Tag: hc-sr04

Project: Automatic Alcohol Dispenser

This is my own version of automatic (No touch / touchless) alcohol / sanitizer dispenser. This is especially useful during this COVID19 pandemic. In here, we will be using an ultrasonic sensor to detect the presence of hand near the dispenser. When the ultrasonic sensor detects an object less than the set distance, it will […]

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TUTORIAL: How to use HC-SR04 Ultrasonic Sensor with Arduino

This tutorial is about the commonly use HC-SR04 ultrasonic sensor. We will give some details about it, explain how it works, and at the last part we will create an Arduino sketch to test its functionality. HOW HC-SR04 WORKS The HC-SR04 ultrasonic sensor uses a sound frequency to determine distance of an object just like […]

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