How to make LDR Darkness Sensor Circuit Simple DIY

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In this video i will show how to make LDR Darkness Sensor Circuit
Asimple science school college project.
BY USING THIS CIRCUIT WE
CAN TURN ON LIGHT IN
DARKENESS
& TURN OFF THE LIGHT IN BRIGHTNESS
ITEM REQUIRED
1) LDR-----1No. amzn.to/2rNr33i
2) 50KOHM RESISTOR---------1No.
3) 1KOHM RESISTOR---------1No.
4) BC547 TRANSISTOR---------1No. amzn.to/2rNxpjm
5) 9V BATTERY---------1No.
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4 окт 2024

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Комментарии : 700

@philipdalton1000s 2 года назад

I designed something similar to this and managed to get it published in a magazine. My idea I thought up was a "Digital Darkness/Light Measurer". It used a light dependent resistor and a 556 silicon chip, amongst other things, to measure the amount of light or darkness in a room on a scale of 0 to 9, on a digital display. It was published in the "Everyday Electronics" edition of April 1983. I was paid £12 for my work.

@nayyarrashid4661 3 года назад

My Uncle who is a radio mechanic made the same circuit in the 80s. He used a power transistor and cut it on the top to make an LDR and he installed the bulb outside in the street. The bulb would go on when the sun set and provide light to passerby at night time.

@rupendrasonimat5244 Год назад

Increasing resistance to 2k and exposing LDR to high intensity light worked for me you can also try it Thank you for the help 😊

@EdwinFairchild 6 лет назад

man one full view of the schematic would have been great , some of us dont need to see the wire going inside the breadboard, just a schematic shot for those who can read it and move on

@FlowerRFabulous 5 лет назад

thats literally how i feel! and i dont need the music. i need the explanation behind how everything works!!!!

@unionpacific7 5 лет назад

It is a link on description, click and you can find the schematic.

@mr.mythoclast4451 4 года назад

LED+ to VCC and LED- to Collector Resistor to VCC and Base LDR to Base and GND

@LorDToxchY 3 года назад

Selfish

@cardsigner 3 года назад

Negative. Actual video showing that it works, is in accordance to Galileo Galili's scientific method, proving that it works.

@ishakohli2140 6 лет назад

This video was really helpful....my physics project was really appreciated 👍👍

@sam-ip7nn 3 года назад

Yess!! It works perfectly

@ProfessorInventor 3 года назад

You are a genious Engineer

@himanshukubde76 5 лет назад

I made the same project but it is not working can you tell the reason i make the same connection

@rahimahjofferi3560 7 лет назад

Its a great and helpful tutorial, thank you! but what if I want to add 13 more 4.5 lumens of LEDs to the construction to make it brighter? Current limit is 25mA Do you mind helping me how the construction is going to be like? For eg. how many more resistors do I need to add and what are the values for each resistor? Your help and response would be more appreciated!

@ProfessorInventor 3 года назад

I also have made a shadow detector circuit. You can also watch it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-f1Seudbs5F8.html

@Pehesara_Gaming 2 года назад

Make a relay circuit

@hudsonsamraj4960 6 лет назад

It works 😇 After 'n' number of times lol !

@samirgajbhiye6720 5 лет назад

@saisandhyadinchetty7141 4 года назад

Plz frnd tell us truth because I need to implement it in my project plz

@the_jd6967 3 года назад

I am planning to make this my first electronics diy project

@tommygun9416 3 года назад

Hey guys, great video. Are you able to tell me the resistors I'd need to run this off 4.2V please?

@mulpurubakthasingh1247 3 года назад

bro , for me always led is in on condition

@ParthPatel-uu9gh 3 года назад

Same here problem

@zas-fp9gt 3 года назад

I had the same problem....I figured out that LDRs are not that sensitive in our homes or our daily environment....it should work in direct sunlight or when you throw torchlight on it...Hope it helps 👍

@hariprasadshanmugam9363 3 года назад

@@ParthPatel-uu9gh change the resistance bro..

@ProfessorInventor 3 года назад

I also have made a shadow detector circuit. You can also watch it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-f1Seudbs5F8.html

@mulpurubakthasingh1247 3 года назад

@@ProfessorInventor THANK U

@practicallab 4 года назад

its so simple circuit if we connect 100 k resistor with series with ldr it also properly work and if ldr ressitor value in kilo ohm connect mega ohm resistor with ldr it will also work.nice

@DeenuYogiMS 3 года назад

It isw working!Thank you

@MANIKANTAVINJAMURI 2 года назад

Hlo is it really working??

