Light Sensor circuit on Breadboard + Darkness Detector | LDR & Transistor Projects

Elonics - Electronics Projects on Breadboard

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A tutorial on How to make a Light sensor circuit and Darkness detector circuit using LDR and transistor, along with detailed explanation on how the circuit works. The sensitivity a.k.a. the brightness at which the LED turns On or Off can also be adjusted using a potentiometer.
This circuit can be used to automatically turn on-off lights or appliances by adding a relay at the output (i.e. at the collector of transistor).
For circuit diagram plus more Info, visit:
elonics.org/light-sensor-and-...
Components Required:
* 1 LDR (Light Dependent Resistor or Photo-resistor)
* 1 npn Transistor (I used BC547)
* Resistors: 470R, 1K (For Light Sensor), 47K (For Dark Sensor)
* Potentiometer (Only if you need adjustable sensitivity): 10K (For Light Sensor), 100K (For Dark Sensor)
* Breadboard
* Power Supply: (3-12)V
* Few Breadboard Connectors
This channel has a lot more electronics projects and experiments. Feel free to check them.
For more electronics projects, visit: elonics.org/
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Опубликовано:

8 дек 2017

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Комментарии : 202

@iye2008 5 лет назад

One of the best tutorials on LDR and vivid explanation in a grammatically correct English which is simple and easy to grasp by even a layman like me! Theory, principles involved and a beautiful explanation on the practicals! Thank you so much! Looking forward for more in future!😊

@elonics 5 лет назад

Thank you for the compliment!

@superjimbo1945 6 лет назад

This gentleman is a very good teacher and explains principles of circuits well, thanks

@Joe-sx1iu 6 лет назад

Thank you for making these videos!

@shvideo1 5 лет назад

Excellent video. Very educational. Thank you for covering it so comprehensively. Thank you for sharing.

@elonics 5 лет назад

You're welcome

@mukulkumar9664 6 лет назад

this video was really helpful specially the circuit diagram for the darkness sensing circuit keep going brother

@Berghiker 6 лет назад

Amazing. I finally got it working after hours and hours. It will not work on an unregulated power supply so I tried a 6V battery and it worked!!!!!

@ranahetanshi3187 4 года назад

I tried many times this experiment but only after watching your video I succeeded. Thank you a lot😊

@Phil8sheo 5 лет назад

You explain very well and I thank you.

@borisdorofeev5602 6 лет назад

You are awesome. You have the best, easiest to follow electronics projects on youtube. There is no distracting electro music or confusing information. Thank you sir for giving the greatest gift, knowledge.

@hotdogsaber7233 6 лет назад

Great projects,simple to understand.

@realtrickybilly 6 лет назад

Nice to see you making videos again. Thank you.

@elonics 6 лет назад

You are welcome trickybilly

@adityakashyap3429 3 года назад

Great thing about your videos is you explain everything in good manor

@athulyajose 5 лет назад

Thanks a lot for this video... It was very helpful !!!

@sunilmathew2914 Год назад

Very well explained. Thank you!

@kingofelectronics7417 4 года назад

The explanation was great i've seen many vids like this but none of them explained like u great work bro!!

@mekhigary3241 3 года назад

Dunno if anyone cares but if you're stoned like me atm then you can watch all of the latest movies on instaflixxer. I've been binge watching with my girlfriend for the last couple of days =)

@estebanarchie3292 3 года назад

@Mekhi Gary Yup, I have been using instaflixxer for since november myself :D

@prashantsaraswatxii-b3673 2 года назад

Can you plz tell the reason that while using 1K resistor, it's light activated and while using 47K resistor, it's dark activated, why ?? Plz tell

@thebear8068 6 лет назад

Excellent, simple description. Thank you.....

@elonics 6 лет назад

You're welcome

@redhway7538 Год назад

THANK YOU SO MUCH SIR! You are an awesome man.

@mariocta880 Год назад

Ty for showing it really helped me in class

@ON-ne2zp 3 года назад

Thank you it helped me every much in my school project

@clicksandbeeps61 3 года назад

IT WORKED! great vid! Thanks!

@elonics 3 года назад

You're welcome!

