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Smart Germination Monitoring Station

Source:

Sprout seeds in a clear container with a soil moisture sensor and light sensor. The micro:bit displays a smiley when conditions are good and a sad face when the plant needs water.

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Props & Materials Required

  • •Clear ziplock bag or clear plastic cup
  • •Cotton balls or paper towels
  • •Moong/rajma seeds (soaked overnight)
  • •Water spray bottle
  • •Magnifying glass & observation diary

Step-by-Step Instructions

1

Prepare the Sprout Station

Moisten cotton balls, place 3-4 soaked moong seeds, and position the soil moisture sensor probe in the cotton.

2

Check the Smart Display

The micro:bit shows a smiley face (😊) when moisture is good. When the cotton dries out, it shows a sad face (😢) and the speaker says: 'Your plant is thirsty! Please spray water!'

3

Daily Observation

Day 2: Root emerges! Day 4: Green shoot appears! Day 6: Tiny leaves unfold! The light sensor confirms the plant is getting enough sunlight.

4

Growth Diary with Data

Record daily drawings AND sensor readings (moisture level, light level) in the sprout diary. Compare: 'Day 3 was cloudy (low light) — the shoot grew slower!'

Why It Works & Notes

Soil hides root growth. A transparent container lets children witness germination while smart sensors teach them that plants need measurable amounts of water and light — turning care into data-driven observation.