Pull-up and pull-down resistors

Рет қаралды 49,756

Julian Edgar

Күн бұрын

Pull-up and pull-down resistors - what are they and why are they needed? My book - www.amazon.com/dp/1787112810

Пікірлер: 86

@moceasar671 4 жыл бұрын

Better than all the explanations out there on pull up resistors. Simple, no fancy words, straight to the point. Ty

@JulianEdgar 4 жыл бұрын

Thank you.

@PhilipBryden 11 ай бұрын

Easily the best and simplest explanation of pull up / down resistors I've came across. Thank you.

@JulianEdgar 11 ай бұрын

You are welcome!

@user-su5zw2tm9r 11 ай бұрын

Awesome! Spent an hour trying to get my head around this before I found this video, then I had it in 3 minutes. Good on you mate!

@JulianEdgar 11 ай бұрын

Great to hear!

@NikonCrayzee 5 жыл бұрын

Very clear and simple explanation - thank you

@thedanielcer 2 жыл бұрын

This is hand down the best video explanation of this

@jet6091 4 күн бұрын

Thanks so much! Was struggling with my uni's diagrams. This made it very clear! And you seem like a really nice guy.

@JulianEdgar 4 күн бұрын

Glad I could help!

@stevekyhon Жыл бұрын

This is the best explanation so far. Thanks so much! Now, I understand how they work.

@JulianEdgar Жыл бұрын

Great to hear!

@MrDangerousBOB 10 ай бұрын

perfect explanation, it will allow me to read my hardware schematic better at my work. I am an embedded systems engineer.

@Lexyvil Жыл бұрын

I'm learning this in my embedded systems class, and you cleared the idea up easily! Thanks!

@JulianEdgar Жыл бұрын

Glad it was helpful!

@abdulaziza Минут бұрын

Thank you

@abdul-kabiralegbe5660 2 ай бұрын

This really explains the reason behind the names. Thanks!

@paulla7429 3 жыл бұрын

Understood this better than the explanations in my Native language

@kpfalconi 2 жыл бұрын

Thank you sir for making this video clear and concise. Cheers!

@JulianEdgar 2 жыл бұрын

You are welcome!

@fusco80 4 жыл бұрын

Great video, I see this type of application quite alot in BMS controls. Thanks for explaining it so well.

@JulianEdgar 4 жыл бұрын

Thank you!

@BuiltByBlake 2 жыл бұрын

so helpful. And clear! Thanks mate

@k.chriscaldwell4141 2 жыл бұрын

Superb. Thanks. Love the accent, too.

@guliyevshahriyar Жыл бұрын

Thank you very much, that's a great introduction!!!

@kurthansen391 6 ай бұрын

Thank you so much

@elijahsmith7552 Жыл бұрын

Great video. Thanks!

@TsetTsyung 10 ай бұрын

Just learning basics of Arduinos, and pullup/pulldown has stumped me for 2 days. Thanks for the explanation in such a concise video!!!

@JulianEdgar 9 ай бұрын

Great to hear!

@josecatalan4787 6 ай бұрын

awesome video!

@VishalThakur-ek7nd 4 жыл бұрын

You must be a great teacher... Love from India

@JulianEdgar 4 жыл бұрын

Thank you!

@captaincurd2681 2 жыл бұрын

Yes he is. I feel like he could teach me math even when I am in a coma.

@giantbee9763 Жыл бұрын

Great explanation. Thanks!

@775969772 Жыл бұрын

Thx for the video.

@ahmadabdel9114 Жыл бұрын

thank you, easy and quick

@ec11368 2 жыл бұрын

Thank you very much

@7minnow 2 жыл бұрын

Nice explanation Great job just subscribed

@selvalooks 4 жыл бұрын

clearly explained !!!

@SuvankitSahooBCS Жыл бұрын

Beautiful explanation !!

@JulianEdgar Жыл бұрын

Thank you.

@johanneschristianlenk9950 Жыл бұрын

Danke dir Julian, hat echt geholfen :)

@vinaykumargupta7487 3 жыл бұрын

thank you sir ...a great explanation

@JulianEdgar 3 жыл бұрын

Thanks and welcome

@amjadiqbal478 9 ай бұрын

Great, wonderful explanation 🎖️

@JulianEdgar 9 ай бұрын

Thanks! 😃

@blueonblueracingnova 2 жыл бұрын

Best explanation I have seen thank you

@JulianEdgar 2 жыл бұрын

You are welcome

@aialra588 2 жыл бұрын

fantastic explanation！

@JulianEdgar 2 жыл бұрын

Thanks! 😃

@tk007b9 10 ай бұрын

Lots of confusion, watched your explanation for 2 mins and understand it perfectly! - thank you - Pullup and Pulldown resistors are ordinary resistors and not 'special types of resistors'. - If a resistor is connected to ground (it's a pull down) or if the same resistor is connected to a +ve voltage (e.g. 5v dc) then it will be a pull up resistor. Bingo! but WATCH the Video!!! :-)

@JulianEdgar 10 ай бұрын

Glad it helped!

