Pull-up Resistors

Introduction

Pull-up resistors are very common when using microcontrollers (MCUs) or any digital logic device. This tutorial will explain when and where to use pull-up resistors, then we will do a simple calculation to show why pull-ups are important.

Suggested Reading

Concepts that you should be familiar with before proceeding:

• What is a circuit?
• Resistors
• Voltage, Current, Resistance
• Digital Logic
• Input/Output