Automatic Garden Light Controlling System

Automatic Garden Light Controlling System

Just like my previous circuit using LM358 this is also very cheap,also under 100 rupees. This is a circuit for controlling the street lights,garden lights,automatically. You don’t need to turn it on and turn it off again and again,  just turn on the circuit once and forget, it will automatically manage itself by sensing the available brightness in the garden or street.

Circuit Diagram

Automatic Garden Light Controlling System Circuit Diagram

Automatic Garden Light Controlling System Circuit Diagram


In this circuit the IC LM358 is working as a comparator. The transistor BC548 is wired as a switch to turn on the relay. The 10K pot is used to adjust the sensitivity of the circuit. When the darkness goes below a certain level (this level can be controlled by varying the 1oK pot) the voltage at pin 3 (of LDR) will become greater than the voltage at pin 2 (set by 10K pot) and the comparator output goes high. This turns on the transistor and relay connected to it.

You can connect any type or any number of lamps. You should choose the relay according the the current rating of the lamps.

Note : This project is same as Automatic Night Lamp.

So make this circuit to Save Energy and Build a Better Tomorrow………

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Comments (15)

  • Eligeti Anusha

    is this circuit works for 12vdc

    October 9, 2012 at 11:46 am
  • Ligo George

    Yes it will work………..

    October 9, 2012 at 4:19 pm
  • Rajivaik

    I want to get circuit and program to control porch light using Atmel 89S52 and RTC

    October 13, 2012 at 8:52 am
  • Fitzpatrick C. Cunanan

    can I ask something about your automatic light garden controlling system?
    what kind of logic ic is LM358? is it a XNOR gate?

    January 6, 2013 at 9:33 pm
  • Ligo George

    It is not an XNOR gate…. It is an opamp comparator. .. When the voltage on the + terminal (non inverting input) becomes greater than the voltage on the – terminal (inverting input) output will become high.

    January 7, 2013 at 7:11 am
  • fitzpatrick cunanan

    okay, thank you…

    January 7, 2013 at 9:54 am
  • Fitzpatrick C. Cunanan

    good evening,
    what kind of electronic circuit i can make with 4077 ic?

    January 8, 2013 at 9:18 pm
  • Ligo George

    CD4077B – Quad Exclusive-NOR Gate

    January 9, 2013 at 6:55 am
  • Fitzpatrick C. Cunanan

    thank you very much….

    January 9, 2013 at 8:46 pm
  • Fitzpatrick C. Cunanan

    Good Evening…

    Can I ask a favor?

    Can you help me on how to make circuits that uses XNOR Gate?

    January 10, 2013 at 9:52 pm
  • Ligo George

    The output of a 2 input XNOR gate will be high when both of it input are same ……………..

    January 13, 2013 at 10:09 am
  • Fitzpatrick C. Cunanan

    Good Evening…

    Sorry for disturbing you again. I’m only a beginner in circuit designing.
    Can I ask one more thing?
    I want to design a circuit that uses XNOR ic but I cannot make one even simple one.
    Can you make schematic circuit design that uses XNOR ic’s for me?
    I know it is to much.

    I hope you can help me.

    January 20, 2013 at 7:14 pm
  • isaac

    hello i am new to electronics but i want to design a light switch that can be controlled by a motion sensor as well as a remote,please help me to design this to switch for my room light, VAC is 230

    September 29, 2015 at 8:47 pm
  • Golam Rasul Chowdhury

    During evening relay ON/OFF continuously. Light damaged within few days.

    September 8, 2016 at 9:27 am
  • Ligo George

    Try changing the value of R1, such that it will reduce the effect of LDR resistance.

    You can also provide a positive feedback for the opamp (schmitt trigger).

    September 10, 2016 at 10:22 pm

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