• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar
  • Skip to footer
Circuits Gallery

Circuits Gallery

All about Electronics and Circuits

  • Home
  • Basics
    • Components
    • Wiring
    • Circuitry
    • Oscilloscope
    • Conductivity
  • Project
    • Using 555 Timer
    • Using Op-Amp
  • MicroController
    • PIC
  • Arduino
  • Simulation
  • Digital
  • Communication
  • How To
  • About Us

Street Light Circuit | Automatic Brightness Detection Lighting System

April 20, 2022 by Charles Clark Leave a Comment

Street lights are very useful devices. They provide light automatically during the night. Street LED lights use LEDs instead of incandescent lamps. Here is the simple circuit for street lightning. The solar street light is the advanced version of the ordinary street light.

Street Light Circuit Diagram

Components Required for Street Light Circuit

  1. Rectifier (Step Down Transformer, Diodes-4, Capacitor-470μF)
  2. LDR (Light Depended Resistor)
  3. Resistors (56KΩ,100Ω)
  4. Transistor BC187 (2)
  5. 6V or 12V Relay
  6. Bulb

Working Principle of Street Light Circuit

  • The bulb is Off during day time and it turns on automatically at night
  • The unique property of LDR (Light Depended Resistor) is utilized here
  • LDR is a variable resistor. It has very low resistance in the presence of light and very high resistance in the absence of light
  • In this circuit, we have created a potential divider with 1 arm is an ordinary resistor and another arm being an LDR
  • As we know that voltage drop across a resistor increases when resistance increases
  • Here the drop across the LDR varies as light intensity changes That are voltage drop across the LDS is minimum in the Light and maximum in the absence of light
  • The drop across the LDR is connected to the Base of the BC 187 transistor In the dark, the drop is very high (> 0.6V) and it is sufficient to turn on the transistor
  • When 1st transistor is On next one will also turn on when the relay coil energizes and the bulb will glow
  • In the Light, the drop is very small (< 0.6V), then the transistor remains in the off state

Components Pinout

Pinouts of Relay
Photo and circuit symbol of LDR

Conclusion

You can use this street light circuit in places where uninterrupted lighting is required. A lot of bigger projects may harness its capability.

Filed Under: Project

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

More To See

How Far Can You Run Low Voltage Lighting

How Far Can You Run Low Voltage Lighting? Exploring the Limits of Low Voltage Lighting Installations

What is the Difference between RC Coupling and Transformer Coupling

What is the Difference between RC Coupling and Transformer Coupling? In-Depth Guide

Oscilloscope Probe X1 X10 Difference

Oscilloscope Probe X1 X10 Difference | Detection and Compensation of Probes

How to Measure Amps on 240V Circuit With Multimeter

How to Measure Amps on 240V Circuit With Multimeter | Step-By-Step Guide

More About

  • Arduino
  • Basics
  • Circuitry
  • Communication
  • Components
  • Conductivity
  • Digital
  • How To
  • MicroController
  • Oscilloscope
  • PIC
  • Project
  • Simulation
  • Using 555 Timer
  • Using Op-Amp
  • Wiring

Footer

QUICK LINKS

  • About Us
  • Privacy Policy
  • Terms and Conditions
  • Contact

AFFILIATE DISCLOSER

Circuits Gallery is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to amazon (.com, .co.uk, .ca etc) and any other website that may be affiliated with Amazon Service LLC Associates Program

© 2023 · Circuits Gallery | All Rights Reserved