Computer Science
Grade 3
20 min
Binary and Light: Simulating Computer Signals
Students will use flashlights to simulate binary signals and transmit simple messages.
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Introduction & Learning Objectives
Learning Objectives
Explain that computers use a special language called binary.
Identify that binary uses only two symbols: 0 and 1.
Connect the concept of 'On' and 'Off' with light to the binary digits 1 and 0.
Translate a simple sequence of 'On' and 'Off' lights into a binary code.
Decode a simple binary code into a sequence of 'On' and 'Off' lights.
Create their own simple patterns using binary to represent ideas.
How can a giant computer or a tiny phone understand your commands using just a light switch that's either ON or OFF? 🤔💡
Today, we're going to become computer detectives and learn the secret language of computers, called binary! We will discover how simple 'On' and 'Off'...
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Key Concepts & Vocabulary
TermDefinitionExample
BinaryA special language that computers use which has only two 'letters' or symbols: 0 and 1.Instead of saying 'hello', a computer might use a pattern of 0s and 1s like '01001000 01100101'.
BitThe smallest piece of information a computer can understand. A bit is either a single 0 or a single 1.In the code '101', the '1' is one bit, the '0' is another bit, and the last '1' is a third bit. There are 3 bits in total.
SignalA message sent using electricity. For computers, the signal can be either 'On' or 'Off'.Flipping a light switch sends a signal. When the light is on, it's an 'On' signal. When it's off, it's an 'Off' signal.
DataAny information...
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Core Syntax & Patterns
The 'On' Signal Rule
1 = ON
Whenever you see the number 1 in binary code, it means a signal is ON. Think of a light bulb being turned on.
The 'Off' Signal Rule
0 = OFF
Whenever you see the number 0 in binary code, it means a signal is OFF. Think of a light bulb being turned off.
The Pattern Rule
Patterns of 0s and 1s represent bigger ideas.
By putting 0s and 1s together in a line, we can create codes that stand for letters, numbers, colors, and more.
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Challenging
You want to create unique light signals for 5 different robot commands ('forward', 'back', 'left', 'right', 'stop'). What is the FEWEST number of lights you need to use?
A.2 lights
B.3 lights
C.4 lights
D.5 lights
Challenging
Imagine a computer that uses a special light with three states: OFF (code 0), DIM (code 1), and BRIGHT (code 2). Is this a binary system?
A.Yes, because it uses lights and codes.
B.Yes, because it includes 0 and 1.
C.No, because binary must have exactly two states.
D.No, because computers cannot make lights dim.
Challenging
A friend creates a 'reverse' binary code where a light ON means 0 and a light OFF means 1. They send you this signal: ON, OFF, ON. What would this code be in standard binary (where ON=1, OFF=0)?
A.101
B.010
C.110
D.001
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