LDR and LED Circuit design - Solid State Relay

How to make a simple solid state relay using an LED, a LDR and resistor. Shown with calculations.
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[@EngineeringMindset]

⚠️ *These videos take a long time to make* if you would like to buy Paul a coffee to say thanks, link below: ☕ PayPal: www.paypal.me/TheEngineerinMindset Channel membership: kzbin.info/door/k0fGHsCEzGig-rSzkfCjMwjoin Patreon: www.patreon.com/theengineeringmindset

[@nikolas8741]

Please bro make a video about transferring router data over LASER orLED

[@kamal92606]

👍👍👍

[@johnson6048]

These videos are absolutely fantastic. I wouldn't change a thing about them. Easy to understand, straight to the point, proves the the design with proper calculations, all in under five minutes. I'm buying you a coffee right now!! Then, coming back to finish this video and share it with my 13-year old son.

[@amitp05]

I liked the practical demonstration along with the animations. Thankyou

[@EngineeringMindset]

Glad to hear

[@nikolas8741]

This is awesome !💯

[@TangoIndiaMike144]

Yea I felt like I was watching a Ben Eater video when he pulled out the breadboard. Awesome format!

[@jhana.2023]

The best explanation of LDR I've ever seen on YT. Showed everything about him. It left nothing to be said. Thanks for the perfect job !

[@JjMn1000]

Very cool! Very informative design on how an optocoupler works.

[@NickElectronics]

It is worth mention applications of LDR. Camera light meters, clock radios, alarm devices (as the detector for a light beam), nightlights, outdoor clocks, solar street lamps, and solar road studs. Photoresistors can be placed in streetlights to control when the light is on. Thanks!)

[@EngineeringMindset]

Seen our new video on HOW SOLAR PANELS WORK in detail kzbin.info/www/bejne/j6nXaGWXec95nbs

[@TopGPilot]

Always something interesting to learn from you, I swear lol

[@mohammedalshrief532]

Very accurate machine learning iron station pid control😎

[@MrLee-cy1pw]

You sir are a blessing to the internet.

[@mybrainlearningchannel968]

The first thing came into my mind on LDR is long distance relationship.... By the way Sir, this is the best channel I've been watching since I started working in building facilities... I consider this channel as the most informative video tutorial channel when comes to building equipment and other devices....

[@user-gf9kt4in1f]

Thank you for explaining and showing animations, I'm delighted😉👍👍

[@afrosaratoga2572]

This is very interesting. I didnt know what a LDR was until today but the example you've shown reminded of me how Optoisolators works. Useful to protect expensive equipment in case of a Overload on the output side.

[@starmc26]

A lot of electronic decorations have built-in LDR's ... You can find them at the dollar store.

[@TOMTOM-nh3nl]

Thank You

[@mohammedalshrief532]

Very accurate machine learning iron station watch it and see how difference science integrate💝💝💝

[@circadevices]

You wouldn't happen to know which LDR you were using? These values are exactly what I'm looking for. Thanks!

[@okithdesilva7644]

Hey Paul thankyou so much for this video

[@PampostReturning]

Thank you.

[@user-fc3fk1sg7l]

thanks💎

[@sibashishmishra6319]

I m very much enthusiastic about engineering . So I made a bench type drilling and screwing manual machine..

[@AhmedOsman-sy9jg]

While i was looking for videos to learn electricity i never find better than paul 80% of my electric basic informations is from him i will remain thankful and supporter

[@EngineeringMindset]

Glad to hear!

[@Electronzap]

Fun circuit :) Well explained.

[@jhana.2023]

Your videos are very...very...very good!

[@legendghost4277]

Best chanel💚💐

[@sudheerkumar5966]

Very good sir

[@digimon916]

Interesting. Im into cars and have been installing and conceptualizing all sorts of security measures into 90s/older cars (chips, rfid, etc). Would be interesting to use a light based "key" in a security system bc we dont usually associated a light as a "key". Or use it for just 1 part of security system.

[@starmc26]

Wouldn't be a "key",but just a switch or aux switch in order to power a secondary system, or supply a ground....for systems such as the ignition.

