Tag Archives: pull up

Arduino Tutorial 27: Understanding Pushbuttons and Pull Up and Pull Down Resistors

Being able to add push buttons to your projects adds important new capabilities to your prototypes. It is a clever way you can get input from a user. You could imagine using push buttons to turn something on or off, or they could be used to set motor speed or direction. In order to incorporate buttons into a project, you need to understand the concept of pull up and pull down resistors. In this tutorial we show you how to include buttons in a project, by demonstrating a simple on/off function on an LED.

If you want to follow along at home, an official Arduino Uno R3 is available HERE. In this new series of lessons, I will be using the sensor and other components found in this KIT

This is the code we used in this project to switch the LED on and off.