SPIKE™ Essential

Communicate with Light and Sound

Daniel lives across the street from Sofie. What can he build to send messages to her?

45-90 min.
Year 2-6


(NOTE: This lesson contains a Part A and a Part B. Both are important to access the full learning of the curriculum. If time is limited, review both parts to choose elements that meet your pupils’ needs.)

In this lesson, the key learning is to design and build a messaging device that uses light or sound to communicate over a distance. Pupils will design their own light or sound message codes and then create a model device as a fun, hands-on way to test those codes. The lesson provides both code suggestions and building/programming examples for inspiration. Encourage pupils to design their own message codes and devices.

  • Science Background - Communicate with Light or Sound: Long-distance communication solutions are as old as human history.
    • Ancient cultures used drums, runners with verbal messages, couriers carrying messages recorded in clay or on papyrus and smoke signals.
    • Later, flags, mirrors and semaphores were used to communicate with codes.
    • Since the nineteenth century, electrical devices (telegraph, telephone, radio, satellites and the internet) have increased the distances people can send and receive messages, including around the world and deep into space.
  • Build Prior Knowledge - Communicate with Light or Sound: Using your core science and maths materials, share information, images and definitions.
    • Numerals (such as 1 through 20) represent quantities that can be counted.
    • People use sound and light in their daily lives when they speak, use digital devices, use electronic alarms, turn lamps on and off, etc.
    • Key vocabulary: code, communicate.
  • Building and Programming Experience: Review the suggestions in the Unit Plan. For this lesson, you may also want to
    • Reinforce with the Light tutorial in the SPIKE App Start menu.
    • Use the Event, Sound and Light Blocks sections of the Help>Icon Blocks menu in the SPIKE App to build knowledge of ways to program with sound and light to send messages.
    • Use the Musical Vibration lesson to build experience with designing devices that create sound.
  • Materials: Locate images of lighthouses and traffic lights if needed to support pupils’ background building.

PART A (45 minutes)


(Whole Class, 10 minutes)

  • Introduce the story’s main character(s) and the first challenge: Daniel lives across the street from Sofie. What can he build to send messages to her?

  • THINK – Facilitate a brief discussion about the lesson topic(s), using the story picture if you wish.

    • Suppose you want to talk to someone who isn’t nearby. Try to send a message to someone across the room. But don’t talk. (Guide pupils towards thinking about the fact that we might need to communicate using a light or sound effect.)
    • What if they’re not in the room? Then what could you do? (Telephone, video call, emails)
    • What are some ways people use light to send messages? (You may want to show images to support knowledge building, including lighthouses flashing to guide people on boats away from danger or car indicator lights flashing to signal if a car is about to turn left or right).
    • Let’s think about the problem Daniel has. What questions do you have about it? How can we help him solve his problem? (Pupils may have questions about whether Daniel’s and Sofie’s windows are open or closed, if the solution should work in daytime or nighttime, etc.)
  • Distribute a LEGO® Education SPIKE Essential Set and a device to each group.


(Small Groups, 25 minutes)

  • As pupils work, consider sharing the example ideas below as support for building or programming. Clarify that it’s an example idea. Pupils should build and program the device they designed.

  • Have pupils:

    • Discuss Daniel’s problem and ways to solve it.
    • Plan some ways to use light as a code for messages. Write them down (Support pupils with examples, such as flash once = yes; flash twice = no; flash three times = don’t know).
    • Use the base model to DESIGN and BUILD a device that can communicate by flashing lights, starting by sketching to explore their ideas.
    • PROGRAM the device so it can send messages with the light codes they planned.
  • Facilitate brainstorming about ways to use the SPIKE Essential Set to support design ideas, such as:

    • By having pupils choose which set elements are most important for communicating with light (the Light Matrix and sensors).
    • How to program the light to change colours for more interesting codes (e.g., flash red once = happy; flash blue once = sad).
  • Encourage pupils to iterate the model until it works as they expect.

  • Halfway through work time, have pupils exchange ideas using a familiar classroom routine and then update their models with inspiration from sharing.

