YT is pure gold as long there are people like you explaining stuff.

Mister Barnett, I must say that I've never heard the concept of pull up / down resistors explained so clearly and concisely. Very well done. You have given me an idea on how to build an alarm system to see if anyone has opened a door or window remotely and to activate a video recorder to stream the output to my smart phone. Now all I have to do is to figure out the streaming bit to my phone. Thanks.

That might be the simplest and clearest explanation of pull -up and -down resistors I've come across.

Wow, wow, wow, just wow. I'm blown away by how clearly, thoroughly, and yet concisely you are able to teach. I probably gave you a thumbs-up when I first watched this video, but as I watch it again for review 5+ years later, I'm just blown away by how great of a job you did on this one. Thank you!!

I like your teaching method of suggesting the simplest solution and patching its shortcomings, like what you do for pull-up/down. Very effective. Good work!

Best explanation I've seen yet. I was seeing those terms like "pull-up/down" in the kits I was working with and struggled with understanding the problems and risks.

This is brilliant, thanks for the guide! As you say, all sorts of projects could be derived from these!

Heh, Thank you, I never truely knew what floating was in my undergrad, I just knew the pins had to have a pull up or pull down to complete the circuit. I never thought of the protection! You explained it with a circuit and that I can understand. Thank you.

Thank you. I'm fairly proficient with Arduino's and electronics. I've been looking for some straight-forward examples of using the Raspberry Pi as I would like to harness more powerful boards. Many videos waste lots of time talking about irrelevant things; you've cut straight to some actual examples and it's absolutely brilliant. Subscribed!

This tutorial rocks. Thanks! GPIO wasn't too clear to me, but now I "Get it" ... Thanks again... great videos!

just this year I heard about this raspberry pi, it has been hanging around for years already. I'm glad that there still free video like this to learn. Thank you.

Your enthusiasm is contagious, I wish I'd had an I.T. teacher like you at school!

You are simply the best at explaining. Thank you.

Have to do a bit of microcontroller engineering at work and this video is a relieving primer -- thank you for this crisp exposition.

Pure information - invaluable in today's world. Extremely clear, concise, excellent productions. Kudos.Thanks

it's a shame to say that, as a student who just started learning python, i did not understand well during my class. But watching your lesson helped me a lot ! Thank you so much!

Glad I decided to bingewatch your videos on SPC's, I was just about to mess with buttons and GPIO on my ESP8266 and I had never heard of pull up and pull down resistors. Great explanation for electrobics noobs!

I like how you show a variety of circuit diagrams to help understand

Another great video! I recently completed a school A-level project using a raspberry pi, and your videos were, and still are a valuable resource to me when making that project! Your videos are so easy to understand, and basically taught me the more useful stuff a pi can do, so, thanks a bunch for the great videos!

Thanks for this excellent tutorial. While I'm a competent programmer, any discrete electronics knowledge I had fell out of my head 10+ years ago - this was perfect to give me everything I need to actually get back into it.

thank you for such a simple and comprehensive tutorial, which helps new comers understand basics that aren't found easily

Oh wow.. This is so awesome! Please continue this type of explaining of builds. Without anyone next to me in normal class to ask questions of. This is by far the next best thing. I wish I could hit a subscribe on you tube to send money for your great efforts. You have not set with in UKposts.

This is a great video thank you! I think I was just as stoked about the open and close when it scrolled on screen as you were! Computers rule!

Another great Raspberry Pi video. It's interesting to see the sorts of projects you could make with the GPIO pins.

Thank you - this is exactly the kind of Pi video I needed to see. I'll be jolly glad to see anything more on the Pi. You set the standard that others can only follow. I wish you a great week.

amazing job. Only video I've seen that actually explains the how and why bits in simple terms. Very high quality content; exactly what I needed to understand GPIO. Great teacher, and great skills. Subscribed.

Thanks for this. I've been a an electronics hobbyist for months. This is the first clear explanation of why and how a pull up/down resistor is used. Tons of videos where they say they're using them. So few explanations as to why or how they worked (what they do and why to use them), I was starting to wonder if they were different kinds of resistors. Very clear video. Thanks again.

