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Automatic Street Light Control System.(Sensor using LDR & Transistor BC 547.) Very Simple.

 Automatic Street Light Control System.(Sensor using LDR & Transistor BC 547.) Very Simple.
Briefing:


Her is our new simple Electrical/Electronics project about Automatic Street Light Control System. 
  • it is a simple and powerful concept, which uses transistor (BC 547 NPN) as a switch to switch ON and OFF the street light system automatically.
  • It automatically switches ON lights when the sunlight goes below the visible region of our eyes. (e.g in evening after Sunset). 
  • it automatically switches OFF lights when Sunlight fall on it  ( i.e on LDR ) e.g in morning, by using a sensor called LDR (Light Dependent Resistor) which senses the light just like our eyes. 
Advantages:
  • By using this Automatic system for street light controlling, we can reduce energy consumption because the manually operated street lights are not switched off properly even the sunlight comes and also not switched on earlier before sunset. 
  • In sunny and rainy days, ON  and OFF time differ noticeably which is one of the major disadvantage of using timer circuits or manual operation for switching the street light system.
Enough....Now lets begin ( Step by Step)


Requirements
  • LDR Light Dependent Resistor
  • Take 2 transistors. (NPN transistor- BC547 or BC147 or BC548)
  • Resistor- 1K, 330Ohm, 470 ohm
  • Light emitting diode (LED) - Any color
  • Connecting wires- Use single-core plastic-coated wire of 0.6mm diameter (the standard size)-You can use wire that is used for Computer Networking.
  • Power supply-6V or 9V
Procedure
  • Insert first transistor Q1-BC547 (NPN) on breadboard (or general PCB) as shown in the circuit diagram 1.
  • Connect another transistor Q2- BC547 (NPN) on breadboard as in step 1.
  • Connect  wires across emitter pin of both transistors and –ve terminal of battery (lowest/ bottom row of breadboard.)
  • Connect  a wire across Collector pin of transistor Q1 and Base pin of transistor Q2.
  • Connect a resistor 1K across positive terminal of battery (topmost row of breadboard) and Collector pin of transistor Q1.
  • Connect  Light Dependent Resistor (LDR) across positive terminal of battery (topmost row of breadboard) and base terminal of transistor Q1.
  • insert a resistor- 330 Ohm across base pin of transistor Q1 and negative terminal of battery (lowest bottom row of breadboard).
  • Connect a resistor 330R across positive terminal of battery (topmost row of breadboard) and anode terminal of LED (Light emitting diode) & Connect the cathode terminal of LED to Collector pin of transistor Q2.


The simple circuit is ready for testing now. Connect 6V battery terminals to the circuit as show in fig and see the output. As you block light falling on Light dependent resistor (LDR), the LED glows.

LED GLOWS EVEN IN LESS DARKNESS. Use torch light or Lighter if the LED glows in less darkness. in addition, you can try to adjust the sensitivity of this circuit by using a variable resistor in place of R1-300Ohm. Try this circuit with other resistances as well, (e.g, 1KΩ, 10KΩ and 100KΩ, etc)


PICs Story: ( For Zooming View images in new tab)

 Requirements:



Circuit Diagram 1.Automatic Street Light Control System.(Sensor using LDR & Transistor BC 547.) Very Simple.  We have tried this one in this tutorial bu you can also try the second one

Circuit Diagram 2 .Automatic Street Light Control System.(Sensor using LDR & Transistor BC 547.) Very Simple.
As Light is falling on LDR ( Light Dependent resistor) So LED does not glow. ( LED = Off)                                                            Image Taken Our from Video

You can see now that we have blocked light falling on Light dependent resistor (LDR), so the LED glows ( LED = ON)             Image Taken Out from Video

By: Wasim Khan
http://electricaltechnology.org/

Step by Step Procedure video...Coming Soon..

