Floating Pins, Pull-Up Resistors and Arduino

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This tutorial talks about floating pins. Specifically, what they are, why they are unwanted and how to deal with them.

[@programmingelectronics]

****If you like this, I think you'll like the premium Arduino training we offer. You can check it out here**** bit.ly/3lHyzcB

[@enteranamehere4541]

The one phrase that made this video different from all others, and better than all others, is "the path of least resistance." Hearing that gave me a eureka moment. Thank you so much.

[@mhelms1983]

Hands down the best explanation on a pull up resistor I've seen. I actually understand now, thank you for this. Subscribing.

[@programmingelectronics]

Glad you liked it, thanks for watching!

[@cobra646]

same. So many terrible "tutorials" so sift through until you find a good one on youtube

[@blehprojects5776]

Holy crud I’ve been looking at videos like this for over a month now and this is the first one that explains things in plain English! Keep ‘em coming!

[@programmingelectronics]

I hope it helped!

[@clunkclunk2099]

I’ve watched about four videos on this topic, and yours is the first that explicitly says why a resistor is needed not just how to do it. The part where you said path of least resistance is when the proverbial lightbulb went off in my head. Thanks!

[@programmingelectronics]

Great to hear! Sometimes for me I think it takes quite a few different angles, and then all the sudden things pop into place - its a great feeling. Glad this could help some!

[@independent900]

@@programmingelectronics I don't think it's about repetition and different angles, it's more about asking and answering the right questions, and breaking it down into digestable parts. After previous videos I was still clueless at the end. Your explanation and visual aids were fantastic, and I echo @clunkclunk2099's experience. Thank you!

[@elecnut8211]

I dont think you have any idea how much you are helping the electronics community. Thank you thank you thank you !!

[@tedthisius4778]

Great video. I always think of a pull up resistor like a coil spring. When the resistor is connected to 5V, it tries to pull up the voltage at that point to 5V but can be overcome by a direct connection to ground when the button is pushed. Much like a spring, it returns to the original position (5V) when released. When the button is pushed there is a 5V drop across the resister which is converted to a very small amount of heat. There is very little current flow because the resistance is relatively high. A pull down resistor really works the same way, the resistor or "spring" is connected to ground. When the button is pushed the switch can provide 5V which overcomes the ground and produces 5V to the Arduino pin. Since the symbol for a resistor is a wiggly line, it reminds me of a coil spring.

[@jamescashmore8408]

best explanation i have ever found. You have a skill that many people lack that is explaining things clearly and using the right images to add to what you are saying. So many videos the stuff on the screen doesn't quite fit what is being said.

[@EgyGyro]

another great expression; " *Tying up* the pin to a certain voltage". It draws a clearer figure in my mind than "pulling up" the pin to voltage.

[@jupiter457]

I finally understand this concept now!!! Thank you. Your tutorials are great.

[@afraimuangnory7195]

you are really a gift to engineering.I now understand clearly what is mean by pull up resistor. I am try to get the money so that i will buy training materials from you . thanks a lot .

[@MinhNg180]

This video just cured my headache. Thanks a lot.

[@programmingelectronics]

Glad it helped!

[@humanperson8418]

Best explanation of Pull-Up Resistors I've seen. Only improvement is if you said the Arduino has one built in, and how to activate it.

[@programmingelectronics]

Thanks so much for watching! Good call - that totally should have been covered in this video. You may already know, but just in case... To use the internal input pull up, use pinMode(yourDigitalPinNumber, INPUT_PULLUP) What this does is set the pin as an input - so it can read digital inputs - but it is internally being pulled to a HIGH state. If you want to trigger your input, you connect the pin to ground (i.e. through a button press) www.arduino.cc/reference/en/language/functions/digital-io/pinmode/

[@OneIdeaTooMany]

This is the best explanation I've seen and has also helped me understand what INPUT_PULLUP and INPUT_PULLDOWN are doing.

[@programmingelectronics]

Glad it helped!

[@freethinker1957]

Michael Cheich: Thank you for this excellent video. Took me a while to "get it", but now I do. After watching this, I took your free "Arduino Crash Course", which convinced me it would definitely be worth buying full access to all your training, which I have now signed up for (so you can, as you say, keep gas in your Lamborghini...) Now just a couple of notes (as Michael says, the best way to learn is to look for opportunities to "teach" - explain it to someone else): This video shows the problem of floating pins, and how to resolve that via an external pull-up resistor. Once you understand the concept, you can by-pass the problem on digital input pins in one of these two ways in your code (rather than on a breadboard) - using digital pin 2 as an example: pinMode(2,INPUT); digitalWrite(2,HIGH); // WRITING HIGH to this INPUT pin activates its built-in pull-up resistor. OR pinMode(2,INPUT_PULLUP); // Does both of the above steps in a single statement. Either of those activates the internal pull-up resistor built into the Arduino digital (and maybe analog?) pins. This info can be found in the Arduino Reference documentation for the pinMode function. Again, I suggest you DON'T use the built-in pull-up resistors until you complete this video and understand the problem of floating pins in the first place.