Fantastic video! I too have never been really able to understand what and how the pull up and pull down do and work. I appreciate your tip on the safety current limiting resistor going into the GPIO pin. I like your coding work as well. You have eloquently explained this... Thanks again for your excellent video! More Raspberry pi project videos like this one please.

Thank you! I've already done a kit from Adeept but did not know about Idle, I've been using Vim or sudo and haven't been thrilled as I prefer some for of gui for highlighting certain things.

I just received my Rasberry Pi 3 Model B the other day there so look forward to watching your tutorials on YT. Thanks!

You are one of the most helpful teachers in youtube! Thanks!

Christopher Barnatt is a Good UKpostsr... Explains in detail...

Thanks for another awesome video, I generally like your videos, andI love your videos on GPIO. Keep up the good work.

This is the best raspberry site I have ever seen! Please keep it up! very well explained and in the appropriate English language! Thank you

Great video! that's what I call a great class where efficiency and ease of learning meet. In a few minutes you really explained everthing I needed to know without wasting time. Thanks!!!

Excellent tutorial

That explanation about circuits was amazing.

Breadboarding, hardware and logic, good stuff. Thanks

Nice job. The explanation and graphic are very easy to understand.

Thank you very much! Very clear explanation on great ideas to have a computer respond to real world events.

Love the way you explain everything.. I hope you plan on doing more Tutorial, examples..

Great video! Very informative! Keep up the good work!

Great video, well explained with a good coverage of the electronics and why to add resistors as well as what the phython code does, Excellent.

This is the best tutorial for IoT I met.

Outstanding tutorial Thank You

Thank you very much, I learned a lot from this video.

amazing. really love how you share your experience :). I'm happy to learn from you.

Thank you! Very simple, but also very helpful.

Excellent Explanation! Well done.

I really enjoy watching your videos. Very detailed and easy to understand. I really would like if you can make a video of how to connect a Pi to an Arduino through the serial port and talk to each other. I have been watching a bunch of them but none of them are very clear to understand. Thanks

This breadboard must be at least 1000 years old :D Thanks for the video.

Thank you Christopher. You explain well.

Hats off to you man for precisely describing everything. Works for one of my problem quite easily. (y)

Wow, how is nobody commenting on the sheer size of this man's read switch!?

Thank you so much for this beautiful explain

Good Video, nice combination of circuit theory, actual wiring and enough software to get it going.

Positively brilliant tutorial and instruction. Your educational skills are masterful. Thank you for sharing your knowledge, and skills. Technical mastery and compassion incarnate. Thank you, Mister Barnett!

great video, thank you for taking the time to make it

Awesome. Loved this little tutorial

You are great thanks for all the great work you do, I had to recommend this site you developed to family.

I don't know if that's clay dough or play dough, but it's ingenious. I have stuff sliding all over my laminated desktop, and sometimes falling off the edge and going overboard. Sometimes I use rubber feet help to keep things from moving around while I work. So now I need to find out what that stuff is, find some that's non-conducting, and "dough down" all the electronics I have sliding all over my desk. And getting that Raspberry Pi 4B to work was a virtual nightmare. Neither of the two monitors I bought for this project would work with the MicroHDMI-to-VGA converters I bought. So when I first booted it up, I saw bits and pieces of boot-up stuff, but after boot seq., I got two blank screens. That was with Ubuntu Desktop, after I burned-off 5GB of bandwidth (I only get 30GB per month). I figured the download might be rotten, so I burned-off another 3GB of data using the Raspberry Pi Imager - which I no longer like. The problem with the Raspi Pi Imager is that you can't really store the download - it just downloads it and burns the MicroHD card. If anything goes wrong, you lose your download and whatever bandwidth you spent on it. You can copy the card, but you need a clean one for that, and I have Windows data on all of my spares. I also still have the 128GB SD Card from the Raspberry Pi 3B+ I still have, but for all that trouble, I'm not going to blow out that (working) OS. In the end, I tried another monitor and it worked. And then I found a second monitor off of another computer that worked. The two I bought for this project still work on other computers (with VGA output), but not on this machine. So that's really odd. I don't use Python - I use C or C++, so this is a nice video but I think I going to have to download some pre-made software that gives me access to the GPIO ports. I'm especially interested in the SPI ports, as you know, but there may or may not be software already written for this computer. SPI communications are not only data, but timing signals (clocks) that have to be synchronized with the data. I'm not sure how the computer does this, since it's usually done in the hardware. I can only hope that the BCM2711 has it built-in (for all six ports).