@muralikatta834 2 года назад

I am impressed to your explanation sir it's really excellent 👌🔥

@Zaheraboukhashbeh1991 6 лет назад

great video, thanks

@TJkids007 2 года назад

Great work sir!

@LouisBos 2 года назад

Thank you for making this video. I spent hours searching and this is finally exactly what I needed. Your other videos are very interesting as well.

@paolochong5869 4 года назад

Thank you.. Nice electronic project.. very understandable explanation and easy to follow diagram presentation.. keep doing such informative videos.. it helps people understand and enjoy doing electronics projects..

@elonics 4 года назад

You're welcome. And thank you for the motivating feedback :)

@danmusiceasy 2 года назад

Very nice explanation and easy to follow! What I don't understand is why a higher resistor in series makes the LED turn on with less light, and not the opposite way.

@pacowang283 6 лет назад

Excellent tutorial. Thank you sir

@elonics 6 лет назад

You are welcome

@joepage3065 5 лет назад

Very informative, thanks.

@elonics 5 лет назад

You're welcome

@dayasena3866 4 года назад

very hadly find these kind well explain vidoes,, other just build the circuits,, u r awsome... ad more and more video,, i will ask my feind to subscribe,, i am from New York.. love this video,,,

@naderhumood1199 5 лет назад

Aptly great explanation, v useful proctice. . Thank you Sir I'm following up. ...

@pachunkarnilesh7681 Год назад

Your video is very good for learning

@Bianchi77 2 года назад

Creative video, thanks :)

@dancoz5477 10 месяцев назад

Bravo bien expliqué. 😁

@TheNightmR Год назад

Great thanks, this video help me to build my project

@sstarshaleen838 Год назад

Can you help me out too...i want to make this project so can you give me the precautions i should take or the mistakes that you might have committed

@zarceon9168 4 года назад

Liked and Ticked the notif bell...Goodprojectand explanation... Keep it up..

@easytoelectronics8650 4 года назад

Very nice explanation 👌

@muhammadaarif3019 6 лет назад

Awesome video as alwazz... keep going..wish u LUCK😂

@ravitejalagudu8941 6 лет назад

excellent chakri...great work!!

@elonics 6 лет назад

Thanks ra

@ambroise3624 5 лет назад

How does the fact of reverse thé resistance and the ldr, make it a night sensor ?

@Ziplock9000 3 года назад

What common MOSFET can I use instead of the transistor for driving a bigger load (say 8v @ 10mA) ? Also which LDR, there's different ones with different resistances.

@goms2939 6 лет назад

Welcome back! 👍

@elonics 6 лет назад

👍

@khadijasoomro3519 3 года назад

Highly Appreciative.. Your project has helped me in making my project m making there reports. Thank u for being a blind Help🍁

@elonics 3 года назад

You're welcome!

@justbanter8727 5 лет назад

Thank you, perfect for what I'm looking for: My Motorcycle has no fuel warning light so I'll be using this type of cicuit (modified) to detect the presence of fuel in my fuel line just below the fuel tap - I'll be adding a short 'clear' tube to the existing line & then fully enclosing the project, adding a small *𝒃𝒂𝒄𝒌𝒍𝒊𝒈𝒉𝒕 adjacent to the LDR on the opposite side of the line (this will then be connected to an LED warning light on my dash). * The idea being that there will be detectable differential in the strength of the *𝙡𝙞𝙜𝙝𝙩 𝙨𝙤𝙪𝙧𝙘𝙚 as the clear tube becomes devoid of any fuel. It will give me time to engage the reserve tank via the tap (as the carburettors hold a small amount of fuel in their float chambers) - there ain't nothing worse than feeling that sudden drop in engine power as you unexpectedly find yourself on empty!!

@elonics 5 лет назад

Pefect! That's a great idea. Small automation's like this will make our daily experiences seamless.

@qubitevo 6 лет назад

Awesome video, I will also make and post in my RU-vid channel

@coctakiesmaster4513 5 лет назад

nice video something to know

@shaswatshah4920 3 года назад

By inserting the LDR with PIR would I still need 10k potentiometer for LUX adjustment or will the 501 potentiometer will work?

