This project simulates a smart alert system using an HC-SR04 ultrasonic sensor, LED, and buzzer. Built and tested in the Wokwi simulator, it demonstrates how proximity detection can trigger safety ...

[Klaus] wanted some sort of aid for parking his car, and after running across a $4 ultrasonic sensor, decided to build his own speaking distance sensor (.de, Google Translation). Inside [Klaus]’ ...

This is a simple arduino project for a soil moisture sensor that will light up a LED at a certain moisture level. It uses Arduino Duemilanove microcontroller board. Two wires placed in the soil pot ...