Overview
The most complex build in the programme so far — students assembled a working automatic water dispenser. An IR sensor detects a hand, the transistor switches on, and the pump activates. It mirrors the logic of touchless dispensers found in hospitals and public spaces.
Topics
Sensor-based automation — input to output
IR sensor for hand and motion detection
Transistors as switches for larger loads
DC pumps — controlling motors with transistors
Activities
Assembled full circuit — IR sensor, transistor, pump, power
Tested by waving hand at different distances
Troubleshot connections and refined circuit as a team
Explained each component's role independently
Photos
Highlights
- Students explained each component's role without prompting
- Pump activating from a hand wave — the highlight of the programme
- Strong problem-solving and collaboration during assembly
- Direct link to hospitals and hygiene — real-world impact understood