Arduino & IoT Academy · Lesson

Build a Proximity Alarm

Buzz when something gets too close.

Turn Range Into Action

You can read distance, so now react to it. A proximity alarm buzzes the moment something comes too close to the sensor. 🚨

Wire a small buzzer to a digital pin and to ground. Driving that pin HIGH makes a sound, and LOW makes it stop.

const int buzzerPin = 8;