Snap Circuits
This mini website is currently a work in progress and below are suggested and more structured lessons plans for various grade levels. The website is intended for IEEE volunteers, educators and informal instructors to provide low friction activation for both volunteers and students.
Recommended Structure for 3rd–6th Grade
Ideal Time Structure
5 minutes
WOW demo
Example:
- spinning fan
- blinking light
- sound alarm
5 minutes
Mini explanation
Very short.
Use:
- energy flow
- “electricity path”
- “closed loop”
- “light pathway”
Avoid:
- heavy terminology
15 minutes
Hands-on build
This should dominate the session.
5 minutes
Prediction challenge
“What happens if…?”
5 minutes
Show-and-tell
Students explain:
- what worked,
- what failed,
- what surprised them.
Cognitive Insight
For 3rd–6th graders:
emotion and memory are tightly linked.
So:
- excitement,
- humor,
- storytelling,
- visible success,
- peer interaction,
all dramatically improve retention.
Strongest Hidden Opportunity
Your mentorship architecture is especially powerful here.
Because older students can mentor younger students.
Example:
- high school IEEE volunteer
→ mentors middle school student
→ who mentors elementary student
That creates:
layered mentorship propagation.
And that is VERY aligned with:
- IEEE,
- KEEN,
- PPS,
- and STEAM-TEAMS.
Important Warning
Do NOT over-teach.
This is the biggest risk.
For younger students:
- explanation should support activity,
not replace activity.
A good rule:
“Hands-on time should exceed talking time.”
Preferably:
2-to-1 or 3-to-1.
STEM Activation Stack
Layer 1 — Kits
HTR Oh Snap! kits
Layer 2 — Curriculum
PhET + Snap Circuits + AI-assisted demos
Layer 3 — Mentorship
LMAG + YP + Students
Layer 4 — Documentation
mini-sites + videos + metrics
Layer 5 — Leadership
PyramidX-OS + KEEN + mentorship flywheel
That becomes a genuine replicable model.
Suggested Learning Sequence
Step 1 — Build Circuit
Students build:
- battery
- switch
- LED
Ask:
“What controls the light?”
Expected answer:
“The switch.”
Step 2 — Create Blink Patterns
Challenge:
- short blink
- long blink
Now ask:
“Can we send messages?”
This creates curiosity.
Step 3 — Introduce Morse Code
Examples:
A = dot dash
B = dash dot dot dot
Let students:
- send initials
- send names
- guess messages
Now STEM becomes interactive.
Step 4 — Transition to Digital Communication
Now say:
“Computers also send messages using patterns.”
Then introduce:
| Signal | Meaning |
|---|---|
| 1 | ON |
| 0 | OFF |
Then demonstrate:
- ON OFF ON
- OFF ON OFF
You do NOT need formal binary arithmetic.
Just:
patterns carry information.
That is the key insight.
Why This Is Powerful
You are building:
- computational thinking
- systems thinking
- signal thinking
without calling it that.
This is exactly how strong STEM experiences should work.
Even Better Extension
Team Communication Game
Split students into:
- Sender
- Receiver
Rules:
- no talking
- only light signals
This becomes:
- teamwork
- debugging
- communication engineering
Very KEEN-aligned:
- communication
- collaboration
- curiosity
- creating value
Even More Advanced (Still Kid-Friendly)
You can eventually say:
“Wi-Fi, Bluetooth, fiber optics, and the internet all send patterns too.”
That creates the:
“Whoa…”
moment.
Especially when students realize:
- YouTube
- Roblox
- Minecraft
- FaceTime
…all depend on signals and patterns.
That creates relevance.
Suggested Language for Younger Students
Instead of:
- “binary encoding”
say: - “computer light language”
Instead of:
- “digital signals”
say: - “ON/OFF messages”
This keeps cognitive load manageable.
Educational Strength of Your Approach
This progression is unusually strong because it follows:
Concrete → Abstract
Concrete
switch and LED
Semi-Abstract
blink patterns
Abstract
digital communication
That is exactly how deep learning should occur.
Excellent Follow-On Questions
After the activity:
- How fast can humans send signals?
- How fast can computers send signals?
- What happens if signals get mixed up?
- How do phones send messages without wires?
