Drip Irrigation Kit(micro:bit): Lesson5

Lesson5 - SDG for Our Earth: Life on Land

1.Engage: UN’s SDG 15—Life on Land

Start the lesson by introducing the SDGs (Sustainable Development Goals):
The UN created 17 global goals to fix our planet’s biggest problems.

Goal 15 is about protecting land—stopping dry soil, saving plants/animals.

Key Question
What can we do to protect and restore life on land?

2.Explore: the connection between water and life on land

Complete the following activity to help students realize that water is the “blood” of land.

Activity 1
Prepare picture cards: water drop, soil, grass, rabbit, forest.
(You can find and cut out the cards from the end of the activity sheet.)
Divide students into groups and ask them to sort the cards according to "who depends on whom". Guide them to conclude the sequence:
Water drop → Soil (moistens the soil) → Grass (grows) → Rabbit (eats the grass) → Forest (the rabbit’s home).

If there were no water, what will happen?
Soil would crack and dry up → Grass would wither and die → Rabbits would starve → Forests would disappear
Show images comparing areas with sufficient water and those with water scarcity.

Summary: Water is crucial to life on land.

Key question
What can we do in our daily to save water?

3.Investigate: Smart Water Solutions

Introduce rainwater collection and drip irrigation:
Rainwater collection: Buckets or tanks that catch rain to use later.

Key Question
Which sensor tells us the water tank is full?

Drip irrigation: Thin tubes that drop water slowly near plant roots (less waste!).

Key Question
Which sensor tells us the soil is thirsty? Which part sends water when needed?

4.Design: Your Rain & Drip System

Guide students to design their own device using Micro:bit.
Sensors needed:

Activity 2
Sketch:
Students sketch their design (paper + crayons). 
Match:
Draw a line connecting each component to its correct function.
Label:
Mark the positions of the sensors/actuators.

5.Build: Let’s Assemble and Connect

Demonstrate connection:

Activity 3
Give students 2-3 minutes to connect sensors/actuators to Micro:bit.
Guide students to read the building block assembly steps in the activity sheet, and have them complete the assembly under the guidance of the sheet.
Activity 4
Give students 3-5 minutes to complete the assembly of building blocks, sensors, and actuators.

6.What next?

Preview of next class: 
1)Write programs
2)Debug
3)Test
4)decorate
5)Complete