How To Make A Dark Sensor On A Breadboard [HD]
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- Опубліковано 9 лют 2025
- A 'Dark Sensor' is a device which senses the presence of darkness. It senses the presence of darkness with the help of the LDR. Whenever light is focused on the LDR...the L.E.D will not glow. As soon as you cover the LDR or keep the dark sensor in a dark room without lights...the L.E.D will glow.
It can also be called an "Automatic Street Light" Circuit since the L.E.D will come "on" after sunset i.e when it becomes dark and the L.E.D will turn "off" during sunrise because there's light! 💡
Electronic Components Required:- LDR (Light Dependant Resistor), L.E.D (Light Emitting Diode), 100k ohm resistor, 9v battery with battery clip, BC547 Transistor, Breadboard and some wires.
First connect all the elements on the breadboard to check if it works and then you can solder it to make it permanent. You can even attach a switch to the "Dark Sensor" to turn it "ON" and "OFF" when required.
Steps of construction:-
1.Connect the LDR to the 'base' and 'emitter' of the BC547 transistor.
2.Then connect one end of the 100k ohm resistor from the 'base' of the BC547 transistor and the other end of the 100k ohm resistor to anode (+) side of the L.E.D.
3.The cathode (-) side of the L.E.D will get connected to the 'collector' of the BC547 transistor.
4.The positive (+) side of the battery will get connected to the 100k ohm resistor and anode (+) of the L.E.D while the negative (-) side of the battery will get connected to the 'emitter' of the BC547 transistor and the other end of the LDR.
IF YOU DONT UNDERSTAND THIS; MAKE SURE YOU WATCH MY PREVIOUS "DARK SENSOR" VIDEO'S
LINK :--- • How To Make A "Dark Se...
LINK 2 :--- • How to make a "Dark Se...
LINK 3 :--- • How to make "Automatic...
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I have explained the circuit construction on the breadboard. Once you get the circuit right you can solder it to make it permanent. Your "Dark Sensor" is ready. Any queries then please do ask!
Thanks for watching. Don't forget to like/subscribe/comment/share. 😊✌
Thank you very very much my project submission was next day
Thnx so much
😅😅
Best explanation
Thnx
Fully working project
May Allah bless you man. I am working on a lab I have to demo tomorrow morning, and I came across this. Thanks Very Much. You don't know how much I grateful for you.
Deserved Subscription and Like!!!!!!
Tq so much this is the only video working in the UA-cam
I got full marks in my project by doing this
Tq so much
Tq very much
Really thankful
Wow that's amazing! Congrats! I'm glad you found my video useful! 😊
#pleasesubscribe
This was the most easy and simple circuit I’ve seen so far and one which works too. Thank you so much. I hope my viva goes well tomorrow. 😊
it turned into light sensor...miracle😳
Yes
Yes
Superb and clear English pronounciation 👌👌👌
Thanks, mine works but it only turn off in natural sunlight. Great work!
mine too
Thanks dude, your work is the best life saver👍😂😊
Perfectly works... thankyou so much
Thaks this works. Great explanation. ❤from sri lanaka.
I am a beginner, at first it didn’t work but since I use arduino I realized it has to go from negative to positive because your using a battery and it worked!
Edit: I mean like I didn’t realize I was putting it wrong I know it goes from negative to positive
So far The only Circuit That Worked Thanks Dude Life saver
Good i make it, its working. Thankyou
Literally , this was the most compact version of light sensor in the youtube
I like and ue is very good people. Thanks
very clearly explained dude.....and i could understand very well...keep it up bro!!!
Thanks bro! :)
@@TroyAraujo sir is circuit ko on off button kaise laga sakte Hai???
Please reply me sir please 🙏 🙏🙏🙏🙏🙏🙏
@@TroyAraujo please help me sir
Yarrrrrr apnay ne hmari zindagi badal di
Thanks Troy Araujo, you make it fun to follow for beginners with a nice calm voice. Just what we need. Keep going my friend.
hey this helped a lott but do you have the circuit diagram for it ????? cause i need it desperately.
thank you for this informative video !!
well done bro........it's working Vera level .......👍👌👍👌👍👌👍👌👍👌👍👌👍👌👍👌👍👌☺☺☺☺☺☺
Thank you simple and it works
Will rock this one
U r d best..i made dis..and its properly worked
Thank you so much!!!
Thank you so much, it worked for me!
thx for the circuit!!!
Please do make more simple videos like this.
It is working thank you
Thank you for the tutorial!
Good Bro Excellent work bro .....helped alot
Can i use a 12v battery and 12 v led instead of 9v battery and led
Yes
Thanks bro it works and amazing
This channel is amazing
I've seen many videos on this but no one explains why you use the 100K Ohm resistor. Can you explain?
True, when I had only 1k, it didn't work. When I replaced with 100k, it worked perfect
I have seen many videos..this is the best..worked properly
+MALVINDER SINGH Thanks bro! ☺
Well done Professor
Thanks ❤
please put an video on how to make an automatic Street light control system....
+David Don Hey bro! I've already made a video on Automatic Street Light.... You can check it out here :- ua-cam.com/video/c0bsQer6KTs/v-deo.html
Tan q u a lott .............. itz working well... u gave a very good explanation once again .. tq
Exercise is exeelant. Thank u Sir. ..I'm following u👍
I have a 270ohm resistor and a 1k ohm resistor. Will it work?
well done, simple and it worked
when doing like this, can I use a 5V battery?
