Arduino Tutorial 25: Understanding Photoresistors and Photo Detectors

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In this lesson we learn how a photoresistor works. We look at the solid state physics that allow the resistance to change with changing light levels. We then make a simple project where the arduino switches LEDs based on whether or not there are lights.
You can get the kit I am using for this series at the following link:
amzn.to/2I7N4Ek
Also, you can get the Mastech Digital Voltmeter I am using here:
amzn.to/2Ks9nHN
You can get more details on this lesson at our WEB site HERE:
toptechboy.com/arduino-tutori...
[Disclosure of Material Connection: I am a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. This means if you visit the link and purchase the item, I will receive an affiliate commission. Regardless, I only recommend products or services I use personally and believe will add value to my readers.]
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9 июл 2024

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Комментарии : 960

@ramenthief1686 3 года назад

Please don’t ever stop explaining how things work!

@kartikeyaandmayuresh9559 Год назад

yes your videos are very educational

@DJL7777 11 месяцев назад

True that! Love the explanations. Helps to truely understand what is happening

@Bob-zg2zf 4 года назад

35:48 "a lot of hate?" No. Math, physics are the core of our computer science. People should feel proud to master them.

@shashikanthb 4 года назад

true

@rexbarr_5783 4 года назад

I believe this is computer engineering as opposed to computer science; computer science is software and algorithm based, where as computer engineering is more hardware based. They don't regularly teach this in Computer Science programs-- which is why I'm here watching these videos.

@prashantgunjal5566 4 года назад

very true it is important to learn what is undrethe hood'

@this_is_mac 3 года назад

@Alexander Kloeden There are always people in a hurry. They don't want to make things instead of learning how it works

@anantchandak9574 2 года назад

@@rexbarr_5783 yeah computer sci include apps web dev etc etc and computer engineering is full of robotics and all things but sometimes in computer sci, when you will learn python opencv you will see phy and math are also useful in computer sci opencv is a module of python which help us to create real world application like face, hand detector

@lhouse19 4 года назад

Great Lesson for someone who wants to learn the nuts and bolts , glad you are not changing your teaching style for the haters.

@midnightrizer 4 года назад

I could hook up circuits all day long from Scematics have done that since the 80s i am here to learn the math of the electronics and the control aspects that the programming allows. if they do not want the math and all and just want to hook up a circuit they can use a simulator but anyone can do that the understanding is how you build one concept on the next to build a complex circuit. ok rant over.

@prashantgunjal5566 4 года назад

ther r more lovers than haters if he changes his style the lovers will turn haters n the haters will turn lovers resulting in the loss of paul ;

@misterdecaro 2 года назад

Lol, not only is he carrying on his most excellent lessons, he is calling the haters out in a humorous way; sorry there is going to be more of what you hate....love it.

@coreykennett8572 Год назад

The Physics and Math part of these tutorials is my favorite part. Good on you for trying to educate the masses.

@electricalengineeringbymik3603 6 месяцев назад

2024 and this is still the best series ever.

@elitezend 2 месяца назад

not really another series on youtube

@dannyjenkins71 Год назад

Please do not stop explaining how things work. This is what makes your videos so much better than others.

@alfonsld7684 3 года назад

Please, never stop doing the math and phisics!

@tedparker640 2 года назад

yes!!! PLEASE don't stop doing the math and physics!!! It's awesome to understand the why as well as the how!! keep it going Paul!

@mattbaker8791 3 года назад

the fact that you explain things in depth is the reason Im learning arduino from you

@Thejbelow Год назад

Same. I went through the elegoo kits "lessons" and they were basicly code with zero explanation or expansion. Love these explanations.

@S24W2 Год назад

Who the hell gave you hate over explaining this stuff? Please do not stop explaining these things, it's great, thank you so much

@jgrove197 Год назад

i dont know who is complaining about how you are explaining how things work, but those explanations have helped me exponentially

@samueltheprogrammer6145 Год назад

I did not complain either. I am glad Paul made these tutorials just like he did. Samuel

@Ron-he6rm 2 месяца назад

PLEASE don't stop teaching the way you do! understanding the hardware and math is infinitely valuable!

