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Circuit Operation

The LDR senses changes in light intensity. When it’s dark, its resistance increases, causing the
transistor to turn on. This allows current to flow through the LED, illuminating the street light.

Concepts

Components of a Circuit: Learning about light-dependent resistors (LDRs), LEDs, and transistors.

Simple Circuits: Designing circuits that turn on lights based on environmental conditions (light
levels).
Sensor Integration: Understanding how LDRs function and their role in detecting light levels.

Real-World Applications: Exploring the use of sensors in smart technology and their benefits to
society.

Observations

In the “Automatic Street Light” activity using a breadboard, students will observe how the light
turns on automatically when it gets dark and turns off when it’s light. By using a light-dependent
resistor (LDR), they can see how it detects changes in light levels. When the LDR is covered or in low
light, the LED lights up, demonstrating the circuit’s response to the environment. If the LED doesn’t
function as expected, students can check their connections and ensure the LDR is placed correctly.
This activity teaches them about sensors, circuits, and automation!

Applications

Home automation: LDR-based circuits can be integrated into
home automation systems
to control indoor and
outdoor lighting based on
natural light conditions.

Garden lighting: Outdoor Garden lights can utilize LDR sensors
to automatically illuminate during dusk and dim or turn off during
daylight hours, enhancing aesthetics and safety.

26 RoboGenius (V1.0)-VII