This video shows how I built an ultrasonic tape measure using an Arduino Duemilanove, a PING))) sensor, and a 7-Segment Shield. As someone guessed in the comments, I developed this distance sensor as a component in my Arduino Nerf sentry gun project.

As soon as I get a chance to clean up the code, I’ll post my Arduino sketch here on Make: Online.

In the Maker Shed:

PING))) sensor

7-Segment Shield