@tabmaryland2333 4 года назад

I appreciate you "teaching us how to fish"!!!

@shashikanthb 4 года назад

true

@andrewwalker9502 3 года назад

The time spent explaining how something works is well spent. I've worked with too many Engineers and Managers that get lost because they don't have a basic understanding on how instruments give them information an how that is transformed into a measured value of what you want. Knowledge is worth something and is critical when you have to rely on subcontracting or purchased services. Please continue to explain things. Even when you know the subject matter there's something to learn from different presentations.

@sauravujjain95 4 года назад

As someone who has spent most of the quarantine time re-learning electronics and researching for a wearable startup idea and falling deep down the rabbit hole of RU-vid electronics tutorials, your content and presentations are just incredibly good and one of the very best out there! Kudos and massive respect to you Paul!

@aungphyokyaw4475 5 месяцев назад

We do not hate when you explain how things work. Instead it is more interesting to me. Love your lessons.

@dennisrice456 Год назад

Prof McWhorter, You're doing a great job. Those that are not writing nice notes are not willing to learn and do the work.

@TheHeyDood 2 года назад

Learning this without the background math is like learning to drive in a car with no engine. Keep up the good work ! - Former Special Ed math student, turned engineer....turned Healthcare worker.

@donthomas9669 4 года назад

Please do not change your teaching style. I love that you take the time to explain everything and show us the math. I went to DeVry for the electronic technician program and Im using this as a refresher as well as a hobby, and i'm relearning everything as well as some things for the first time and its all because the hard work you have done. Thank you!

@dubrocadidier4583 2 года назад

There is so much joy and motivation when the homework is done correctly.

@e65bmwdoctor 3 года назад

Don't Stop on the physics. I love learning on the fundamentals of how electricity works .

@michaeldalfonzo3912 2 года назад

I, for one, really appreciate that you are giving us the background and the underlying physics and math so we can understand what we are doing and why it works. As Taylor Swift says, haters gonna hate. Ignore them, I'm sure I'm not alone.

@shuttlepodone1707 4 года назад

Another fantastic lesson and I love the math and physics descriptions that really make these lessons sink in so I have an idea of what is really happening. After this lesson, I view my outdoor lights that come on each evening as it gets dark in a very different "light". I very much enjoy the challenge when you give a "homework" assignment so I can test myself; otherwise it is too easy to get complacent and just copy what you type. Thanks again!

@berryblades Год назад

don't stop the explanations please, they are gold dust, its one thing to write the code, its a whole other level to understand why it physically works. The in depth component explanations are a big part of what makes your videos great!

@chrisperrott8781 4 года назад

Hi Paul, Chris P here from across the pond. Re your comment about not going into the workings behind the code and how the semi-conductors work. PLEASE don't stop the explanations and the maths. I'm a member of the silver topped generation that left school and college long before semi-conductors were even thought of. I can still remember the first electronic calculators coming into the office. Before then we had slide-rules and logarithm table to calculate with. I am finding the world of electronics and programming facinating the way you teach it, so please keep going with the present format. Power to the iced coffee. Chris P.

@robhallquist1140 4 года назад

Just for reference, my favorite parts of your videos are the those where you explain how things work.

@Bob-zg2zf 4 года назад

In the book "Think like a mathematician" by the German math PhD Christian Hesse, he wrote that the ancient mathematician Paul Erdos loved and drank lots of coffee and Erdos said mathematicians turn coffee into math principles". I thought this was interesting and reminds me of your trademark "Pour yourself a big mug of coffee." So I'm sharing this. Lol

@ericwright5271 4 года назад

Bob Paul Erdös lived until the end of the 20th century. Hopefully that’s not what we’re calling ancient these days. Also, in addition to turning coffee into theorems, he was said to use high grade meth amphetamines for the same purpose. He was certainly an iconoclast.

