There were a couple different sensors you could use: one was rated for something like 4″ to 8′ with a 15 degree cone, and the other was 12″ to 12′ with a 12 degree cone.

The organ is played by standing in front of the Parallax Ping range sensor, and moving around any which way you please. He interfaced the range sensor with an Arduino, scavenging a small speaker ...

Ben Heck's been busy -- again. In the latest episode of his bi-weekly show he puts his considerable brain power to work on cycle safety. He uses Parallax ping sensors connected to an Arduino to ...