0	0110
0	1	1	1	0111
1	0	0	0	1000
1	0	0	1	1001
1	0	1	0	Invalid
1	0	1	1	Invalid
1	1	0	0	Invalid
1	1	0	1	Invalid
1	1	1	0	Invalid
1	1	1	1	Invalid

Troubleshooting:

5. For each trouble investigated, record your observations from Lab 1.1 Table 1-2.

Trouble	Trouble	Observations
1	LED for the C segment is open. Break the connection to pin C of the 7-segment display (remove the wire).	Accept 2 All output will be wrong
2	An input to the 7447 is open. Break the connection to the input A pin of the 7447 (remove the wire).	Odd numbers will not display
3	1000 ohm resistor is open. (Remove the 1kΩ resistor).	Output will be blank

6. Assume that the switches are set to a binary 1000 value, but the display shows a zero. What are three possible causes for this error?

Ans6:

1. The input D pin of the 7447 is open .

2. LED for the f segment is open.

3. Power supply to switch is open .

Part 2- Binary-Number Addition and Two’s Complement Subtraction

Theory:

9. Provide the results for the half-adder truth table.

	A0	+	B0	S1S0
	0	+	0	00
	0	+	1	01
	1	+	0	01
	1	+	1	10

10. Provide the results for the full-adder truth table.

	A0	+	B0	+	Cin	CoutS
	0	+	0	+	0	00
	1	+	0	+	0	01
	0	+	1	+	0	01
	0	+	0	+	1	01
	1	+	1	+	0	10
	1	+	0	+	1	10
	0	+	1	+	1	10
	1	+	1	+	1	11

Planning:

11. Provide a list of places (links) where you can obtain the datasheets for the following components:

· 74LS08 Quad AND Gate

http://www.cs.smith.edu/~thiebaut/270/datasheets/sn74ls08rev5.pdf

· 74LS32 Quad OR Gate

http://www.cs.smith.edu/~thiebaut/270/datasheets/sn74ls32rev5.pdf

· 74LC86 Quad XOR Gate

https://courses.cs.washington.edu/courses/cse477/99au/assignments/lab2/74ls86.pdf

Preparation:

12. What are several important things you should consider before wiring your circuit?

Answer :

1. Make sure that the power supply is switch off

2. Test the wire

3. Test your ICs

4. Draw the rough sketch with ICs PIN number before actual connection to avoid any confusion while wiring circuit on breadboard

Wiring Procedure:

13. Complete the adder wiring diagram. Refer to Lab 1.1 Figure 1-12 and image 10 of the ET1220.U1.Lab.Images PowerPoint. Use MS Paint to complete the wiring diagram.

Test Procedure:

14. Record the observed values from Lab 1.1 Table 1-3.

Switch		Switch
4	3	Decimal Value of B	2	1	Decimal Value of A
B1	B0		A1	A0		Calculated Sum	7-Segment Display
0	0	0	0	0	0	0	0
0	0	0	0	1	1	1	1
0	0	0	1	0	2	2	2
0	0	0	1	1	3	3	3
0	1	1	0	0	0	1	1
0	1	1	0	1	1	2	2
0	1	1	1	0	2	3	3
0	1	1	1	1	3	4	4
1	0	2	0	0	0	2	2
1	0	2	0	1	1	3	3
1	0	2	1	0	2	4	4
1	0	2	1	1	3	5	5
1	1	3	0	0	0	3	3
1	1	3	0	1	1	4	4
1	1	3	1	0	2	5	5
1	1	3	1	1	3	6	6

4