@rexbarr_5783 4 года назад

"...Iced coffee." ;)

@zackhenderson2392 2 года назад

@@ericwright5271 Weird, a distant cousin of mine does meth, and now he's an idiot with no teeth.

@akshaysuriya6784 2 года назад

@@zackhenderson2392 That went dark real quick...

@toolooselowtrek7523 Год назад

Paul, your attention to fundamentals is foundational. You make the deep magic transparent.

@gilnasty82 2 года назад

I can't for the life of me understand how anyone could hate on these lessons!! Your teaching style has got to be one of the best I've ever experienced!! Haters gonna hate I guess!! Don't let the haters bring you down Paul, you're doing an amazing job with these lessons!! THANK YOU!!!

@heidobito7924 4 года назад

You are the best teacher

@mikael5914 4 года назад

Paul, you're explanations are awesome. This is one of the rare series where people learn what's behind all of this stuff. You might not need all the background information for your projects but knowing this stuff, those details, just makes people better at what they do. I hope you keep going! Greetings from Belgium.

@bethel5414 11 месяцев назад

I don’t think I’ve ever thanked you for these videos. Thank you! And don’t stop explaining how the devices work🤲🏼

@dannycollins5698 Год назад

It was so much fun showing my wife and 4 boys. I got to show them the green and red LEDs and how they light up based upon the code, the readout on the serial monitor, and got to explain the circuits and the readout pin. Thank you

@paulmcwhorter Год назад

That is awesome!

@timothy1024_ 4 года назад

Paul, your video's are very articulated, greatly appreciated. My 10 year old boy has learned a lot from you.

@rudyfierro1221 4 года назад

Paul, I have been following the entire series since you released. You set out to be NEW and improved, you have done just that, by breaking things (concepts) down, excuse the term "Potato Head Style" , a true meaning of 101 Beginner. I'm diesel technician that set out to learn the Arduino programming platform. The background is great on the physics and math. For those moaning and griping , they need to look elsewhere, a more advance series on RU-vid perhaps. Maybe Paul will release a more advanced series in the future. Your 101 (Beginner Series) is Great. Thanks in advance for your current and future efforts. Looking forward to the rest of this series.

@favesongslist 4 года назад

LOL, Check out Paul McWhorter awesome introduction to AI on the amazing Jetson Xavier ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-83WEPcDJky4.html to have your mind blown to where he takes you. BOOM.

@toolooselowtrek7523 Год назад

You gotta do whatever the job requires. Good on you, Paul!

@flipper556 Год назад

I cant remember which lesson(s) you said you'll have to teach us how to read resistors, but I find reading them on a multimeter, A LOT easier on the eyes. BOOM!

@doughibberd1576 Год назад

Keep the science coming, I cannot understand anyone not wanting to learn.

@jesser42 4 года назад

I used this video and made my own project with an RGB, photoresistor, and a servo. Depending on the color of the RGB the servo points to the correct color. Super helpful lesson

@Rtech98 4 года назад

As a Junior in EE, I have found this series extremely helpful. Thinking of making a temperature sensor or using the joystick module to control a fan to put as a project on my resume. Great series of lessons!

@dysfunctional_vet 2 года назад

when you build this, i would appreciate if you publish your paper, a link so i can read the abstract. i am doing exactly the opposite. i bought a toy windmill, (a real toy) with comments it could not charge a battery. i do not think the thing even develops the amps to overcome the internal resistance in a battery. that is why i'm taking this course, to publish a youtube video on battery charging and wind turbines. my degree is IMET, and i have training as a wind turbine tech, trained on the big wind turbines you see on the side of the road.

@xelamortsyn 2 года назад

Hi Paul! I know this is an older video, but we are watching these lectures for our class! I have to watch through lecture 40 by Wednesday so today I followed your advice and had an iced coffee to refresh myself while working. Thanks for the great videos. The past 25 have been fantastic. Cheers.

@paulmcwhorter 2 года назад

Excellent!

@user-iw9it7pg8z 5 месяцев назад

after 4 years I arrived this video you are great Pual thank you man!!!