Example Ideas

SPIKE Essential Communicate with Light and Sound - en


(Whole Class, 10 minutes)

  • Gather pupils for sharing.

  • Have each group use their model and design plans to demonstrate and explain:

    • Their design idea and why they chose it.
    • How their device helps communicate across distances.
    • The hardest part of solving the problem.
    • If their design worked or they had to change it.
    • What code they created.

If you wish to continue in Part B – Explain, have pupils keep their models intact or allow time for rebuilding.

PART B (45 minutes)


(Whole Class, 10 minutes)

  • Repeat the steps from Part A – Explain to have additional groups demonstrate and explain their learning.


(Whole Class, 25 minutes)

  • (5 min) Share background to help pupils Elaborate:

    • In addition to light, people use sound to send signals in daily life.
    • What are some examples? What messages do they send? (fire alarms, sirens from police cars or ambulances, ring tones from phones and doorbells; these sounds mostly tell people to pay attention and sometimes to alert them to a dangerous situation.)
    • Encourage pupils to explain more sound signals in daily life. Then briefly facilitate brainstorming about ways to use the three Sound Blocks in the SPIKE App.
    • Ask: What sounds can you use? (See SPIKE App>Help menu>Icon Blocks for answers.)
  • (15 min) Have your pupils iterate and test their models to complete the next challenge in the app:

    • Plan some ways to use sound as a code for messages. Write them down. (Support pupils with examples such as clapping hands sound = happy; dog barking = would like to play).
    • Design and build a device that makes sounds. Program it to use the sounds to send coded messages. (See Prepare for reference to the Musical Vibration lesson, which may support pupils.)
  • (5 min) Invite pupils to share knowledge, ideas or skills that:

    • Helped them complete the challenge.
    • They learned while building.
  • Have pupils clean up the sets and work areas.


(Whole Class, 10 minutes)

  • Ask guiding questions to elicit pupils’ thinking and their decisions while developing ideas, building and programming.

Observation Checklist

  • Review the learning objectives (Teacher Support box).
  • Use the checklist to observe pupils’ progress:
    • They can develop their own codes using sound and light.
    • They can design, build and describe the features of devices that use light and sound (codes) to solve the problem of communicating over a distance.
    • They can iterate their devices until they work as they expect.


Have each pupil choose the brick that they feel best represents their performance。

  • Blue brick: I think I can follow instructions to create a program.
  • Yellow brick: I can follow instructions to create a program.
  • Green brick: I can follow instructions to create a program, and I can help a friend do it too.

Peer Feedback

In their small groups, have your pupils discuss their experiences working together.
Encourage them to use statements like these:

  • I liked it when you…
  • I’d like to hear more about how you…


Simplify this lesson by:

  • Suggesting a simple code (e.g. flash once = yes; flash twice = no; flash three times = don’t know; A = 1, B = 2; clapping hands sound = happy; dog barking = would like to play) to help pupils move quickly to designing their device. If pupils are stuck, use the provided examples under Explore to prompt thinking.

Increase the difficulty by:

  • Organising groups of four and challenging them to design devices that combine light and sound to communicate across a distance.

Cross-curricular Learning

  • Have pupils write and draw the codes they created for Explore and Elaborate on flashcards. Have them use colours, numbers, pictures and sound words (e.g., “bark”) to make the flashcards. Encourage them to share the flashcards with their friends and family to explain how their codes can be used to communicate.

If facilitated, this will extend beyond the 45-minute lesson.

Teacher Support

Pupils will:

  • Design and build devices to communicate over a distance, one using light and one using sound.
  • Describe specific features of each design idea.
  • Explain how they tested their ideas and improved their designs.

(one for every two pupils)

  • LEGO® Education SPIKE Essential Set
  • Device with the LEGO Education SPIKE App installed
  • See Prepare - Materials

Year 3 Light

Year 4 Sound

English cross-curricular learning

Spoken Language

Pupil Material

Student Worksheet

Download, view or share as an online HTML page or a printable PDF.