01
![U1L4_Engage.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt2703b8f6db9547a7/62b967e729e2dd0ff591b68a/U1L4_Engage.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Daniel lives across the street from Sofie. What can he build to send messages to her?
02
![Explore_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blte2bc585a3ed49a48/62710f0976b17f2f94787491/Explore_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Find someone across the room.
Try to send a message.
But don’t talk!
03
![Explore_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blte2bc585a3ed49a48/62710f0976b17f2f94787491/Explore_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
What if they’re not in the room?
Then what could you do?
04
![Explore_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blte2bc585a3ed49a48/62710f0976b17f2f94787491/Explore_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
What are some ways people use light to send messages?
05
![Explore_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blte2bc585a3ed49a48/62710f0976b17f2f94787491/Explore_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Discuss Daniel’s problem.
Find some ways to use light as a code for messages.
06
![Explore_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blte2bc585a3ed49a48/62710f0976b17f2f94787491/Explore_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Write them down.
(For example, flash once = yes; flash twice = no; flash three times = I don’t know.)
07
![45345_Science_U1_L3_App_Overlay.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blta90af75ecae3a198/62ac4644c4d59b57e0c26536/45345_Science_U1_L3_App_Overlay.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Design a device that sends a message by flashing lights.
08
Program your device to send messages.
Use the light codes you planned.
09
![Explain_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt159154305e2aa4ee/62710efe76b17f2f9478748d/Explain_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Explain:
What is your design idea?
How does your device help send messages across distances?
10
![Explain_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt159154305e2aa4ee/62710efe76b17f2f9478748d/Explain_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Explain:
What was the hardest part of solving the problem?
Did your design work? Did you change it?
11
![Explain_Daniel.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt159154305e2aa4ee/62710efe76b17f2f9478748d/Explain_Daniel.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Explain:
What message code did you create?
12
![Elaborate_Daniel-Leo.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt31a9a0dfc38405b3/629470a4a3e9730f695ce186/Elaborate_Daniel-Leo.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Now plan some ways to use sound as a code for messages.
13
![Elaborate_Daniel-Leo.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt31a9a0dfc38405b3/629470a4a3e9730f695ce186/Elaborate_Daniel-Leo.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Write them down.
(For example, clapping hands sound = happy; dog barking = would like to play.)
14
![Elaborate_Daniel-Leo.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt31a9a0dfc38405b3/629470a4a3e9730f695ce186/Elaborate_Daniel-Leo.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Design a device that makes sounds.
Then build it.
15
![Elaborate_Daniel-Leo.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt31a9a0dfc38405b3/629470a4a3e9730f695ce186/Elaborate_Daniel-Leo.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Program it to use the sounds to send coded messages.
16
![GslastEssentialMinifig.518563b8.png](https://assets.education.lego.com/v3/assets/blt293eea581807678a/blt8a54880687149983/62710efefbd1dd35f419cee2/GslastEssentialMinifig.518563b8.png?locale=en-au&auto=webp&format=jpeg&width=1800&quality=90&fit=bounds)
Great job!