@polymangler 3 года назад

great lesson, love the depth and theory you go into. It allows us to get a whole understanding of what we are doing

@Cizada2968 4 года назад

This was a really interesting lesson. I personally like the maths and physics part, because it helps me understand what's happening inside all those wires and it is than much easier to be able to do the things on my own.

@stefannilsson7692 4 месяца назад

It helps a lot with your nice calculations and diagrams, sometimes it's hard to keep up, but after a while it gets better. Thank you so much for the nice oak vasions

@damoffat 3 года назад

Hate? Don't people know that stuff just bounces off experienced high school teachers?! Enjoyed it again, thanks Paul.

@Bob-zg2zf 4 года назад

What a *wonderful* explanation on photoresistor! So clear. So precise. So simple. The math of it? It separates Paul's video from other "popularization" type of RU-vid videos that don't touch on the math behind the science.

@als.4568 4 года назад

Another “most excellent” explanation, this time on how photo sensors work! Not to worry though about those who seem to think their head hurts when learning. They will eventually find work asking people “do you want fries with that?” (If they are lucky!

@butchmichaels69 Год назад

Confidence level is higher every lesson.Thanks!

@paulmcwhorter Год назад

Very good!

@hedgewicksattempts Год назад

Homework was successful! Understanding why the components do the things they do, helps immensely. I even exclaimed "No! We don't use constants!" when you put the 350 for the lightVal.

@fetchfooldin3252 3 года назад

I'm actually going through your playlist, and I enjoy learning more about this ^_^ Thank you so much for your hard work, aaand I've done the assignment and it went perfectly well !!!!!! Thanks teacher ✌🏻

@robert112uk 4 года назад

Had trouble with this homework because I forgot my pinmodes! duh! Afterwards it worked fine.

@davidlee9924 3 года назад

i used a while loop instead of a if statement, but finally figured it out 😂

@pboston6RR 2 месяца назад

Thanks for taking the time to explain the nuts and bolts of stuff. That leads to people that are able to expand their projects beyond the lesson experiment. I have been playing (self taught) with micro controllers and simple electronics for 12+ years and still watch your stuff because you do things in a different way than I have done it before. There are multiple ways of doing things and no one way is the “right” way. Your explanations always reveal an alternative. Thanks! PicAxe was my first microcontroller and the things I learned there work just as well with Arduino but BASIC is a lot easier to use for beginners. I still use both but Arduino is now my go-to micro.

@christonel1685 Год назад

Hallo Uncle Paul. Christiaan here from South Afrika. Please do not take the hate comments personal. You do you!!! I think more 80% of us apricate you more because you explain and share your knowledge with all of us.

@ahmada.9372 3 года назад

I used the RGB LED with the photo Resistor. When the lights were on I programmed the RGB LED to output a purple light and when the lights were off I made it into a bright white light! I am doing all of this all thanks to you, Mr. McWhorter!

@ultimatechird8318 2 года назад

Your homework is the only homework I don't procrastinate on. You're an amazing teacher love your work, keep it up

@paulmcwhorter 2 года назад

Wow, thank you!

@stewartmcewen Год назад

I can't believe anyone complains about a teacher explaining in depth how something works.🤦 Don't change, great tutorial series.

@barryhibben8665 3 месяца назад

Whatever happens Paul, ignore the "hate mail" and continue explaining. Understanding avoids the need for rote learning. Thats something I was lousy at as a young person and now I'm old I can't remember things long enough to recall it later!!!!

@RavensHammer00 Год назад

Wow, thank you! To get the coding right the first time while your video is paused, is so awesome...even though I had to wash the dogs while the video was paused, to come back, code the micro, and see it work the first time, and to see my code matched yours (except for the pin numbers, but hey!), is so confidence building. Thank you again! And please keep up the math and physics, I can always use a refresher!

@aahannair7690 2 года назад

Your classes are way better than any paid classes! You are one of the best teachers ever!

@paulmcwhorter 2 года назад

Because I love the topic, and love people, not money.