[@KW-ei3pi]

One of THE most important concepts for an Arduino use to understand. Thank you !!!

[@programmingelectronics]

Thanks so much for watching!

[@harshitrajput6865]

After learning from your tutorials from one week , no other tutorial on youtube can match your level ! Thanks man !

I got No words to express how iluminating your videos are.... you make all the electronic's messy theory a vivid and smooth experience. THANK YOU SO MUCH

[@lizardofoz5329]

After watching AddOhm's tutorial I understood this topic. Now I am confused again. Never mind, I still liked it because you wrote some actual code and explained what it did and why. I am new to all this and it seems like everyone doing tutorials just uses simple existing sketches so you never see anything original being written. So bottom line, thank you and I'll watch this until I get clear on it again.

[@chunheichau7947]

Very good explanation on how the pull up resistor works, I have been finding a good explanation for a long time until I find this.

[@garvitgoyal5236]

Thanks a lot. I am a begineer in electronics and this problem made me frustated many times, but after your explanation it will be very easy to solve this.

[@kim15742]

lmao! I didn't even know I had this problem and since I am a programmer, I did the solution software-wise by it counting the number of loops that it's low. If it is low for over 20 loops the button is pressed. Not very elegant, I know

[@TheDeIirium]

Instant subscription after the first minute - brilliant humor.

[@twitchy9948]

I would also add that this mysterious "noise" is that cable starts working as an antenna (like the one in your phone), if you pull out the cable, the pin read will go from random to 0.

[@prashanthirwani8047]

For me as a beginner Most easy and value providing video on yt great explaination keep going🔥🔥🔥

[@programmingelectronics]

Thanks so much!

[@JohnIsaacBradshaw]

Seeing the circuit you built helped a lot. Thanks!

[@derrickadusei7987]

It solved my digital pin input problem. Thanks

[@bradandsusan96]

**THANK YOU SIR** Best tutorial's; simple, well thought out, flows logically and to the point. Great stuff!

[@mathiastyseng9208]

easy new sub, first vid to properly explain it

[@programmingelectronics]

Glad to hear it helped!

[@SymphonyKol_androidLover]

Beautiful explanation, was just looking for this, Thanks a ton.

[@programmingelectronics]

Glad it was helpful!

[@shvideo1]

The best video on this important concept. Very nicely done. Thank you.

[@ahmedamer777]

the atmega 328 has built in pullup resistor you have to activate in the void setup using digital write to high. ;)

[@katrinagarcia8645]

Funny guy. Love the intro with the surfing micro-controller

[@Richie_]

Nice one Michael. That helped.

[@programmingelectronics]

Glad it helped Richie!

[@rabiuls]

Thank you for the nice video. Another way to use arduino parameter "INPUT_PULLUP" for input pin. Like, pinMode(2,INPUT_PULLUP);

[@nesileylmaz7611]

Udııd

[@mohammedzoheb5299]

Well explained..thank you so much!

[@avinashpankhade8644]

great job... got it crystal cleared!!!!!!!!!!

[@henik9]

Thanks man this vid really clarified some stuff for me.

[@bernhardbaumgartner2890]

Great explanation, thanks a lot man!

[@programmingelectronics]

Glad it helped!

[@redtipon9910]

Thank you sir, I'm not really good at reading from the net but this video explain perfect. I love it!! subscribing. more power to you sir.

[@programmingelectronics]

Awesome, thank you!

[@MJ-iy4fb]

Good Lesson!!

[@Maxr1998X]

Excellent video. Now I understand a LOT more. Thanks!

[@programmingelectronics]

+Maxr1998X Great, glad you found it useful!

[@umarmoiz8810]

+Programming Electronics Academy Can we use INPUT_PULLUP in our code ?as opposed to adding an external resistor or does it not work like that ?

[@chuckhole]

I think it would have been helpful to add that changing the input pin mode assignment from pinMode(Pin_Input, INPUT); to pinMode(Pin_Input, INPUT_PULLUP); accomplishes the same thing and eliminates the need for an external resistor.

[@programmingelectronics]

Totally agree Chuck! Thanks for pointing that out!