講解的非常好 也很用心 !!

Thank you for the video. I have learnt a lot and will be trying this out. I am still enjoying your videos and hope to carry on enjoying them.

Excellent demonstration!

You know that you don't need sudo anymore to control the GPIO ports right? Excellent tutorial, I wish you did this when I started 2+ years ago :)

I enjoy your videos. What is the "blue stuff" you use to hold the switch and breadboard in place?

this video is very help full for engineer or student ,thanks

Best tutorial I've seen! You explain things in a very methodical and clear way at a good pace. I am not new to electronics, just to the Raspberry Pi. I have started with Raspien and am using Thonny IDE. I see you prefer a different coding window, is it simply a command line? Do you prefer it to the Thonny? Thanks for making such outstanding tutorials.

Your videos are excellent, subscribed

you're becoming a hero now....

Nice pack of information! thanks.

exacty what I'm looking for. Thank's

Thank you very much, this video helped me greatly, I’ve subscribed and I am excited to watch more of your videos

Thanks for great explanation.

Love these videos. Thanks!

Great tutorial!!! Thank you sooooo much!

Chris, I love your videos and am working my way through all of them. May I suggest that the schematic drawing of the breadboard connections is confusing. I think you should explain how the "squares" are connected for those who are not familiar with breadboards. I.e., each vertical columns of squares on the extreme left and right are electrically connected together, while each horizontal rows of squares (excluding the extreme left and right squares) are connected together.

this is great!!! thanks

Thanks a lot for your great explanations and for your work

Great presentation style, well explained and easy to,follow

Thanks for posting this amazing video !!! I need to use GPIO 10, BCM15 (RXD). Do you know if there is any post about it ?

Liked the way you explained .... made things easy to understand . Thanks for the vedio

Are you by any chance doing a give away on any of these SBCs? I would love to submerge one in Mineral Oil and do load tests. I would also like to see if the GPIO works submerged as well

Excellent!!!!! thank you!!!!

Very useful info! I'm going to use it to make a sleep tracker.

Love these videos... Excelent explanation.

Interesting, thanks for this nice video!

Great video, looking forward for more! :)

Thanks for this!

This is a good video is easy to understand GPIO works for newbie like me ..

Hi mister Barnett. Thank you for your great explanation. I'd like to ask you a video to learn how to work with with analogic inputs and web page. My idea is to use Pi to monitoring electrical energy and correct the power factor. Then showing how the energy is going on an web page. Is this possible?

Wondering if you can have 'on conditions' or event handlers like you can in environments like, say, Javascript/Web. That might be more convenient than having to write polling loops all the time.

Thanks for your sharing. Would you tell me How to record the Digital Caliper reading into my Raspberry Pi ?

the pure torture of it all Chris is that I have to wait until the first to get my check... dang and I thought I learned patients as a lad... well I guess it is learn and learn again eh? this is all too exciting..

The 1k resistor to the board-pin makes sense almost no matter what. What would happen with the print statements (I mean the final output) if you had omitted the 10k resistor to the ground? Would it still work in some cases but not in others? What would I need to check / know to ascertain whether I need to put a resistor ?

Thanks for the great info on Raspberry Pi projects. Do you have anything on temperature sensors? I would like to remotely monitor a building's room temperature from a long distance through the internet. Thanks, I subscribed!

Thanks for this.

Magnifico.thanks

Thank you for making this! I have a recommendation. Please consider spreading out your components on the breadboard so that the fixed camera view and less intuitive viewers (me) can clearly see the inline resistor a couple of cm away before it splits into grounding-resistor and switched-3.3V

Your best video.