@steveholt8991 17 дней назад

Totally agree that we need to understand the principles involved. Keep going in depth as far as you think necessary.

@Azzys007 2 года назад

For those with no knowledge in electrics and that got confused at 12th minute where he explained the need for a resistor - get yourself "Delmars book of electricity" and go through topics series, parallel and combination circuits and you'll understand why.. Book is with plenty questions at the back at the end of each topic. It helped me a lot to understand this topic. God bless you Paul for your work.

@grathado28 2 года назад

Mr Paul you're too good at this I literally can solve most of the previous lessons problems in my head and I'm combining them

@andrewstallard6927 11 месяцев назад

Don't pay attention to the haters. I am a math and physics teacher who will be the advisor to the Arduino club next year. You explanations have been useful as a model of how I can explain how these work to my students.

@paullecat1230 Год назад

BRILLIANT explanation!!! no pun intended! I'm a professor in three specialties and you are very gifted at explaining!!!

@filipuppsall-sjogren114 2 года назад

I do love how you describe how the things actually work... it makes it easier to understand now when you know that sensors are a form of resistor.

@RandyYearley-cf3qk 4 месяца назад

Thanks Paul for your lessons. I am 64 and retired and was in the HVAC sector. I appreciate you explaining how things work, because I retain information told to me if I know how they work and not just do it this way! Keep up the good work! I am enjoying very much the lessons and I have projects lined up. Can’t wait to get to the end of this series.

@deansawadzki6797 Год назад

I love the way he explains. Sometimes I don't want to see a certain item I CAN SKIP FORWORD. keep up the good work. I watch some of these over and I simply skip ahead of the parts I don't want to see again. I know this is old but I still want to rant and rave. Keep on posting the way you do. A+

@estebanbello7861 9 месяцев назад

Love the ending, "This is how you work if your an engineer". Need to adapt the engineer mindset to truly excel in this field. Everything should be seen from a physical/mathematical concept viewpoint first and then go apply that knowledge directly. Its what separates engineers from the rest of society. Not having to do tedious trial and error cases which anyone can do because we understand the why and how. Thanks for explaining everything so detailed.

@travisgillespie2819 4 года назад

Appreciate you taking the time to provide detailed explanations, drawing diagrams, and math equations. It provides clarity in each lesson. Thank you for what you do 👍

@waitajoseph1 Год назад

I have been in technical field(mostly software) for around 4 yrs. Now building my base in electronics and one thing I have learnt is that if you grasp the basics, life is a lot easier along your journey. If no solid basics, life hard, you spend weeks debugging on simple bugs arising from lack of basics and it's difficult to for you to design original and authentic stuff. It's irritating and you can even end up quitting

@taurus548 2 года назад

I am not hating your approach! Keep that balance between Physics and Electronics. Here I am 2 Years later in a Covid Lockdown, at the far-end of the Earth(i.e. New Zealand) enjoying my time spent with you.

@paulmcwhorter 2 года назад

Thanks for sharing

@MegaBlabla45 3 года назад

Honestly, this is what sets you apart from the other instructors of Arduino. By explaining the component in depth, we are able to grasp how it functions and won't have any doubts once we start using it. Personally speaking, I find your explanations really clear-cut and straightforward which has really helped throughout this course and even for my studies in uni. Keep up the good work! Screw the haters. They are just lazy bums who can't be bothered to learn.

@matthewpierson2847 2 года назад

Absolutely love your videos. My current professor only has so much time to teach and there is a foreign language barrier that makes understanding a little hard sometimes. I always watch your videos right after a lecture because your explanations go a little deeper and it truly helps me understand what's going on. So thank you for all that you do.

@nurgarciaterrassa8593 11 месяцев назад

I personally am super grateful that you explain how things work. It's super necessary for the engineering of things!

@paulmcwhorter 11 месяцев назад

Glad to hear it!

@worldww3_please 2 года назад

Please explain. People who don't want to learn and double tap a few times and skip ahead. Your work is appreciated

@daniellemccorkle6917 2 года назад

This series is awesome! Love your teaching style, knowing how things work! Thanks for teaching us this way!!