[@suriyasuriya5903]

Super excellent pls pls continue

[@nktrendings816]

Good

[@jyojycorpuz5834]

Interesting 👏👍⚡⚡

[@danielbarbosa3]

2:40 What I believe is the correct way of calculating the necessary resistor to implement in our circuit; we should first determine what is the voltage drop across the 70 Ohm LDR, first: [LDR] V = R x I = 70(Ω) x 0.02(A) [LDR] V = 1.14(V). Now that we have found what the voltage drop around the LDR is, we can calculate the voltage drop that needs to take place in the Resistor we are trying to find. We subtract all the voltage drops from the original 9(V) battery: [Voltage drop from the required Resistor] R(V) = [Battery/Total] 9(V) - [LED] 2(V) - [LDR] 1.14(V) = 6.86(V) Now that we now that our Resistance will give us a 6.86(V) drop after we implement it; we can calculate what actual resistance (in Ohm) it will consist of: R(Ω) = 1.14 (V) / 0.02 (A) R = 343 Ω. Am I correct, or am I missing something?

[@EngineeringMindset]

Check out NEW resistor video, everything covered! ➡️ kzbin.info/www/bejne/eorGfXl-nLt2pJI

[@EngineeringMindset]

Seen the new LED explained video? so much detail covered! kzbin.info/www/bejne/hWmwY61ona6Vl8k

[@rhgulay1821]

Great content man, anyways can you do a video about transistor biasing?

[@AK-cx1pl]

Amazing

[@EngineeringMindset]

Thanks

[@philipkim7110]

Hello Thank you so much for your videos and always appreciated and you video quality is amazing!! I am starting my new job as an apprentice electrician in a month time. However, I haven`t studied any pre-trade course regarding electricity so I am trying to study the basic theory of electricity. Which playlists do you recommend me to watch before I start my apprentice so I can give an impress to my boss? Thank you!

[@fabianmof3001]

Better to be a loyal audience than the first audience. 👍👍👍👍👍.

[@Doitcreative]

Wow Really thanks for explain the ohm's law i really understand easily Thanks one's again🙏🤤😄

[@EngineeringMindset]

Happy to help

[@JbVest]

@@EngineeringMindset yeah same for me I knew what ohms law was but this visualization. And that simple math equation to figure out the resistance needed was like a light bulb in my head thank you

[@prashantmaniupadhyay6337]

Very good explanation Sir Thanks a lot Which design software you use for the Design and explaining of HVAC SYSTEM. Thanks in advance

[@joewinbpaul2056]

It works kinda like an octocoupler

[@soulshinobi]

How can we invert the operation of the detection circuit so that we can make a night light??

[@ammoniahuffers]

Great video Paul! Thanks for show people how to make simple relay with no moving part (except for... light) Also. Why you come with 9V battery resistor, instead of using 3.7V or series 1.5V battery?

[@EngineeringMindset]

Check out NEW resistor video, everything covered! ➡️ kzbin.info/www/bejne/eorGfXl-nLt2pJI

[@thomaslau8806]

Also known as Cds (Cadmium sulfide) cell

[@charanteja5638]

Please do video on ferranti effect

[@fromzerotoz]

Bạn chia sẻ rất hay, có làm mạch và video mô phỏng hoạt họa rất hay. Can you translate this to English? Just for fun. 😀

[@okithdesilva7644]

Paul are there any values when you buy a ldr like 1k resistor

[@okithdesilva7644]

@@kennmossman8701 Thank you

[@EngineeringMindset]

Check out NEW resistor video, everything covered! ➡️ kzbin.info/www/bejne/eorGfXl-nLt2pJI

[@Jasmarkelina]

Ive been looking for this. Thanks *fur* uploading in time!

[@EngineeringMindset]

Enjoy!

[@Jasmarkelina]

@@EngineeringMindset understood. Thank you!

[@mahdijoharian2731]

❤

[@LukmanSantoso13]

That is basicly an optocoupler, right ??

[@EngineeringMindset]

Correct

[@MikeDHasSkills]

So what would be the application - you press a switch to one led to turn another one on, instead of just using the switch to turn the red on

[@EngineeringMindset]

It's a relay. You control a second circuit by passing a signal, that way you protect the circuits because they are not electrically connected. You can use it for automation.

[@WoLpH]

Long story short, this is how you build an optocoupler :)

[@jhana.2023]

He explained the LDR but also explained the optocoupler! Very good !