@karthikkonagalla6414 5 лет назад

It is working...thank you😀

@velusamy1833 5 лет назад

Bro for me working when light is there

@b.tech-beingtechie8450 4 года назад

@velu samy If u r getting it in opposite conditions interchange the position of ldr and resistors

@speedracer1968 4 года назад

Nice one, substituted a n2 2222 transistor and used 5v usb power supplied to a power board on the breadboard. Thanks!

@asiantific 6 лет назад

Can i replace buzzer with dc motor? I want to make something move when the laser is cut.

@jasonsarno4743 5 лет назад

It did not work to me. I just notice in the steps that the 1K ohm resistor was first in negative, then later on it was already in positive. please show also your changes next time when making a tutorial.

@mr.mythoclast4451 4 года назад

Blue 3mm LED BC547C (generic NPN like 2N2222 ...) in my Setup the standby-current is: 220 uA full on: 19,80 mA Put the Resistors from VCC to Base and LDR from Base to GND. You can also use a Potentiometer instead of the fixed Resistor-Value, to get the Spot you want to turn on/off the LED, then read the Potentiometer-Value with a DMM and grab a Resistor that exactly fits your need.

@techdicted 4 года назад

Yea, it failed o work for me too. But after I figured it out I made this video :- ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-cFFpI2N6r8o.html . Haha I am certain you already figured it out but hopefully, it may help someone else.

@usmanghumman021 4 года назад

Can we connect buzer with led

@ewanenkumberamsey1711 Год назад

wow amazing i like the project, but I have tried doing it using 2N2222 transistor but not working

@superfact4556 5 лет назад

Thank you very much

@iamsaood 5 лет назад

Very basic very useful

@aishwaryasajeev3575 6 лет назад

Mr Innovative.... Can u please tell me whether the method by which you made the LDR is 100% effective or not?? Because many of them in the comment section have said that it is working in the opposite way i.e., the led glows when the light is on... So,by chance if the same happens with me wheni make it, then how can I correct it and make it work in the proper manner?? As I have not tried to make it till now, I want to make sure that this project is 100% successful... So I hope that u would help me in making this project successful by replying to my quarry. I look forward for your kind and prompt reply. Thank you.

@zafaraj8211 5 лет назад

Dont worry, 1st try it yourself.

@Red-Feather 5 лет назад

Hi. I made this without a transistor and it works fine. What’s the transistor’s purpose? BTW, everything is connected to the (-) until minute 5:30.

@iamsaood 5 лет назад

I made it with transistor but no LDR & its still working.

@venkateshwara7519 4 года назад

I made this but not working

@krishnatkkb5101 5 лет назад

Will it work if use 20k r instead of 50k

@artuino9404 6 лет назад

Can we use bc548 transistor

@egothebeard 6 лет назад

I am right if I think I need to switch the 100kohm (2 50k’s ) resistors to one 10k resistor if I want to use a 5 Volt source? And can I use other transistors. I have some PNP transistors.

@ProfessorInventor 3 года назад

I also have made a shadow detector circuit. You can also watch it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-f1Seudbs5F8.html

@vinodvaisak2486 6 лет назад

Will only the exact resistor will work??

@navyajoshi8329 4 года назад

Can we use 100oms resistor

@santossifuentes2594 Год назад

Excelente.. pero tengo una duda que pasa si no utilizo transistor? Funcionaria?

@shreyapande3159 6 лет назад

Can we run motor in place of led

@voizek 4 года назад

Yes

@abhijithanilkumar4959 4 года назад

Good idea

@alberthoek2506 3 года назад

Thanks man it works

@mkkn3240 5 лет назад

nice project bro.... love from Pakistan

@zafaraj8211 5 лет назад

Me too!

@ajitkumar-jx8lt 5 лет назад

Will it work if I use 5 resistors of 10k ohm on series instead of one 50k ohm resistor ?

@b.tech-beingtechie8450 4 года назад

@ajit kumar resistor value depends on the resiatance of ldr during dark condition, it need not be 50k always

@susanthkothapalli6688 3 года назад

Help ..how can I increase sensitivity of the LDR?

@ajazamin9843 5 лет назад

please add a potentio meter to adjust the sensitivity of LDR. your project works only if there is immense dark inside the room what if there is partially dark inside the room.

@creativebangladesh3801 6 лет назад

It is working I love your chanal

@zafaraj8211 5 лет назад

Yessss!

@vishalkumar-qq7rf 6 лет назад

Can i use 10 led?

@minjaeson5286 5 лет назад

Is there a common emitter circuit or a common collector circuit in this circuit?

@rajraj-pu5uo 4 года назад

What is the name of the white object in which connections are done quora???

@binujohn5187 4 года назад

Breadboard

@hasmithanakka3061 6 лет назад

Can u explain its working wt happens

@bohemio224 Год назад

but how do you remove the flicker that is caused by the threshold between afternoon to enter night and vice versa?

