How to make LDR Darkness Sensor Circuit Simple DIY
Vložit
- čas přidán 20. 08. 2024
- 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.
visit for more
electricdiylab.... FB page :- / innovativemr
My Gears :-
Camera :- amzn.to/2FO4W5E
Video Light :- amzn.to/2FNKzFL
Mic :- amzn.to/2HYqBZC
Soldering Kit :- amzn.to/2FgNd8Z
Screw driver set :- amzn.to/2FkhHHm
Rotary tool :- amzn.to/2FM3Lnh This video is made for entertainment purposes only. Please use judgment, care, and precaution if you plan to replicate. WhatsApp for custom projects +91 7600079068
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 😊
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.
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. czcams.com/video/f1Seudbs5F8/video.html
@@ProfessorInventor THANK U
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.
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.
Yea, it failed o work for me too. But after I figured it out I made this video :- czcams.com/video/cFFpI2N6r8o/video.html . Haha I am certain you already figured it out but hopefully, it may help someone else.
This video was really helpful....my physics project was really appreciated 👍👍
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. czcams.com/video/f1Seudbs5F8/video.html
Make a relay circuit
I made the same project but it is not working can you tell the reason i make the same connection
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.
no
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?
@@lordmummie He should improve his circuit.
But he just used 2 100ohm resistors in parallel to make it 50ohm.... Isn’t it?
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.
The 2 resistors u have used aren't 100k they r 150k
Lol 🤣 🤣
good catch...that is guy need to work a bit harder in making a good video..
Yess!! It works perfectly
Hey guys, great video. Are you able to tell me the resistors I'd need to run this off 4.2V please?
Can we run motor in place of led
Yes
Good idea
Request help:-
My LED turns off in darkness.
For me also
Mine also
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.
LED+ to VCC and LED- to Collector
Resistor to VCC and Base
LDR to Base and GND
Resistance zayada kardo mega tak per kam karega
It works 😇
After 'n' number of times lol !
Ho
Plz frnd tell us truth because I need to implement it in my project plz
it doesn't work i try 10 times but it field
Bro, I think its a 10K Ohm resistor. If you look at the color code, its brown-black-orange-golden. brown gives a value of 1 and black gives 0 which makes it 10, orange multiplies it by 1K which makes it a 10K Ohm resistor.
You are correct.
What about golden...
The last (4th) band signifies then tolerance of the resistor.
gold 5%
silver 10%
no colour 20%
Its the difference in measured resistance of the resistor & its actual (theoretical) resistance.
Bro, the band is red not orange. This is 1k only.
The other 2 resistors are 150k not 100k.
@@esubpathan8127 golden shows tolerance of a resistor
You are a genious Engineer
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. czcams.com/video/f1Seudbs5F8/video.html
I am planning to make this my first electronics diy project
Will it work if use 20k r instead of 50k
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 we connect buzer with led
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
Bro sent the link circuit diagram
He dude it's really simple to make this kind of led.
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.
what I can when we used 5 volt battery
when u use 5 volt so change the resisitor value
@@practicallab what value resistor would he need and which resistor are you talking about? Cheers
Can i replace buzzer with dc motor? I want to make something move when the laser is cut.
Great example of how footage does not go well with music.
😂😂
What is the name of the white object in which connections are done quora???
Breadboard
but how do you remove the flicker that is caused by the threshold between afternoon to enter night and vice versa?
Please give a ac to dc converter circuit with item required with value
give us the cord
Can u explain its working wt happens
If we use small buzzer in case of led will it work?
Praveen kumar Das yes it work
it will work
dude did u used it for class 12 physics investigatory project
I wnt to add a bell also ....so how can i do it?
Shantanu Paul remove the led and put the bell or buzzer
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
Can u tell me why transistor is added
transistor work as a switch in this circuit
Circuit not working😭
it's not working ....
Thank you very much
its working bro super
Thnk
subscribe to my channel bro and share pls
Ok
Jhootha
Not really good
please show me the full schematic diagram because i wanted to make robot that will have a sensor like that
Its working
A kam kesa karata ha wo jara likh k batayo sir
Plz help meb
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.
Dont worry, 1st try it yourself.
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.
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.
It isw working!Thank you
Hlo is it really working??
i can use 56k
Can we use 100oms resistor
Help ..how can I increase sensitivity of the LDR?
Can we use 47k instead of 50k ?
try some Values, this changes the on/off dependent on your current light Level
Can i use Bd 138 tranjister at replacing of BD 140?
Help plz
You use c945 transistor
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
Is there a common emitter circuit or a common collector circuit in this circuit?
It does work for me but it doesn't go on and off it just goes on lighted up like that.... what should I do?
make sure you should have enough light to turn off the LDR. turn off your room light and use your phone torch as light source .
@@strickler453 it’s been over an year since I asked this and I don’t remember what the issue was I got it fixed and turned it in on time thankfully. Anyways thanks for answering 😄
If you notice that 50k ohm resistor will not be in the same hole it will in the the next hole
Who noticed
👇
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
Can we use bc548 transistor
what is the name of the bord in which you placed the led ,ldr etc ?
Bread board
I tried in pcb board it not working why ? Can plzz help
I have tried with 2N2222 laying around instead of BC547, and on PCB too, it is working nicely. Plz try with this transistor connected with EBC pinout configuration.
You may not have connected BC547 in right pinout configuration, for this it is CBE from left to right, keeping face of your transistor towards you.
Led is always on
Very basic very useful
Its working oppisiT ... When the room light is on the LED is also On .. and when the room light is off the LED is off ... Help me ..
me too
Will only the exact resistor will work??
Can i use 10 led?
Nice one, substituted a n2 2222 transistor and used 5v usb power supplied to a power board on the breadboard. Thanks!
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.
wow amazing i like the project, but I have tried doing it using 2N2222 transistor but not working
It does not work
I have 330 Ohm and 1M ohm
where get the board?\
so what happened
because i am confused
i did it but it doesn't work
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
Can't we simply use a LDR light sensor module, a battery and a led????
Can i use any npn transistor
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. czcams.com/video/f1Seudbs5F8/video.html
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
didnt worked.....when given supply of battery ..the led got lit up and it stays lit up if i put something above ldr.....even when nothing is put..can anybody help me with this?
harshil patel I think you need to change the resistor
Same here
May be transistor is not fitted properly
My also same case bro
@@meetcharms4287 try flipping ldr or led respectively one at a time
What will the values of resistors be if I use a 5V supply??
100 k work on 5 volt
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)
We should not use 50 K resistors in same. Point P
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.
I made it with transistor but no LDR & its still working.
I made this but not working
It is working I love your chanal
Yessss!
It's never clever to promote duracell. IT was better to use 18650 battery, less resistors. But nice job.
Thnku so much.
it doesn;t work for me so i need help
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
yes
Bro, in this project, you said that you have used two 100k ohm resistors in parallel to make 50k ohm resistor. But on video, it is showing 150k ohm resistor due to colour codes of it. Please update your video
2x100K Ohms resistors are OK.
How LDR work s
i tested something this circuit also works with an 2n2222 npn transistor!
Thanks man it works
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
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?
Sir, can i replace the led with a light bulb?
Sairon Reales yes u can
@ Sairon Reales if u want to replace with a light bulb u need to give the connection through a relay
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.
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??
Sir please reply whether 100K resistor or 150K resistor is required🙏🙏. You using brown, green, yellow gold resistor that is 150k resistor