- How do satellites communicate?
- How does Morse compare to texting?
Now you are building engineering curiosity.
Download Slides: These slides are courtesy of Annie Dai.
“The Secret Light Between Two Windows”
A STEM Story About Friendship, Signals, and the Beginning of Digital Communication
Scene 1 — The Stormy Night
On a cool Friday evening, two neighboring kids sat in their bedrooms staring out their windows.
On the left side of the street was Ethan.
On the right side was Maya.Both loved building things.
Both loved solving puzzles.
And both had just finished building a simple LED circuit with:
- a battery,
- a switch,
- and a glowing light.
Earlier that day at their STEM club, their mentor had said:
“Engineers don’t just build circuits…
they build ways to communicate.”Ethan looked at his blinking LED and wondered:
“Can a light become a language?”
At the exact same moment, Maya had the same idea.
Scene 2 — The First Signal
Ethan carefully clicked his switch:
Blink…
Blink Blink…Across the street, Maya noticed the flashing light in Ethan’s bedroom window.
She smiled.
Then she flashed her own LED back.
Blink Blink…
Blink…Ethan nearly jumped out of his chair.
“She saw it!”
The two kids started experimenting:
- short blinks,
- long blinks,
- fast signals,
- slow signals.
Soon they created a simple game:
- one blink = YES
- two blinks = NO
Without using phones…
Without shouting…
Without Wi-Fi…They were communicating using electricity and light.
Scene 3 — The Secret Code
The next day, Ethan brought a small notebook to Maya’s house.
On the front he wrote:
“SECRET LIGHT LANGUAGE”
Inside were symbols:
Signal Meaning • short blink — long blink Maya gasped.
“This looks like a spy code!”
Ethan grinned.
“It’s called Morse code.”
Together they learned:
- A = • —
- B = — • • •
- H = • • • •
- E = •
That night, the two kids sat by their windows sending messages through the darkness.
Blink blink blink blink…
Blink…Maya decoded it immediately.
“HE!”
Then Ethan finished the message:
• • • •
•
• — • •
• — • •“H… E… L… L…”
Maya laughed.
“HELLO!”
The two friends cheered across the street.
Scene 4 — The Big Discovery
The next week, their STEM mentor visited.
The kids proudly demonstrated their flashing LED communication system.
The mentor smiled and asked:
“Do you know what computers do?”
Maya shrugged.
Ethan guessed:
“Math?”
The mentor nodded.
“Yes… but computers also communicate using ON and OFF signals.”
He pointed to the LED.
ON = 1
OFF = 0
The kids stared at the blinking light.
The mentor continued:
“Every video game…
every text message…
every YouTube video…
every satellite signal…
begins with tiny ON and OFF patterns.”Ethan’s eyes widened.
Maya whispered:
“So computers are blinking really fast?”
The mentor laughed.
“Exactly.”
Scene 5 — The Signal Challenge
The next STEM club meeting became a giant communication game.
Teams competed to:
- send messages,
- decode signals,
- and build faster blinking systems.
One team used flashlights.
Another used LEDs.
Another tried colored lights.Soon the classroom looked like a tiny digital city full of:
- glowing signals,
- laughing students,
- and blinking inventions.
The mentor stood quietly in the back of the room smiling.
Because something important had happened.
The students were no longer just using technology.
They were beginning to think like engineers.
Scene 6 — The Bigger Meaning
That night, Ethan looked out his window again.
Maya blinked her LED one time.
Blink.
Ethan blinked back.
Blink.
No words were needed.
Because now they understood something powerful:
A simple circuit can carry an idea.
A blinking light can carry meaning.
And curiosity can spark innovation.Far above them, satellites silently flashed signals through space.
Fiber optic cables carried pulses of light beneath oceans.
Computers exchanged billions of ON/OFF signals every second.
And it all connected back to:
- one battery,
- one switch,
- one LED,
- and two curious kids.
STEM Lessons Hidden Inside the Story
Students Learn:
- Basic circuits
- Switches and control
- LEDs
- Morse code
- Binary thinking
- Digital communication
- Pattern recognition
- Teamwork
- Problem-solving
Moral of the Story
Big technologies often begin with small experiments.
And sometimes…
The future of digital communication starts with two kids,
two blinking lights,
and a little curiosity.