Merci mais est ce que tu pourras le faire avec un buzzer
100% Working!!
How
Tq it's 1000000000000000 percent working 😂😘😘😘😘😘😘😘😍😍😘😘😘😘😘😘😘😘😘😘😘😙
It worked for me ... Thank u
Hi! Can we more than one led and if so how to connect them
Bro do the clap on off switch circuits in bread board
Hiii i actually tried this and it was very helpful but it also lights up even when exposed to light i dont know whats wrong.
Me too. Why huh?
Thanks a lot...this video is really helpful. Thank you 😊
Plz explain the theory why this system works in dark and why not in light condition....??? Plz tell.. i have to analyse my teacher...🙏
Sir isko on off button kaise laga sakte Hai????
Plz reply me please it is urgent
You will have to connect a micro switch. Watch this video to understand 👉ua-cam.com/video/rdhebFue4CY/v-deo.html
Fantastic😍😍😍😍
Electronics students attendence lagao 😅😂
Hello, I used a resistance of 22 and a voltage of 5, is this correct Because it didn't work for me
Thanks bro it was really helpful. 👍
Can I get a circuit diagram of it sir ,, please reply fast
I made all of the connections and made with the same components, and it is working the opposite; when light is on it, it lights up but when the light is off, it doesn’t light up, can you please help me quickly
Thank you
I figured out that I was putting the cathode of the led in the base, but when I plugged it in the collector it didn’t work at all
Please answer me
Thanks a lot 🙌this video is really helpful. Thank you 😍
it works thanks bro ....
When i try first time it work proper but when i made second time infront of my brother it work reverse ie, on light it glow brighter and in absence of light it glow dimmer
WELL DONE MY BRO
+Rohan bobby Thankyou! 😊
Will it work without the transistor? I have seen simple circuit diagram without the transistor consisting just a battery, wires, a resistor, LDR and LED
I have a 1k resistor can it still work
Can a photodiode replace the photo resistor?
IF NOT CAN YOU PLS SHOW ME HOW TO MAKE A SMART STREET LIGHT USING LDR
+Rohan bobby I have already made a video on Automatic Street Light. Watch it here :- ua-cam.com/video/c0bsQer6KTs/v-deo.html
thx bro
It's working tq sir
can you please provide the circuit diagram for this dark sensor??
What is the concept or working of this circuit ,can any one explain?
Nice.
Which type of LED used in this circuit....can anyone help me out....I'm stock on this😞
Can you send the circuit diagram
bro light is glowing even after putting it in front of light
You need a higher resistance
why mine not work???....mine when in the dark its not ligh...when in light its not light... can you help me?
Very nice
Well done & explained.
+Ram Prabhu Thank you!
can we use any breadboard ?
Yes
CAN I USE THIS FOR MAKING A SMART STREET LIGHT...FOR MY SICENCE FAIR BRO
+Rohan bobby Yes sure bro! Good luck with your science fair! 👍
thx bro
can I make by 1k
cool this woked.thanks a lot.
plzzz reply iwhat resistor i have to use 100k or ohm plz tell
Why are the positive and negative wires of the battery connected both to negative
My circuit is not working properly, as my led is switching on as soon as i connect my battery, i dont know why ldr is not working or there is anyother problem. Can anyone please help me with this?
can I use 1k resistor instead of 100k resistor
Sir can you please provide the circuit diagram 😒
Bro! Thanks a lot!! This saved my life!! God bless you bro!!!
I tried to make this but got only a voltage diff of 0.02 V bw the led pins in light and dark.
Even tried 2N222 but nothing.only 0.2 V diff.
I used
BC557 and changed the polarity accordingly
Moreover my LDR works kinda weird
It is 0.5 M Ohm in light
And 0.3M Ohm in dark
Is it possible??
I even tested my multimeter and found it to be working correctly.
If 3v battery then we use what value of resistance
Will bc 546 transistor work ?
12v se connect kr ke,12v ke led ko automatically on off karne ka circuit digram bataye, kitne power ka resistance lagega,please
Mines not working, LED is ON but it doesn't turn OFF in light
Likewise its just turning ON
it's working totally reverse what can I do
Same
Thamula - It may not actually be reverse. Try shining a bright flashlight on the LDR to see if that turns off the LED. If the LED turns off, you created the circuit correctly.
I have tried SEVERAL “dark detector” circuits, and they ALL have this problem (at least for me). I am going to try a 100 K potentiometer in series with the 100 K resistor to see if I just need more resistance in the circuit.
Please let me know if the flashlight turns off your LED. Good luck!
Thumula - I replaced the 100K resistor with a 680K resistor, and now it works! The LED still has a VERY small illumination in a dimly-lit room, but the LED lights up perfectly in darkness. I may try a 1M resistor to see if that helps.
so 100k ohm doesn't work? my circuit worked the last time I did it, but it is now reversed.
Check the ic polarity
Tnx for this video
i want to use one more transisitor to attach more leds so can i
can anyone give me the circuit diagram?
i have 912 bc547 transistor and can it make this transistor???????
It cannot work for me the lightis on condition for me what can I do
can u please upload the circuit diagram of the dark sensor in which we used only 100k ohms resistor
I do not have an 10k resistor. Can i use some other value resistor
+Deepak Prajapati Don't use 10k resistor....use 100k resistor!
Troy Araujo hello i use 100k but it not work
very good
May i ask for the diagram of this? Thank you