How to Control a Servo with an Ultrasonic Sensor and Arduino

Bring your Arduino projects to life with a servo that reacts to how close someone (or something!) gets. Picture a prop swiveling to meet your gaze or an interactive display responding like it’s “aware” of your presence. Reactive designs like these might seem high-tech, but they’re surprisingly easy to create with the right components and a bit of Arduino code—and that’s exactly what I’ll guide you through today.

In this Arduino tutorial, you’ll learn how to control servos with an ultrasonic sensor and Arduino. We’ll start by wiring up the components and diving into code that takes distance readings from the ultrasonic sensor to drive the servo’s movement.

First, I’ll show you how to make the servo snap to 90 degrees when something gets close. Then, we’ll take it further by mapping proximity to smooth, gradual servo movement from 0 to 180 degrees.

So grab your Arduino, and let’s add some “wow” factor to your next interactive prop or Arduino project—because who doesn’t want a little more personality in their builds?