Building an LED Circuit
Download visual description of diodes
SnapCircuit_IEEE_STEM_HTHH_LessonPack: Courtesy of Annie Dai Wei from the Houston Section
[Ext] Oh Snap! Student Lesson Feedback Form (doc): [Ext] Oh Snap! Student Lesson Feedback Form (pdf)
- Courtesy of Annie Dai Wei from the Houston Section. You may need to simplify the feedback form and answer some of the questions for the younger kids (3rd-4th graders)
After building a snap led circuit with a simple switch, a simple application is Morse communication (1s and 0s) which naturally leads to digital communication with 1s and 0s.
Here is the intended and natural progression:
- Physical circuit
→ “The light turns on.” - Control
→ “The switch controls the signal.” - Patterns
→ “Different blink patterns carry meaning.” - Communication
→ “We can send messages with electricity.” - Digital thinking
→ “Computers also use ON and OFF patterns.”
That is an extremely intuitive pathway.
Why This Works So Well
Children already understand:
- flashlight blinking
- walkie-talkies
- texting
- emojis
- game controllers
- traffic lights
So Morse code becomes:
“Sending secret flashlight messages.”
That feels like play, not theory.
And this one form of STEM pedagogy.
The Hidden Strength of This Lesson
Here, we intend to quietly teach:
- circuits
- switches
- logic
- encoding
- communication systems
- abstraction
- information theory foundations
…without overwhelming them.
This is an intended and rather sophisticated educational design.
Now introduce:
- binary
- digital communication
- computers using ON/OFF states
- “electricity carrying information”
This age group can absolutely grasp:
- 1 = ON
- 0 = OFF
Especially visually.
Building an LED circuit
You can also build a circuit with Squishy Circuits (Play-doh) first then build one with Snap Circuits.
Grades 3–4
Focus on:
blinking patterns
simple letters
teamwork
“secret codes”
Avoid:
binary terminology initially
Use phrases like:
ON/OFF signals
blink patterns
light messagesp>
Now introduce:
- binary
- digital communication
- computers using ON/OFF states
- “electricity carrying information”
This age group can absolutely grasp:
- 1 = ON
- 0 = OFF
Especially visually.
3rd Grade Reflection Questions
Focus:
- curiosity,
- observation,
- simple communication,
- and excitement.
Questions
- What happened when you pressed the switch on your circuit?
- How did the blinking light help send a message?
- What was the easiest part of building your circuit?
- What surprised you most during the activity?
- If you could send a secret light message to a friend, what would it say?
4th Grade Reflection Questions
Focus:
- patterns,
- teamwork,
- problem-solving,
- and signal thinking.
Questions
- How did your team use blinking patterns to communicate?
- Why do you think engineers use signals and codes?
- What happened when the signal was confusing or incorrect?
- How did working with a partner help you solve problems?
- Where do you think people use light or signals in real life?
5th Grade Reflection Questions
Focus:
- digital communication,
- systems thinking,
- and engineering applications.
Questions
- How are Morse code and computer signals similar?
- Why do computers use ON and OFF patterns?
- What real-world technologies use signals like the ones you created?
- What challenges did your team face while sending or decoding messages?
- How could engineers improve communication systems to make them faster or clearer?
6th Grade Reflection Questions
Focus:
- abstraction,
- digital systems,
- engineering design,
- and future thinking.
Questions
- How does a simple LED circuit connect to larger communication systems like the internet or satellites?
- Why is it important for communication systems to use agreed-upon rules or codes?
- How does debugging help engineers improve communication systems?
- What careers or technologies rely on digital communication and signal processing?
- If you designed your own communication system, what features would you add and why?
Below is a virtual and PhET simulation students can practice at home. We can also show them how to build an actual circuits in class.
You can say the lightbulb is in place of the LED but the lightbulb allows electricity to flow in both directions.
The simulation of a multimeter (voltmeter) . You can use voltmeters to check good or bad batteries. Using a multimeter, you can check to see if a switch is on or off as well as checking which wires are connected if you have a set of wires and then connect a pair of wires.
For curious students who want to reader more about semiconductors, like LEDs (Light Emitting Diodes), check out the ebook below from IEEE TryEngineering.