Light Sensor circuit on Breadboard + Darkness Detector | LDR & Transistor Projects

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:

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.

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[iye]

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!😊

[superjimbo]

This gentleman is a very good teacher and explains principles of circuits well, thanks

[ranahetanshi]

I tried many times this experiment but only after watching your video I succeeded. Thank you a lot😊

[kingofelectronics]

The explanation was great i've seen many vids like this but none of them explained like u great work bro!!

[borisdorofeev]

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.

[shvideo]

Excellent video. Very educational. Thank you for covering it so comprehensively. Thank you for sharing.

[Berghiker]

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

[adityakashyap]

Great thing about your videos is you explain everything in good manor

[mukulkumar]

this video was really helpful specially the circuit diagram for the darkness sensing circuit
keep going brother

[prashantsaraswatxii-b]

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

[sudheerpodila]

Good Explanation! I liked it so much! Everything you made is working! Keep It up Elonics!

[TheNightmR]

Great thanks, this video help me to build my project

[realtrickybilly]

Nice to see you making videos again. Thank you.

[paolochong]

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..

[zarceon]

Liked and Ticked the notif bell...Goodprojectand explanation... Keep it up..

[yasseratwan]

the one that truns on in the dark was so helpfull thank you <3

[Philsheo]

You explain very well and I thank you.

[mariocta]

Ty for showing it really helped me in class

[dayasena]

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, , ,

[justbanter]

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!!