Overview
Students built a circuit that mirrors real street lighting systems — the LDR detects ambient light and the transistor switches the LED on or off accordingly. No code, no Arduino — pure analog electronics.
Topics
Sensors and real-world automation applications
Transistors as electronic switches
LDR — detecting light intensity changes
How real street lights work
Activities
Assembled LDR + transistor + LED + battery circuit
Tested under different light levels
Covered LDR to simulate night — observed LED turn on
Troubleshot and refined connections independently
Photos
Highlights
- Students explained the circuit independently after assembly
- Testing under different light made automation click instantly
- Strong engagement and curiosity throughout
- Real street light application — students saw the direct relevance