[@ab_ab_c]

Suppose a person wants to use the LDR with ambient light to turn on a light when the ambient light reaches dusk level. How would you mod your circuit to make that work & to minimize power consumption when sunlight is present?

[@EngineeringMindset]

voltage divider resistor/ldr feeding base pin of transistor

[@TheDeadKingsRaven]

Inverting the ldr output could do this as well.

[@EngineeringMindset]

Check out NEW resistor video, everything covered! ➡️ kzbin.info/www/bejne/eorGfXl-nLt2pJI

[@Neishy4AGTE]

What is the usage case for this?

[@EngineeringMindset]

Solid state relay, electrically separates two circuits but allows signal/control to transfer between them

[@prililacreatore130]

I thinked this relay some time ago. Just recently i know that's alrady used. 1 hours ago!.

[@j3en534]

You can make a circuit to turn the light on and off if you use one of those resistors and a transistor as your switch

[@EngineeringMindset]

Check out NEW resistor video, everything covered! ➡️ kzbin.info/www/bejne/eorGfXl-nLt2pJI

[@j3en534]

@@EngineeringMindset Looking forward to it, trying to work on my AET and these videos really help with the fundamentals

[@orsoelectrons]

Nice engineer i wish to my channel is like thuis more more power

[@nowheremanjk8624]

You make optocoupler

[@mawsoulmahadi9994]

Can you please do a video explaining the build of an FM transmitter? It should be as basic as this pls

So effectively you made a optocoupler from ldr & led. So you now can replace them with a single component instead of using two. 😉

[@mohammedatheeq188]

Hey there please make a 220v ac to 30v 10a dc power supply qithout transformer, please

[@khelifinouredine1842]

System autocopler

[@planker]

more, more, don't go away, get back up there.

[@StrsAmbrg]

What is the meaning of "Solid State Relay" in your title? Which one do you referred as solid state?

[@EngineeringMindset]

No moving parts

[@StrsAmbrg]

@@EngineeringMindset I see. Thank you for your reply.

[@sibashishmishra6319]

First view from a kid

[@dineshramakrishnan6566]

Optocoupler

[@0Bariq0]

Good video, high quality. But i got some notes maybe to help you as feedback. This circuit uses more current than optocoupler, aswell as components. I think you shouldve made a video regarding optocoupler, you spent time explaining basic omhs law, but made a video about using ldr as optocoupler. Hope u see what im saying in good will. Just pointing out the flaw

[@EngineeringMindset]

We have covered how optocoupler works and how to build a circuit with an optocoupler in previous video. This is a simple circuit, just intended for fun learning, not to replace an actual optocoupler component

[@chelseastramel3549]

I preface this comment with, I literally know nothing about all this cool stuff. My ADHD took me down a hyper-fixation rabbit hole learning about circuits on KZbin, and now I have a question that might be silly to those of you who actually understand all of this... but... Can the LDR be a self-sustaining circuit? Meaning, if the light has a two-way switch, and one of the switches is an LDR opposite to your example (light on=LDR lets flow through instead of resisting), could the second switch turn on the light but then when that same switch goes to the off position the light would stay on because the first LDR switch is triggered by the light? LOL please help! I can't rest until I answer my weird hypothetical, but I don't know enough to google the right words...

[@almikntolkein7489]

Paul am i missing something? Where is your intro?

[@EngineeringMindset]

Dropped it, straight to the learning.

[@swen5648]

More like a " Optocoupler " .

[@realestateservicessaleshea99]

🥃🍺☕🙂👍🏻

[@ingenium2229]

Please make a plasma arc speaker using flyback transformer.

[@ingenium2229]

can you please design a flyback driver circuit?

[@akmangoes7745]

How Doe's work mini Air conditioner PCB.

[@c0deman057]

*Secretly wiring the two circuits together under the electrical tape off camera like all the other free energy videos... muhahahaha

[@okithdesilva7644]

I bought a ldr from the electronics shop but it didn't work

[@userou-ig1ze]

shouldn't this be titled 'how to make an optocoupler' or how do they work

[@Hacker-at-Large]

Weird. Never heard the term “LDR.” “Photo-resistor” is what I’ve always heard.

[@EngineeringMindset]

Check out NEW resistor video, everything covered! ➡️ kzbin.info/www/bejne/eorGfXl-nLt2pJI