[@vincent6313]

very helpful for my final exam. thanks

[@programmingelectronics]

+pengci gao Thanks for watching!

[@donaldklopper]

Remember: that life boat is still floating! Better pull that up into the ... no, wait.

[@davidizquierdogomez]

that was a very cool video tutorial. Thanks for solving the pull-up meaning and floating pins....so cool ¡¡¡

[@MakerTutor101]

Thank you your tutorials are great

[@guts-pn3st]

Finally! Thank you soo much

[@programmingelectronics]

I hope it helped!

[@johndripper]

cool i like how you explain things :) this was very helpful you were the reason i got interested in arduino :) and other MCUs

[@regpollock9403]

Thank you for making it understandable.

[@koemdjiev]

Great explanation, nice and simple, thanks! I was having difficulty understanding the Pull-up pins

[@programmingelectronics]

Glad it helped! Thanks for watching!

[@vadimkoller6232]

Finally got it. Thank you

[@Lakitu1446]

Thank you i've finally understrood thanks to you !!

[@d4ny4pres1d3nt]

Thank you, you explain things very clearly! Cheers

[@programmingelectronics]

+d4ny4pres1d3nt Thanks for the kind words! I hope you enjoy the other videos.

[@pikeshmn]

Awesome Explanation!

[@AhmedDeedatPalestine]

The best video.

[@eugenevoltage1654]

Just watched multiple pull-up resistor videos. This is easily the clearest and best, thanks. One question please: Final circuit shown 9:00. Switch closed. I'm imagining that Pin2 is "positive" and current flows to GND. (Maybe I shouldn't be thinking like this, but either way I understand reading is LOW). Switch open. Current flows from 5Vpin to Pin2. Question - Pin2 must ultimately lead to ground for this to work right? Within the structure of the board.

[@jorgemariofernandezfuentes3399]

Excelente Información!!

[@jeroendruwe9061]

Very good explanation :)

[@FRADemons]

Very good video! So helpful !!

[@thomasalexander1563]

Nice tutorial agains... Love this channel

[@lgflanang]

Simply put, it is a bounce. And the pull up resistor corrected it to a point.

[@jeranrai645]

This is the best tutorial i ever encountered but still a small question. After the pull up resistor is connected to 5V , isnt the connection to digital pin 2 is always gonna read High even after its pressed or not ! or am i wrong on some logic ?

[@epartsacc]

Great explanation, as a follow up, why don't you do a video on the internal pull ups of the arduino?

[@noud8868]

Electronic Parts idd really like to see a video explaining int pullups as well.

[@favesongslist]

@@noud8868 Using the internal pullup means you don't need to add your own pullup resistor. To connect the pin including using the pullup resistor included in the Arduino use this code in the example given in the video pinMode(Pin_Input, INPUT_PULLUP);

[@haribukkeprasad4612]

Thanks a lot for the explanation. You really saved my day. :)

[@bryanwesterveld5287]

This explained it very well!

[@Ammani-Yat]

great lecture 👍

[@northshorepx]

Nice a simple and makes perfect sense now! Thank you.

[@programmingelectronics]

+northshorepx Thanks for watching - glad it helped!

[@alexp7274]

Great explanation.

[@programmingelectronics]

Thank you - I appreciate that!

[@MilanKarakas]

What you are reading at "floating" pin is your main (50 or 60 Hz). That is because input pin has very high impedance. Pull up resistor make "offset" to the +5V. But, you may want to avoid adding resistors to +5V by simply using next code(s): pinMode (2, INPUT_PULLUP);, where MCU gives about 200 kOhm resistor internaly to pin 2. Or: pinMode (2, INPUT); digitalWrite(2, HIGH);, which gives the same result. Note that although pin 2 is input, you write in setup HIGH value (digital 1). There is NO pull-down resistor inside MCU. Another advanced way to make whole sketch: void setup() { Serial.begin(9600); DDRD &= ~(1

[@pikeshmn]

Floating pin take charges around from your finger, stray wires etc.! This causes the fluctuating voltage..So you need to tie it up! Nice concept!

[@kameelamareen]

WOW man hands down for sure !!!

[@threeelancer]

Thanks, it helped.

[@programmingelectronics]

Glad it was useful!

[@shaunsomaru4524]

Thank you for great explanation

[@programmingelectronics]

Thanks Shaun!

[@joshuapitong899]

Thank you.❤

[@programmingelectronics]

Thanks for watching!!!

[@pi11sburydoeboy]

Great explanation. Subbed!

[@The1Creston]

Thank you. That helped a lot!

[@mayurthombare3288]

Thanks for this helpful video

[@Moncayoboy]

Good explanation, thanks.

