Fastest finger first indicators (FFFIs) bring precision to quiz games, measuring contestants’ reaction times with accuracy.

If you’re working with 3.3V or 5V circuits, it’s easy for you to throw on a power ... Universal LED Driver, or CULD, to do the job instead. The CULD is designed as a simple LED indicator ...

These devices have key drawbacks. Water level indicators require manual pump operation and often waste power as multiple LEDs ...

so they decided to wire up their own CPU indicator by sensing the state of the Turbo LED with an Arduino Pro Mini. Now to modern audiences, this might seem like cheating. After all, the Arduino ...