Light Sensor circuit on Breadboard + Darkness Detector | LDR & Transistor Projects
ฝัง
- เผยแพร่เมื่อ 8 ธ.ค. 2017
- 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/
Like our Facebook page: elonics/
Follow on google plus: plus.google.com/+Elonics
Don't forget to Subscribe! - วิทยาศาสตร์และเทคโนโลยี
![[MPD직캠] 베이비몬스터 직캠 8K 'SHEESH' (BABYMONSTER FanCam) | @MCOUNTDOWN_2024.4.25](http://i.ytimg.com/vi/QHf-2xSJzYE/mqdefault.jpg)
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!😊
Thank you for the compliment!
This gentleman is a very good teacher and explains principles of circuits well, thanks
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.
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!!!!!
I tried many times this experiment but only after watching your video I succeeded. Thank you a lot😊
this video was really helpful specially the circuit diagram for the darkness sensing circuit
keep going brother
Great thing about your videos is you explain everything in good manor
Excellent video. Very educational. Thank you for covering it so comprehensively. Thank you for sharing.
You're welcome
Nice to see you making videos again. Thank you.
You are welcome trickybilly
Great projects,simple to understand.
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.
You explain very well and I thank you.
Thank you for making these videos!
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
The explanation was great i've seen many vids like this but none of them explained like u great work bro!!
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 =)
@Mekhi Gary Yup, I have been using instaflixxer for since november myself :D
I am impressed to your explanation sir it's really excellent 👌🔥
Thank you it helped me every much in my school project
Excellent, simple description. Thank you.....
You're welcome
Very well explained. Thank you!
Ty for showing it really helped me in class
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.
Thanks a lot for this video... It was very helpful !!!
THANK YOU SO MUCH SIR!
You are an awesome man.
Great work sir!
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..
You're welcome. And thank you for the motivating feedback :)
Excellent tutorial. Thank you sir
You are welcome
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.
Very nice explanation 👌
IT WORKED! great vid! Thanks!
You're welcome!
great video, thanks
excellent chakri...great work!!
Thanks ra
Bravo bien expliqué. 😁
Your video is very good for learning
Aptly great explanation, v useful proctice. . Thank you Sir I'm following up. ...
Very informative, thanks.
You're welcome
Awesome video as alwazz... keep going..wish u LUCK😂
Great thanks, this video help me to build my project
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
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!!
Pefect! That's a great idea. Small automation's like this will make our daily experiences seamless.
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?
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.
Highly Appreciative..
Your project has helped me in making my project m making there reports.
Thank u for being a blind Help🍁
You're welcome!
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,,,
Creative video, thanks :)
Thank you! Feel very capable after being able to make this even if it's ot much its a start
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?
@@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
@@MemoThePanda The led is on normally, but when I put my hand on the sensor, the led does not turn off
By inserting the LDR with PIR would I still need 10k potentiometer for LUX adjustment or will the 501 potentiometer will work?
I try your IR proximity sensor circuit but it won't work. Would pls give the circuit disgram to make it easier. Thanks sharing.
How does the fact of reverse thé resistance and the ldr, make it a night sensor ?
Awesome video, I will also make and post in my TH-cam channel
Welcome back! 👍
👍
Liked and Ticked the notif bell...Goodprojectand explanation... Keep it up..
nice video
something to know
hey can u plz show how to make transmitter and receiver(ir) for wire less car
thansk for video
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
Hi, do have tutorial for this circuit using 2N3904? thanks in advance
nice video Sir. plz upload more electronics videos
Thanks, sure!
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?
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
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?
Hii
Did you make the dark sensor circuit?..I am unable to make it
Sir ,can we replace the npn transitor in the given with JFET transistor
Can this be used to trigger a relay? Im planning to make this and install it in a car without automatic headlights on.
Could anyone explain how just changing the places of ldr and resistor changes what makes the transistor work?
super bro
what with that resistor connected series with the led what should be the rated value and how can i get that
Good video..
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
Do we need any code to process ?
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?
It's working! Tnx
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?
Can I use transistor BC548 instead OF BC547 for this project?
Will this diagram work on a 12v DC light ?
Sir,how can i made the same with the supple of ac?
Can i get the circuit daigram of LDR dark sensing circuit...
thank you
How long would a 9 volt battery (PP3) last?
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!
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?
Link for circuit diagram is disabled it seems.
Please do something 👍.
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.
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?
is it posibile to change leds with a light bulb and work the same way?
Very nice....
Would this work if you used an LED strip instead of an LED
Can we plot ir sensor circuit with 555 Ic...
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)
I love it
Sir can we use this for 220V ?
Hi! I don't get the potentiometer connection. Can you please help me out ?
Can you convert the motion sensor to a metal sensor, thank you
Thanks
Can I get synopsis and report on this project
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 TH-cam about the transistors,which show us what these numbers refers.
shashwat sangle Those two NPN transistors are essentially the same, just favorites in different parts of the world. Use what you have.
I want abstract and report for this experiment
I still didnt get why the darkness sensing curcuit makes the LDR work in the opposite manner could anyone explain it better please?
How much is the total resistance of this sensor? thank you
Sir i want to use thyristor instead of transistor ,pz guide
In this light sensor circuit instead of light(LED),WE use the motor
Transistor will heat up like anything
You will need a relay or MOSFET for that
Motor will draw a lot of current which can destroy transistor
Dear brother I should use this circuit in 220V ac how to use please anyone tell me????????
Could I use 2n3904 transistor instead of bc547?
Yes you can. Just make sure you match the emitter base & collector pins.
What changes must be made if we need to replace dc motor in place of led. Should any resistance be varied.. Pls reply @elonics
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)
@@elonics its a 3-9v dc motor and transistor used is bc547 to a 9v battery
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.
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?