@maskomsko1736 3 года назад

Sir please reply whether 100K resistor or 150K resistor is required🙏🙏. You using brown, green, yellow gold resistor that is 150k resistor

@jiwanbiswal 6 лет назад

dude did u used it for class 12 physics investigatory project

@frustratedboys2793 4 года назад

Can i use Bd 138 tranjister at replacing of BD 140? Help plz

@vishalkharat8316 4 года назад

You use c945 transistor

@tuhinadribanerjee3214 4 года назад

BD138 IS PNP TRANSISTOR. YOU CAN USE BY MATCHING THE BASE collector emitter pins , BUT IT WILL BECOME LIGHT SENSOR, NOT DARK as its pnp. BC547 is npn :D

@dakshagrawal3520 4 года назад

Can i make it without using that particular board that u have used? Plzz reply

@k.c.ddairy6789 6 лет назад

what is the name of the bord in which you placed the led ,ldr etc ?

@zafaraj8211 5 лет назад

Bread board

@mr.pirate9855 7 лет назад

Can i use any npn transistor

@jeremynicolas5017 6 лет назад

please show me the full schematic diagram because i wanted to make robot that will have a sensor like that

@shantanupaul2504 6 лет назад

I wnt to add a bell also ....so how can i do it?

@techdonhacker5110 6 лет назад

Shantanu Paul remove the led and put the bell or buzzer

@NMAH24 5 лет назад

Can u tell me why transistor is added

@practicallab 4 года назад

transistor work as a switch in this circuit

@RixtronixLAB 2 года назад

Creative video, thanks for sharing :)

@gautamchopra9939 6 лет назад

Request help:- My LED turns off in darkness.

@velusamy1833 5 лет назад

For me also

@MAAKiRasoi_Suman 5 лет назад

Mine also

@joeschmoe3815 4 года назад

The transistor must be npn not pnp. Make sure you have the right one. Sometimes they get mixed up when you buy them in assorted boxes.

@mr.mythoclast4451 4 года назад

LED+ to VCC and LED- to Collector Resistor to VCC and Base LDR to Base and GND

@practicallab 4 года назад

Resistance zayada kardo mega tak per kam karega

@sowmyakulal4786 3 года назад

Its very best and easy😀

@kaushanudebnath5562 6 лет назад

Thanks bro, it works perfectly

@rohanjha1156 3 года назад

Can I get your phone number, I want some help for this project? Or can we talk in instagram if you can share your id name. My id name is rohanjha150? Please reply 🙏🙏

@animebestie577 2 года назад

Bro , am studying in school so I don't use that bread board so can I use cardboard and add some wires at the back..... Would it work like that !???

@manyakapoor1111 2 года назад

of course not as there would be no connection like a breadboard

@trons1965 5 лет назад

Muchas gracias por tu vídeo, podrías enviar una foto con el circuito en placa por favor?

@ProfessorInventor 3 года назад

I also have made a shadow detector circuit. You can also watch it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-f1Seudbs5F8.html

@KarthiKeshRobotics 6 лет назад

its working bro super

@RahulKumar-ms2zv 6 лет назад

Thnk

@KarthiKeshRobotics 6 лет назад

subscribe to my channel bro and share pls

@RahulKumar-ms2zv 6 лет назад

@ItsSwarnim 6 лет назад

Jhootha

@sarveshtiwari4451 6 лет назад

Not really good

@fahaddaleem5268 6 лет назад

DEAR ... I built the circuit and I checked the output voltage it seems fine but I connect the output of the circuit to Arduino board inorder to run it but it doesn't work ... and I covered the LDR and connect the LDR circuit to Arduino circuit then I take the output voltage and found huge drop in the voltage ... I don't know why... can any body help me to sort it out and to run the Arduino board via photocell circuit ... I used 9v battery.

@ownerzennc3812 2 года назад

i tested something this circuit also works with an 2n2222 npn transistor!

@mukulsharma686 6 лет назад

Can we attach it with a mode of smart street light but the is a swetch can we take out the switch and place the sender please tell fasr

@NishkarshJain 6 лет назад

Can't we simply use a LDR light sensor module, a battery and a led????

@krishan_gupta_07 5 лет назад

Thnku so much.

@ChetanPatel-gl9jg 6 лет назад

Its working A kam kesa karata ha wo jara likh k batayo sir Plz help meb

@hrishavhrick2888 6 лет назад

I also practice robotics, and I have already made a circuit like that. Mr Innovative is talented, and I liked this circuit of him. But he did a small mistake in the circuit. He has put two 50k Ohm resistor in parallel, which results in 50 k Ohm. Resistance does not add up in series, so he actually set 50 k resistance, not 100 k. He needs to put the 50 k resistors in series to make it 100k. So before making anything, the laws and regulations should be learned first.

