Lab 3 1
Lab 3: Simplifying digital circuits using Boolean alge
a rules (200 pts)
Learning Objectives:
1. Familiarize yourself with constructing basic logic circuits on a
eadboard
2. Practice using Tinkercad to simulate circuits
3. Explore different methods of simplifying a circuit using Boolean alge
a rules
Concepts to Practice and Learn:
• Building virtual circuits on TinkerCAD and real circuits on Breadboard
• Simplifying circuits using Boolean alge
a rules
• Converting a wording deign problem into a truth table
This table lists deliverables for Lab 1. Please Print out and use to check off the tasks as you complete them by your
instructo
TA.
Step No. and Description
Completed
successfully
Comments or questions
Pre-Lab (100 pts)
TinkerCAD circuit (40 pts) – part of pre-lab
Breadboard circuit (70 pts)
Reflection Questions (30 pts)
Show your Tinkercad and
eadboard circuits to the TA to verify:
• Co
ect logic ICs used
• Co
ect, neat wiring
• Verify functionality
Student Name :_____________________ XXXXXXXXXXID@__________________
TA: ___________________________ XXXXXXXXXXDate: ___________
Lab 3 2
Pre-Lab 3: (100 points)
Circuit: Temperature Range detector
This circuit is a system that indicates whether water temperature is too cold, too hot, or just right, based on a 3-bit
digital temperature reading. The relationship between the digital values for temperature and their co
esponding
decimal values are shown:
The 3-bit digital
temperature
Decimal value
for
Temperature A B C
0 0 0 0
0 0 1 1
0 1 0 2
0 1 1 3
1 0 0 4
1 0 1 5
1 1 0 6
1 1 1 7
Design a digital logic circuit that has three inputs (A, B, and C) for measuring the temperature and three outputs for
indicating one of the following (Too cold, Just Right, too hot) based on the conditions mentioned in the circuit
description.
3.1 Fill in the truth table according to the circuit description. (25 pts)
A B C Too cold Just
Right
Too hot
Circuit Description:
IF the decimal value is 0, 1, or 2 then turn
ON only the “Too Cold indicator”.
IF the decimal value is 3 or 4, turn ON only
the “Just Right indicator”.
If the decimal value is 5, 6, or 7 then turn ON
the “Too Hot indicator”.
3
3
Lab 3 3
3.2 For each output, find the sum of minterms that will formulate the Boolean expression of the output. Then,
check if the Boolean equation can be simplified more or not. If yes, simplify it using Boolean alge
a rules to
the simplest form. (20 pts)
The Boolean expression for the output
using the minterms
Can it be
simplified
more?
Y/N
If yes, simplify using Boolean alge
a rules
tooCold =
justRight=
tooHot=
Lab 3 4
3.3 Draw the circuit diagram for each output using your most simplified form. (15 pts)
3.4 Build the circuit with three outputs (tooCold, justRight, and tooHot)connected to three different LEDs using
TinkerCAD and verify the operation of your circuit. Save the circuit as “Lab3_Circuit” (40 pts)
Lab 3 5
Lab XXXXXXXXXXpoints):
During lab, you will implement the complete circuit that will have three inputs and three outputs. Use the simplified
circuit design that you came up with in your prelab. (70 pts)
Verify the operation of the complete circuit with your instructo
TA.
Reflection Questions:
[1] Write the name and/or expression of each boolean alge
a simplifiaction rule that you used to simpllify your
output equations in the pre-lab. (5 pts)
[2] Draw an alternative Circuit diagram for each output circuit using NAND gates only. Use schematic
simplification rules whenever it is applied. Notice that your drawing has to be very neat, clean and clear .Otherwise,
you will not receive a grade for this part. (20 pts)
[3] Please, answer the following question from your lab 3 experience: (5 pts)
(I) What went well for you during this lab? What was easy for you?
(II) What was most challenging for you in this lab?
XXXXXXXXXXIII) How did you overcome the challenge and/or what did you learn through it?