---
title: "AddOhms #15: Pull-Up Resistors (and buttons)"
description: "Pull-Up Resistors, can be a difficult topic for to understand. That's why I made this video."
canonical: "https://www.baldengineer.com/addohms-15-pull-up-resistors-and-buttons.html"
author: "James Lewis"
date: "2015-08-10T13:00:05Z"
lastmod: "2022-03-31T01:10:10Z"
image: "https://www.baldengineer.com/wp-content/uploads/2015/08/AO15-Single-Frame-500px.png"
categories: ["addohms","arduino","electronics-basics","msp430","videos"]
tags: []
---

# AddOhms #15: Pull-Up Resistors (and buttons)


The latest AddOhms looks at why you need a pull-up resistor when using push-buttons. This video goes into what happens when you leave a pin floating, what a floating pin means, and how the pull-up works. You can get more information about the video on the [AddOhms Episode page](http://www.addohms.com/ep15).

> Pull-Up Resistors can be a difficult topic to understand. That's why I made this video.

This tutorial is the 2nd time I've made a [video on pull-ups](/video-tutorial-buttons-and-pull-ups.html). Despite being a single resistor, it can be a difficult topic for new hardware designers to understand. The pull-up video was the first video tutorial I ever made. In fact, the YouTube version uses YouTube's "stabilization" algorithm, which gives the video a very warped feel.

[AddOhms #15](http://www.addohms.com/ep15) shows improvements in skill over the past couple of years!

> **Note:** What's another topic that I need to cover in an AddOhms Tutorial?