@neatmachine 4 года назад

I agree with Bob totally!!! Keep taking the time to delve into why things work!

@rosaschwank7763 3 года назад

Thank you for continuing to teach the math and physics behind each of these components! I greatly value your explanations.

@marklee08 4 года назад

BOOM! Am at half of your Arduino tutorials. Explanation is really clear ! I enjoy watching. Thank you!

@TMRu22311 2 года назад

You're doing EVERYTHING right Paul, Please don't ever change a thing. I believe the majority of viewers came here to learn how this all works and you are doing a great job doing just that. Lesson 25 and I already have a much better understanding of the Arduino, can't wait to see it all through, but will be sad when it's finished :(

@Rccrasher716 4 года назад

Love that you explain what is actually happening. Keep up the great work!

@stuartweldon8333 3 года назад

Thanks for this tutorial series, I'm very much enjoying them. The understanding content is very much appreciated and sets it apart from other copy me videos on RU-vid. I also enjoy the rewarding use of colour LED's on some projects.

@craiggrowden9450 4 года назад

loving that fact that you actually go into depth to help out the people that DO really wanna learn and not copy and past, really appreciate your time and effort thanks again

@bryankohn9660 3 года назад

I know this is a year old, but ignore the haters. I love your style, your pace, and your thoroughness. Don't change for the haters!

@christopherearl1284 3 года назад

Hi Mr. McWhorter, I did the homework and first wrote it with an if statement and then rewrote it with a while loop just to see if I could. I'm so proud of myself, thank you! I can see the MAGIC!

@1psychoticmurmur 3 года назад

I'm one who is very thankful that you take the extra time to explain why things work and the math and physics behind it all. Excellent videos.

@banyincam 3 месяца назад

I have a degree in mathematics - so I know all the math, but I'm glad to hear ALL your explanations.

@samuelguy2604 4 года назад

Thank you for these tutorials Paul! I started watching these with no prior knowledge of Arduino, coding, building circuits, or anything of the sort, and really enjoy learning the details of why and how all the pieces of the puzzle come together to make something. Looking forward to learning more!

@deelanthechicken8300 3 года назад

keep doing this content, it is literally the only really good arduino tutorial i found and im enjoying the lessons!

@MrHayko666 3 года назад

Love the fact that from what I have learned so far from your video series, I already have an idea of how to build a security alarm with a lot of functions :) thank you

@ibrarMajid001 4 года назад

I totally appreciate your teaching style. we can't gain the real concept of things without being told the actual science and maths behind them. So keep diong what u have been carrying on so far...bestowing us with the treasures of your knowledge!

@JCork Год назад

Keep explaining the how and why. I really enjoy the math and it's great knowing the reason why things are the way they are!

@abramians1 3 года назад

Great tutorial! Really enjoying the "why you see what you see" aspect of it. Please continue to include the physics, chemistry and math aspects!

@tretty07 3 года назад

Keep up the way you are going, these lessons are perfect for me, i never did physics at school so i am constantly learning from you, also my maths after leaving school were pretty basic so the way you are teaching is sinking in really well and i am soaking it all up

@erygion 4 года назад

I like the way you do things, it's why I watch your videos. I want to learn how to do it myself and I know I'm not alone.

@keelershortline2235 3 года назад

Love your style. I know you made these awhile ago, but I'm enjoying these tutorials and I'm learning a lot.

@piyush-hp9pz 29 дней назад

best arduino series in the whole youtube

@glolicotv1745 2 года назад

His tutorials are relaxing and also entertaining. Thank you for this!

@123selkirk 4 года назад

Thanks for explaining the physics as well as the concepts. Helps me wrap my head around it. Keep up the good work!!

@kevincornelia4067 3 года назад

Definitely don’t hate that you go into all the grit with the lessons, I love it! These lessons have been amazing, I’ve went from knowing nothing to knowing a lot already! I was so close to getting the coding right on this homework too😑 off by 1 word.