59 comments:

  1. Anonymous09:30

    brother this ckt only work for very small load , if you wana going to do it paractically fo 25watt or above load then your bulb/load will start flickering , so there for paractical point of view i suggest to use 555 time , which can easily handle 100watt load with out flickering

    ReplyDelete
    Replies
    1. Agree...But this is a simple project...I have also project report..where all Circuit diagrams available i.e. for small, normal and large loads..

      Delete
    2. Friend You can easily controll hight wattage Items by the using of 6VDC Relay Instead of 330 ohm Resistance and LED. By Using 2nd Circuit Displayed by Wasim Khan

      Delete
    3. @ Bhatti Soft kindly paste a link of the crkt displayed by wasim khan
      thanks

      Delete
    4. do you know what is the main reason of flickering that is the light which is on the load feedback the LDR that's why an error-full control system will created automatically.you need to separate the light source from your LDR.LDRshouldn't response on it's own circuit load and of-course you need to add relay or traic with very little labor to make it a strong circuit..BEST OF LUCK :)

      Delete
  2. Anonymous13:06

    No dOubt eFForts aRe goOd nd simpLe...thnx buDDy.. :)

    ReplyDelete
    Replies
    1. Welcome Dear.... Thanks 4 appreciation

      Delete
    2. Anonymous01:12

      Dear can u help me for final year project of electrical technology

      Delete
  3. Anonymous11:40

    am doing the same project will u send total project pdf ......please

    ReplyDelete
    Replies
    1. If you face any problem.,then ask here...Thanks

      Delete
    2. Anonymous21:58

      It is very helpful for beginners like us. Thax a lot for sharing. Bro kindly provide a simple circuit, I need to control street light 220 v with using LDR. In sunlight my street light turns on & at night turns off automatically, for that kindly provide a circuit.

      Delete
  4. Good work, in present time to balance the lighting consumption it is very necessary to employ this lighting technique. Led lighting is good source of light; it will require less electricity and also provide much brighter light as compare to other traditional lighting sources.

    Reference: http://www.adattsi.com/induction-lighting/high-bay

    ReplyDelete
  5. Super.Now a days in solar streetlight systems some peoples are using voltage based Controllers.Is this right( i meant it voltage sensors).
    If this is right please furnish the details about this type of circuit diagram.

    ReplyDelete
  6. can this actually be incorporated practically in the streets..? how would one accomplish it using this simple circuit and installing it into real street lamps?

    ReplyDelete
    Replies
    1. I have a complete project on this.... i will upload and share pdf link.....Thhanks

      Delete
    2. Anonymous21:59

      plz upload soon & provide link here.

      Delete
    3. Anonymous20:01

      It'd be very simple actually. Swap out the low wattage components used in this example with some higher wattage ones, replace the battery with a 120/6 volt transformer + a rectifier and filter capacitor & put the coil for a contactor that would switch the mains power for the street light on and off in series with the transistor.

      The circuit would be almost identical to the one showed here, except it would be mains powered, would be controlling a contactor instead of a single LED, and thus be able to withstand higher currents associated with it.

      Delete
  7. I personally liked using the services of electricians-capetown.com for their great services, as they are truly professional, knowledgeable and trustworthy.

    ReplyDelete
  8. i have to control around 6 tubelights in a room using this circuit bro
    can u plz help me out with the circuit

    regards

    ReplyDelete
    Replies
    1. We will update the circuit...Thanks

      Delete
  9. Anonymous22:07

    can we used relay instead of led?

    ReplyDelete
    Replies
    1. Which one and for which purpose?

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    2. relay insted of led????
      both are very different from each other

      Delete
  10. Undergraduate17:12

    i'm not sure if i'm right, does the Q2 in the circuit 2 should be a pnp transistor instead?? please help me understand . thanks...

    ReplyDelete
  11. i'm now currently trying out the 2nd circuit, but then it didn't work out... i don't know if i mistakenly connect the components, but i've tried dozen times already...can you please help me show the full circuit of it on breadboard? thanks

    ReplyDelete
    Replies
    1. Have you tried the first one....if not then try it.....by the way...i have tried these both circuits and its working properly....Also, I will upload the video to YouTube and then share the link here.

