With a standard old HC-SR04 ultrasonic sensor, an audio module ... As simple as this project may sound like for anyone who has a bunch of these little Arduino-compatible modules lying around ...

But if you’re just starting out, here’s a quick list of the most useful components for your Arduino ... sensor. Likewise, ...

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 ...