@shoesealpoudel3344 4 года назад

what with that resistor connected series with the led what should be the rated value and how can i get that

@creativetechnology2752 6 лет назад

super bro

@MemoThePanda 2 года назад

Thank you! Feel very capable after being able to make this even if it's ot much its a start

@user-vp5is8mi4x 2 года назад

Hello, my sensor does not work. I don't know the problem. Is the reason that I used a resistance of 1 k instead of 470 ohms, and I also used a voltage of 9, not 12?

@MemoThePanda 2 года назад

@@user-vp5is8mi4x it depende is the led just not turning on or it's always on , it might be the resistir or the wireless are connected properly

@user-vp5is8mi4x 2 года назад

@@MemoThePanda The led is on normally, but when I put my hand on the sensor, the led does not turn off

@abhiramcd 3 года назад

I love it

@ajelectech1293 6 лет назад

Good video..

@mrsonic5663 2 года назад

thansk for video

@priimets 2 года назад

It's working! Tnx

@user-vp5is8mi4x 2 года назад

Hello, my sensor does not work. I don't know the problem. Is the reason that I used a resistance of 1 k instead of 470 ohms, and I also used a voltage of 9, not 12?

@syedumarjunaid5499 2 года назад

My ldr circuit led keep-on in room light but when i shine mobile torch on it it turn-off as it suppose to. My question is that why led is not turning off at room lightning and turning off at mobile torch light?

@pythondoesstuff2969 4 года назад

This isn't working when I make it I use a 330 ohm resistor with 3 volt power supply.... I think the base is shorting to ground.. Pls help!

@m.w.a.n 8 месяцев назад

Can I swap the photo resistor and variable resistor so that the LED turns on when there is light and turns off when it is dark?

@karthi-karthika 3 года назад

Very nice....

@glennkrieger 3 года назад

Nice explanation. However, it would have been good to see a schematic with the potentiometer inserted. It's a bit difficult to figure it out by just looking at the changes you made on the breadboard.

@Khadjs1804 Год назад

Can this be used to trigger a relay? Im planning to make this and install it in a car without automatic headlights on.

@prashanthreddypavuluri6808 7 месяцев назад

Sir ,can we replace the npn transitor in the given with JFET transistor

@OviMG Год назад

is it posibile to change leds with a light bulb and work the same way?

@user-vp5is8mi4x 2 года назад

Hello, my sensor does not work. I don't know the problem. Is the reason that I used a resistance of 1 k instead of 470 ohms, and I also used a voltage of 9, not 12?

@tomety_tcg2073 3 месяца назад

Could anyone explain how just changing the places of ldr and resistor changes what makes the transistor work?

@christereriksson9506 3 года назад

I would like to use 10 leds with 12v and a lightsensor. Is that ok. or do I have to use one transistor for every led? Regards from Christer from Uppsala

@susmitadey9816 4 месяца назад

Hi! I don't get the potentiometer connection. Can you please help me out ?

@Dinesh-Bhardwaj 3 года назад

How can i connect a relay i this circuit, i have used relay but it is turning on and off, (the voltage is decreased at output)

@gellagopalrao996 6 лет назад

nice video Sir. plz upload more electronics videos

@elonics 6 лет назад

Thanks, sure!

@EmirUysal 3 года назад

thank you

@user-vp5is8mi4x 2 года назад

Hello, well done for the clip. I will take this experience and work on it, but I have a problem. Our doctor wants a report on this experience and I do not know what to write. Do you have any of these?

@mehulkhoiwal8352 6 лет назад

Sir,how can i made the same with the supple of ac?

@dannyjensen4954 3 года назад

Thanks

@cri8tor 5 лет назад

Hi. Found a night light with one component labeled PCR 606J, one tiny resistor with Red, Black, Green and Gold bands in that order and a light sensor. Don't know what the PCR 606J is? Thought it was a transistor, but it may be a tiny SCR. Are you familiar with this type of light sensor circuit? Cheers

@djaymigz98 2 года назад

Will this diagram work on a 12v DC light ?

@ranoa9188 Год назад

Hi, do have tutorial for this circuit using 2N3904? thanks in advance

@muhammadizzuddin8766 Год назад

Can I use transistor BC548 instead OF BC547 for this project?