      Delete
    2. Anonymous18:29

      hi
      can some one suggest me how to incorporate with AC outdoor light for 100 watt.....Please suggest me how to use 12v relay to use higher load. Please provide me circuit diagram where AC out can be define there.
      If you send me diagram on email ID, It will great for me.

      Regards
      rabikant09@rediffmail.com

      Delete
  12. Undergraduate19:24

    wait i realized that circuit 2 will turn on the led when there is no light on the ldr, while ciruit 1 turns on the led when there is light?? light decreases the ldr's resistance right???

    ReplyDelete
  13. Undergraduate19:29

    circuit 1 differs to circuit 2... circuit 1 is led on when there is light while circuit 2 is led on when there is no light... Is this correct??? resistance decreases with light right?

    ReplyDelete
    Replies
    1. Anonymous19:00

      when there is bright outside , resistance decreases
      and when there is dark outside, resistance increases (LDR)

      Delete
  14. simply project..it's for beginner..

    ReplyDelete
  15. Anonymous07:24

    how can i make it more sensetive.. .........
    ...mine led is also glowing in room light .. i have to provide an torch light to LDR to switch off

    ReplyDelete
  16. Anonymous08:20

    can i use a 9 volt battery??
    plz replay

    ReplyDelete
  17. Anonymous12:27

    Is there any project in which led glows in brightness .. What are its uses ...

    ReplyDelete
  18. Anonymous20:22

    Hi all.
    First circuit is wrong. There is no doubt any expert eye can detect its mistake. :)
    I am an electronics engineer

    ReplyDelete
  19. Anonymous20:26

    hi can you tell me the function of each element you have used like what is the use of transistors in this ckt and resistors .....i would be very grateful if u wud help me out.
    thnx in advance

    ReplyDelete
  20. can we use this ckt for ac 230v or more voltage


    ReplyDelete
    Replies
    1. ya but u have to tuse more elements likr step down transformer,relay,555IC for ac source.

      Delete
  21. Simple and cheap. Can you give the details of the battery charger including overcharging protection.?

    ReplyDelete
  22. In Electronics Store, You can Easily find a Battery charger about (6-9V, 0.6 - 1.2A)

    ReplyDelete
  23. I would also likely to know about the use of transistor in the circuits........ It would be very helpful

    ReplyDelete
  24. can u please suggest some human and vehicle detection sensors used in street light????????

    ReplyDelete
  25. Thank you so much with regard to giving me an update on this topic on your blog..Thanks for your time and consideration of other individuals by making this web site available.

    ReplyDelete
  26. brother i do but when led on when ldr in light and when dark led off plz help...

    ReplyDelete
    Replies
    1. same thing happen with me also... have u got any idea ragarding this problem..
      tell me pliz if u find out..

      Delete
    2. Which Circuit did you make..1 or 2 ???

      Delete
  27. I'm interested in this project and want to realize such this year as a final proposal. Please I need a little bit advice?

    ReplyDelete
  28. please send me a block diagram of automatic street light control system (LDR as the sensor).

    ReplyDelete
  29. Anonymous16:40

    i cant get the output for second circuit LED is continously glowing,
    and for the first circuit output is reverse. what to do?

    ReplyDelete
    Replies
    1. Check your connection...btw..I will Upload step by step video.. :)

      Delete
    2. Anonymous10:15

      thanks i am waiting for it

      Delete
  30. Please help, what is the use of the transistor BC 547? and the other components? please help. i will be using this for my project..

    ReplyDelete
  31. Which transistor is used

    ReplyDelete
  32. I have made this circuit along with a relay and using it to control a tubelight in my lawn. As the sun goes down, it starts flickering for few minutes and then work properly. How can I handle the flickering

    ReplyDelete
  33. i have made the simpler circuit given by you but the ldr works inversely that means when light falls the led glows.i want it the other way round.please help

    ReplyDelete
    Replies
    1. Which circuit did you try... Make sure to connect all the components in proper direction....

      Delete
  34. well done ..............(i'm sri lanka )

    ReplyDelete