What you'll build
Automatically water a plant when the soil is dry.
Before you start
You'll learn: How to read a sensor with analogRead() and let an if/else decide when to act.
You'll finish: A plant waterer: the pump switches on by itself only when the soil is dry.
Real world: Farms and school gardens use the same idea to save water and stop crops drying out.
Then try: Set a different threshold for spinach vs. maize, or add a light that warns when the water tank is empty.
Who does this: Agricultural technician or irrigation installer — TVET diploma in agriculture or electrical engineering, or BSc Agriculture at university.