@markostanisavljevic4072 Жыл бұрын

Nice and easy explanation 👌

@JulianEdgar Жыл бұрын

Thank you 😊

@andrawsfarah8320 3 жыл бұрын

thank u sir

@JulianEdgar 3 жыл бұрын

Welcome

@dansylvester3579 2 жыл бұрын

Question internal pull-up resistor is bad in BCM. You think I could add external pull-up resistor? I was able to trick BCM with a 3.7 volt battery.

@mikeadler434 4 ай бұрын

👍👍

@magnusbrzenk447 2 жыл бұрын

In the case of the pull-up resistor, surely whether the input is "true" depends on the value of the resistor, no? It seems that if you make the resistor's resistance sufficiently large, the voltage drop across the resistor will reduce the voltage available to the input below its logical-truth value.

@JulianEdgar 2 жыл бұрын

Not with such a high input impedance.

@alexanderstroborg1805 2 жыл бұрын

Textbook explanation Julian!

@JulianEdgar 2 жыл бұрын

Thank you!

@serdarcal Жыл бұрын

Peki pull-down direnci bir şekilde zarar görürse ve biz arduino ile bir step motor kontrol ediyor olsak bir direnç yüzünden butona basmadığım halde buton tetiklenip step motoru hareket ettirince kullanıcıya zarar vermezmi?

@Flipmole123 6 ай бұрын

Why can't you connect the input pin directly to VCC without a pullup resistor? I know you shouldn't short the power supply to ground when pressing the switch, but is this the only reason? Would supplying 5V to the input pin work the same as using a pullup resistor?

@amirarab254 2 ай бұрын

Thank you very much for your clear explanation. Nevertheless I have a question: at minute 1:40, why can’t the current flow also to the ECU, when the switch is closed?

@JulianEdgar 2 ай бұрын

Because the resistance to ground is much lower than the resistance to 5V.

@amirarab254 2 ай бұрын

Do you mean, the resistance to the ground is much lower than to the 5V or to the ECU?

@sumanthcheedepudi8751 2 жыл бұрын

Great video. Let's say I am trying to connect one end of the switch to gnd. So, I have to do a pull up inside the controller. Can I do a pull down instead of pull up for the same ? Thankyou

@JulianEdgar 2 жыл бұрын

@sumanthcheedepudi8751 2 жыл бұрын

@@JulianEdgar The use of pull up or pull down is to take away the floating condition of the pin so that it won't pickup noise. So what I am thinking is instead of driving the pin to Vcc, I will drive it ground. So even if I close the switch, whose other end is also at 0 , the pin will still drive to 0. So isn't it a user's choice to pull up or down ? Am I missing something ?

@JulianEdgar 2 жыл бұрын

@@sumanthcheedepudi8751 Can your specify a pull-up in the controller? If you can, you can use the switch to pull to ground. If the controller uses a pull-down, and you can't change that to a pull-up, the switch to ground won't do anything.

@chriswaggoner2388 Жыл бұрын

I can't find your book on Abebooks.

@JulianEdgar Жыл бұрын

Amazon

@user-kh6rp6yx1j 9 күн бұрын

Hello.

@rul1175 Жыл бұрын

Is there an equation to know how much the resistor needs to be?

@JulianEdgar Жыл бұрын

A good question - and I don't know the answer. Typically I don't think it matters much eg 1-10K.

@xoralundra536 4 жыл бұрын

Can someone explain why when he uses the pull down resistor and the three-state is in conduction the circuit doesn't burn? Sorry for bad english

@JulianEdgar 4 жыл бұрын

Because the resistor limits current flow to a tiny amount.

@xoralundra536 4 жыл бұрын

@@JulianEdgar thank you appreciated, you're the man

@mumbucorporation7243 4 жыл бұрын

I don't get it also: in pull-down scheme and closed button state there is no resistor between 5V and the ecu (input pin, that will burn every pin as they can't handle high currents. So if I get it right, you need another resistor in between 5v and the ecu. Is that right?

@JulianEdgar 4 жыл бұрын

@@mumbucorporation7243 The ECU has a high input impedance. See kzfaq.info/get/bejne/Z5l6YMiWubLPZKs.html