@thalesengraving7915 Месяц назад

Can this be done with a 120v set up?

@nishad9970 6 лет назад

Can i get the circuit daigram of LDR dark sensing circuit...

@AWESOMEEVERYDAY101 6 лет назад

hey can u plz show how to make transmitter and receiver(ir) for wire less car

@OXFORD486 6 лет назад

How long would a 9 volt battery (PP3) last?

@muhammadrafiqulislamkhan6994 3 года назад

I try your IR proximity sensor circuit but it won't work. Would pls give the circuit disgram to make it easier. Thanks sharing.

@d.madhankumar6795 4 года назад

Hello bro I'm a big fan of ur voice. And I request you to make a video about the speed control of a DC motor using this same LDR method . Pls bro plzzzzzzzzzzzzzzz. I'm waiting for that video bro pls. Thank you

@khadijasoomro3519 3 года назад

Can we plot ir sensor circuit with 555 Ic...

@adnanahmadknowledgevideo 6 лет назад

How to make a transmiter and reciver for rc car

@jeeplvr2000 3 года назад

Excellent video. I am going to build the darkness detector circuit but add a timer that shuts off the light after a few hours. Any suggestions?

@sstarshaleen838 Год назад

Hii

@sstarshaleen838 Год назад

Did you make the dark sensor circuit?..I am unable to make it

@chaserc3699 Год назад

Would this work if you used an LED strip instead of an LED

@shivpatel3590 3 года назад

Sir can we use this for 220V ?

@shashwatsangle7460 6 лет назад

Hi I want to know that what this bc 546 refers why didn't you used 2n2222 in place of that ,I am very confused.please make tutorial on it , because there nothing on RU-vid about the transistors,which show us what these numbers refers.

@rpbajb 5 лет назад

shashwat sangle Those two NPN transistors are essentially the same, just favorites in different parts of the world. Use what you have.

@navneetkishore8039 Год назад

Link for circuit diagram is disabled it seems. Please do something 👍.

@mordecaibot 5 лет назад

Could I use 2n3904 transistor instead of bc547?

@elonics 5 лет назад

Yes you can. Just make sure you match the emitter base & collector pins.

@user-js6tv8ei8w Год назад

Can you convert the motion sensor to a metal sensor, thank you

@bhavanashreen9183 2 года назад

Can I get synopsis and report on this project

@clawson7064 2 года назад

can you find these LDRs in stores or can you pretty much only find these online?

@user-wy3xe2tt3y 2 года назад

If you want to save time ordering one on eBay or Amazon just go to Walmart and buy one of their cheap led night lights that is light sensitive. You can buy them in a three pack for maybe three or five dollars. Then take them home and unscrew the case and cut the LDR out and you’re ready to have fun experimenting!

@abhishektr2074 3 года назад

What changes must be made if we need to replace dc motor in place of led. Should any resistance be varied.. Pls reply @elonics

@elonics 3 года назад

Depends on which transistor you are using. If it can drain higher power, you may try directly connecting the DC motor. Otherwise you need to add another transistor/mosfet to this circuit's output and connect motor to it. (See: Driving a DC motor using transistor / mosfet)

@abhishektr2074 3 года назад

@@elonics its a 3-9v dc motor and transistor used is bc547 to a 9v battery

@yashshinde3649 Год назад

Can anyone explain why we need to use a transistor here

@bobrudra5752 2 года назад

Great video. I installed a porch light with built in dusk to dawn sensor. Light turns on even when there is plenty of light outside. sensor is facing the street. Can I modify by adding a resistor etc. so it turn on when there is dark outside. Thanks and take care.

@user-vp5is8mi4x 2 года назад

Hello, my sensor does not work. I don't know the problem. Is the reason that I used a resistance of 1 k instead of 470 ohms, and I also used a voltage of 9, not 12?

@EmirUysal 3 года назад

I'm just trying to understand why we need more resistance in dark sensor (47k) as opposed to the one in the light sensor (1k). If anyone can elaborate on that a bit, that'd be hugely appreciated.

@EmirUysal 3 года назад

is it to drive more power to the LED, as the resistor is in parallel to the LED, by keeping the resistor high in value we direct more of the current to our LED instead of wasting on the resistor?