@mirdeu4687 5 лет назад

@lordmummie 5 лет назад

Thanks for confirming my suspicion of that. I'd also like to note that he puts his led resistor AFTER the led, which could cause the LED to burn out if left on for too long I suspect (At least the brightness of that LED makes me think that). Unless that LED can handle the full load of that battery and the resistor after it is to prevent a short?

@hrishavhrick2888 5 лет назад

@@lordmummie He should improve his circuit.

@msainivedha 5 лет назад

But he just used 2 100ohm resistors in parallel to make it 50ohm.... Isn’t it?

@zafaraj8211 5 лет назад

PLz understand carefully. He has put 2x100K resistors in parallel to make a value of 50K, which is right and it works well, I have tested right now. Its all ok. He is a genius fellow, has done rightly.

@hemantagrawal8693 5 лет назад

What will the values of resistors be if I use a 5V supply??

@practicallab 4 года назад

100 k work on 5 volt

@MJLouer Год назад

Uhm. It does not work. The led is on all the time. When i reverse the npn it works but in reverse mode. Lights out, led out, lights on led on. Hmm any thoughts?

@applecharlottec.sebello8669 Год назад

It is the opposite with me. It lights on when the surrounding is bright while it lights off whenever it is dark. What am i supposed to do with this

@butikito 6 лет назад

Hi I am not an expert in electronics/electricals, I need help on my solar lamp post. During daytime, it automatically switches off. But comes night, it doesn't turn on automatically. It comes with a remote control that I can switch on manually. What could be the problem? Can I rig the remote control and add a photoresistor LDR and put something to press and hold the ON button? Where can I connect the LDR in the circuit of the remote control? What is the specs of the LDR? The remote is powered by just 3v 2x1.5AAA battery.

@durgaadhikari4164 4 года назад

Sir its not working. In video you have tell that i have used two 50k ohm registers in parallel but you have used 100k ohm registers.

@praveenkumardas4555 7 лет назад

If we use small buzzer in case of led will it work?

@MrInnovative 7 лет назад

Praveen kumar Das yes it work

@sibijudepr7438 7 лет назад

it will work

@MystCraft. Год назад

can it work reversly like it will stay on till is in light and gets of when lights go out

@vibingsongs1734 4 года назад

Bro ithu automatic on off method ah ila intensity control panuma

@bssgkmsd8 3 года назад

Mine is backwards. Light makes it bright, and no light makes it off. I have everything wired according to the schematics. What am I doing wrong??

@MusicbyARNASH 5 лет назад

Can we use 47k instead of 50k ?

@mr.mythoclast4451 4 года назад

try some Values, this changes the on/off dependent on your current light Level

@OXFORD486 6 лет назад

How long will the battery last?

@Sciences-Database 4 года назад

Yeah This Circuit is very helpful. this darkness for The transistor bc547,s availability Because you are plugged into the transistor BC547. .. Confident For Scientific management ! >> Like.

@Thepeter956q 5 лет назад

Great job. What are showing to the people. Where are the safety equipment. How you can work with electric like that. I know the power as so low but what the people will learn. If any one tries this with 220V without PPE who will be responsible

@amjadatta7797 2 года назад

Can we take Resistor of our Choice ?

@MuzzWal 5 лет назад

Hi there, were all the electric components necessary in making this? The transistor and two resistors? Thank you :) And is that breadboard sold at any electrical store

@aryanpathak4234 2 года назад

yes

@yourchillbro500 6 лет назад

if I wanted to code this for assembly language, where would the input and output be located in this circuit for me to plug into a microcontroller?

@b.tech-beingtechie8450 4 года назад

@dari r You could configure any one of the port pin as input port and give the connection from the junction of led and resistors to that input.. Configure another pin as output port and connect it to transistor

@sridharghss 5 лет назад

where get the board?\

@arduinoandbeyond1668 6 лет назад

Is it neccesary to have the transistor and resistors? Cant you just use the power, LDR and LED?

@nyman7223 4 года назад

Is this circuit work on 5 volt ?

@practicallab 4 года назад

yes

@vjitesh13 6 лет назад

Can I use diode in this circuit please tell ?

@powerofpriceaction91 6 лет назад

Bro sent the link circuit diagram

@aabidhussainmir2386 3 года назад

He dude it's really simple to make this kind of led.

@miadikim 7 месяцев назад

very good video

@cutevashok 7 лет назад

I have a question? what is the need of transistor here, as it can be parallel and current can flow in through the sensor during light presence and it can become a high resistor during darkness, this itself will make the current to flow in the parallel path and make the light glow. If possible can you please provide some insight there.

@ProfessorInventor 3 года назад

I also have made a shadow detector circuit. You can also watch it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-f1Seudbs5F8.html