Landing : Athabascau University
  • Blogs
  • Article on Pull-Up Resistors

Article on Pull-Up Resistors

  • Public
By Darren Hurren September 23, 2019 - 10:08am Comments (1)

Hey everyone,

I found a great artice online about the importance of pull-up resistors that I thought I would share. This was useful for my project since I was using pushbuttons. I ended up using the internal 20kOhm pullups on the SparkFun RedBoard (because of limited BreadBoard space) by setting pinMode to INPUT_PULLUP

example:

pinMode(holdBtnPin, INPUT_PULLUP);

 

Here's the link to the article:

learningaboutelectronics.com/Articles/How-to-connect-a-pull-up-resistor.php

 

I hope helps anyone who didn't have a full understanding of Pull-Up resistors. 

Comments

  • Hi Darren,

    This is very informative as I wanted to increase my understanding of pull-up resistors. The SIK guide was brief in its discussion on this topic. I intially thought that the pin only contained 2 states but after going through the article, it appears to be 3 states: LOW, HIGH, and floating. The floating state was a surprise as I didn't realize that the pin can go randomly between LOW and HIGH. This tells me that if I'm using a pin with a pull-up resistor, then I should clearly define the pin state.

    Thanks for posting this link,

    Andrew 

    Andrew Slade September 30, 2019 - 8:32am

These comments are moderated. Your comment will not be visible unless accepted by the content owner.

Only simple HTML formatting is allowed and any hyperlinks will be stripped away. If you need to include a URL then please simply type it so that users can copy and paste it if needed.

(Required)

(Required)