With a standard old HC-SR04 ultrasonic sensor ... re too close for comfort. As simple as this project may sound like for anyone who has a bunch of these little Arduino-compatible modules lying ...

While early scientists and inventors famously underestimated the value of radar, through the lens of history we can see how useful it became. Even though radar uses electromagnetic waves to detect ...

However, the Arduino remains the recommended platform when it comes to hardware-focused projects ... with frequently used ...