A simple, analog street lighting system that automatically turns lights ON at night and OFF during daylight using an LDR-based sensing mechanism. Built entirely using analog components (no microcontroller or code), the project showcases the use of voltage dividers, comparators, and relay-based switching.
- Lights turn ON automatically when ambient light is low (night)
- Lights turn OFF when sunlight is sufficient (day)
- Built with only analog components — no coding required
- Energy-efficient, cost-effective solution for rural or small-scale implementations
| Component | Purpose |
|---|---|
| LDR (Light Dependent Resistor) | Detects ambient light level |
| LM358 Comparator (Op-Amp) | Compares voltage from LDR with reference threshold |
| Relay Module / Transistor | Switches high-voltage light ON/OFF |
| Resistors / Potentiometer | Sets sensitivity and threshold levels |
| Power Supply (5V/12V) | Powers the analog logic and relay coil |
| Breadboard / PCB | Circuit assembly and testing platform |
The schematic illustrates the voltage divider formed by the LDR and fixed resistor, feeding into a comparator that toggles the relay.
- Analog sensing and threshold switching
- Comparator-based decision logic (LM358)
- Use of relays/transistors to control AC/DC loads
- Real-world application of LDR-based control systems
This project is licensed under the MIT License.
Developed by Siddharth Singh
Part of core electrical project showcase for energy-efficient automation.