[@programmingelectronics]

Raul M Thanks!

[@SukhdevSingh-tp4mg]

Good job!!!!!!!!

[@programmingelectronics]

Thank you!

[@bartnoe4194]

Thank you for your clear explanation. great course!

[@programmingelectronics]

Thanks Bart - I hope you can find them all helpful.

[@RixtronixLAB]

Nice video, thanks for sharing :)

[@programmingelectronics]

Thanks for watching!

[@filipemarques9144]

Finally...now I get it! Thanks! :)

[@WhiskyPankcake]

Great tutorial

[@programmingelectronics]

WhiskyPankcake Thanks!

[@defariase]

This tutorial is pretty awesome! Thanks for uploading it. I'm subscribing to your channel for more! Cheers, LD

[@kenfranco7981]

Great video but why don't you use the internal pull up resistor built into the Arduino boards instead of an external pull up resistor ?

[@programmingelectronics]

Ken Franco Great question Ken! Since the button sketch examples that come loaded with Arduino all use external pull ups I decide to follow suit. But I agree, the INPUT_PULLUP is the way to go.

[@Cdaprod]

Holy shit I needed this today and you nailed it 7 years ago. Thanks algo and google spy lmao

[@programmingelectronics]

Glad it helped!

[@georgekot6377]

Good work. Thanks

[@programmingelectronics]

+George Kot Thank you for watching!

[@karimjibaku5866]

i always see it like electrons like to take the easy path so when electorn seees a resistor avoids it when it is invetable in this case while we don't press the push botton electrons need to take the other path where there is resistor

[@programmingelectronics]

Nice way to think about it!

[@karimjibaku5866]

@@programmingelectronics thank you for your efforts

[@oteikwufrancis1108]

Woohoo!! Thanks man. You just helped me understand the concept of floating pins. I've been trying to get this and all the other sources I consulted didn't help much. Thanks 😊 Also I checked your other tutorials and I'll like to pay for your course. But I'm a bit wary course I've registered for some courses and they turned out to not be what I expected. So, is there like a trial version I can test with before payment?

[@programmingelectronics]

Here is a free course we offer: www.programmingelectronics.com/arduino-crash-course/ If you like this, I think you'll like the training program.

[@cill521]

Very clear. Thanks

[@programmingelectronics]

+cill521 thanks for watching!

[@InventionTherapy]

Was Arduino the best choice for this project?

[@313jacob]

I'm confused. My understanding is that INPUT mode states that the pin reads voltage. The voltage flows from source to the ground. What is the source in this case? The flow is from the ground to the pin? I always thought that INPUT pin will read +v not ground.

[@alsayedalsisi2709]

+313jacob T thought that too and I was going to ask that until I saw your question

[@dannuttle9005]

Your're right, it does read voltage. Ground is 0 volts. If you connect ground to an input pin, it reads that as LOW. (On an Arduino, that is anything below, I think, 1.2 volts.) If nothing is connected, then the input pin floats, and you get unpredictable readings. Think of it in terms of water. Suppose that a garden hose is connected your pool (the Arduino) and ground (a drain). Let's say that in this bizarre pool-world in your Arduino, there can be passing rain showers that can instantly fill up your pool, and there are also other internal drains that will eventually (but not instantly) drain this rain water off. But once the garden hose is attached, water in the pool drains instantly. If you don't have the garden hose attached, that stray water sloshing around will vary, so that at times, it looks like the pool is full enough to swim in (the pin registers HIGH), and at others, it's barely full enough to wade in (the pin registers LOW).

[@actionoise]

thanks bro you permitted actionoise sistem......

[@REACH253]

Is it possible to implement a pull up resistor, but substitute the pushbutton with a sensor or an optocoupler?

[@mps6934]

Funny intro ^.^ Great explanation, too.

[@craigminca7446]

great explanation, thanks

[@programmingelectronics]

Thanks for kind note!

[@twinstarsnz3626]

Thanks mate!

[@randywetzler5976]

That's a great explanation of a "pull up" resistor. I assume a "pull down" resistor does the opposite holding the pin value to 0V. I see other tutorials where the content provider will connect the resistor(s) to the ground side of a LED(s) circuit so it's a little confusing to me. Can someone explain the best practice for both type circuit? Maybe in a simple circuit it doesn't matter, I don't know. I am new to this Arduino stuff.

[@chrismuszelik]

Thank you for de-mistifying pullups

[@programmingelectronics]

Chris M You Bet - I hope it helped.

[@wick3de]

you are great men! and nice humor twitch on it

[@programmingelectronics]

Thanks for watching Pinda !