Posted in Arduino Hacks, Wireless Hacks Tagged arduino, HC-SR04, lm386, lm393, ultrasonic ← Tracking CubeSats For $25 Linux Fu: Counter Rotate Keys! → ...

For many kids, the tin-can telephone is a fun science experiment that doesn’t last much longer than it takes to tangle the string around a nearby tree. [Geoff] decided to go a different howev… ...