How to make LDR Darkness Sensor Circuit Simple DIY
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- Опубликовано: 18 июн 2017
- Sponsored by JLCPCB (10 boards for $ 2): jlcpcb.com
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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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.
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.
Increasing resistance to 2k and exposing LDR to high intensity light worked for me you can also try it
Thank you for the help 😊
Hey guys, great video. Are you able to tell me the resistors I'd need to run this off 4.2V please?
This video was really helpful....my physics project was really appreciated 👍👍
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
Is there a common emitter circuit or a common collector circuit in this circuit?
You are a genious Engineer
Can i replace buzzer with dc motor? I want to make something move when the laser is cut.
but how do you remove the flicker that is caused by the threshold between afternoon to enter night and vice versa?
hlw, bro..! i was make this circuit using LM 358 & A 3.7Volt Li-Ion cell, also used a VR 20k.(for dark control) for my 12smd (6530) LED strip. i was also use a Darlington BD039 transistor, at output of lm 358. the circuit well opereted but a problem has found, during at off position, the circuit dissipate battery charge. have you any solution to prevent from this issue ? please reply as soon as possiable.
Excelente.. pero tengo una duda que pasa si no utilizo transistor? Funcionaria?
Will it work if use 20k r instead of 50k
Yess!! It works perfectly
Can we use bc548 transistor
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.
I also have made a shadow detector circuit. You can also watch it. ruclips.net/video/f1Seudbs5F8/видео.html
I am planning to make this my first electronics diy project
Will only the exact resistor will work??
Thank you very much
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!
I also have made a shadow detector circuit. You can also watch it. ruclips.net/video/f1Seudbs5F8/видео.html
Make a relay circuit
Can u explain its working wt happens
Is it neccesary to have the transistor and resistors? Cant you just use the power, LDR and LED?
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.
I made the same project but it is not working can you tell the reason i make the same connection
Can I use diode in this circuit please tell ?
How does these resistors help in this circuit. ?
Can we connect buzer with led
can it work reversly like it will stay on till is in light and gets of when lights go out
How to use it with a variable resistor or POT ?
Help ..how can I increase sensitivity of the LDR?
Can v do with long bread board
Can i use any npn transistor
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
Can i make it without using that particular board that u have used?
Plzz reply
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
thats literally how i feel! and i dont need the music. i need the explanation behind how everything works!!!!
It is a link on description, click and you can find the schematic.
LED+ to VCC and LED- to Collector
Resistor to VCC and Base
LDR to Base and GND
Selfish
Negative. Actual video showing that it works, is in accordance to Galileo Galili's scientific method, proving that it works.
wow amazing i like the project, but I have tried doing it using 2N2222 transistor but not working
Can we use the 100k in place of 50k 2
Can we use 100oms resistor
sir whats the use of the IC you have used i think even a parallel connection would have worked.please clarify
No IC has been used in this circuit. It is a transistor or LDR.
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.
where get the board?\
will 47kohm resistor work instead of 50kohm resistor
thank you gb
Can I use one more led in series
Very basic very useful
How long will the battery last?
Thnku so much.
Can i use 10 led?
Can we take Resistor of our Choice ?
Can you make it revarce i mean when it is dark the power will go on the led
Will it work if I use 5 resistors of 10k ohm on series instead of one 50k ohm resistor ?
@ajit kumar resistor value depends on the resiatance of ldr during dark condition, it need not be 50k always
Please give a ac to dc converter circuit with item required with value
I want to use 220 V ENERGY BULB AND A DC CURRENT TO POWER IT ON, WHAT DO I NEED TO DO?
Thanks man it works
thank you
Can I use pn2222 transistor?
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?
@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
sir 12 volt pat chla sakte hain our 548 use kar sakte hain batae plz
If we use small buzzer in case of led will it work?
Praveen kumar Das yes it work
it will work
Can I use dc motor in place of led
hi thank you for this can you tell me how to get 12v power out from LDR Circuit, not 3v I want to set a siren or alarm for this
LED+ to >500Ohm Resistor to VCC and LED- to Collector
Resistor to VCC and Base
LDR to Base and GND
Can be use single resistor of 100k
Can i use bc 547
It isw working!Thank you
Hlo is it really working??
Merci !
Sir please reply whether 100K resistor or 150K resistor is required🙏🙏. You using brown, green, yellow gold resistor that is 150k resistor
Bro ithu automatic on off method ah ila intensity control panuma
where to buy resistors online? and could you explain the principle use of transistor
It is working...thank you😀
Bro for me working when light is there
@velu samy
If u r getting it in opposite conditions interchange the position of ldr and resistors
Please show full circuit drawing...
Muchas gracias por tu vídeo, podrías enviar una foto con el circuito en placa por favor?
I also have made a shadow detector circuit. You can also watch it. ruclips.net/video/f1Seudbs5F8/видео.html
dude did u used it for class 12 physics investigatory project
Thanks
Thank you so much
Its very best and easy😀
THANK YOU
i tested something this circuit also works with an 2n2222 npn transistor!
Creative video, thanks for sharing :)
yes, it works
SIBI JUDE P R how? Plzz help me
I have a sensor as showed in your description 105 rs what to do with that
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.
I also have made a shadow detector circuit. You can also watch it. ruclips.net/video/f1Seudbs5F8/видео.html
bro , for me always led is in on condition
Same here problem
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 👍
@@ParthPatel-uu9gh change the resistance bro..
I also have made a shadow detector circuit. You can also watch it. ruclips.net/video/f1Seudbs5F8/видео.html
@@ProfessorInventor THANK U
How LDR work s
please show me the full schematic diagram because i wanted to make robot that will have a sensor like that
does this work for LED strips as well?
sure, you just need a Transistor that can handle the Current.
But it would be better to get a Darkness-Sensor with a Schmitd-Trigger
It is working I love your chanal
Yessss!
Where to buy items
Can we run motor in place of led
Yes
Good idea
Sir did we use on this system on 12v battery??? Plsss give me ans fast
No brother
It can cause overload.
what is the name of the bord in which you placed the led ,ldr etc ?
Bread board
Can i use 100k resistor for it
Nice one, substituted a n2 2222 transistor and used 5v usb power supplied to a power board on the breadboard. Thanks!
vedio is Nice but I have a dougbt What is the resistance of LDR
help. the base voltage stays at 0.75v, i cant make it change based on voltage of the ldr. how do i remedy this?
try a higher Resistor-Value from VCC to Base (this is called a Pullup-Resistor)
It works 😇
After 'n' number of times lol !
Ho
Plz frnd tell us truth because I need to implement it in my project plz
How to make same thing for 220v?
Can you make a circle map?
Can you show how to do this but connected to an LED strip
very good video
Can someone explain what the resistors in series with LDR do and why they're needed? Wouldn't it work without them?
Being the ldr a resistor itself, it will form a voltage divider when associated in series with a resistor. Less ambient light, higher will be the ldr resistance, so current will flow to the transistor.