Maxbotix sonar sensor and Tilt ball switch in the Adafruit store!
The MaxSonar EZ1 provides very short to long-range detection and ranging, in an incredibly small package. It can detect objects from 0-inches to 254-inches (6.45-meters) and provides sonar range information from 6-inches out to 254-inches with 1-inch resolution. (Objects from 0 inches to 6-inches range as 6-inches.) The interface output formats included are pulse width output (PWM), analog voltage output (Vcc/512 volts per inch), and serial digital output (9600 baud).
Tilt ball switch – The “poor man’s” accelerometer! Tilt sensors are switches that can detect basic motion/orientation. The metal tube has a little metal ball that rolls around in it, when its tilted upright, the ball rolls onto the contacts sticking out of end and shorts them together. There’s no datasheet but they’re fairly easy to use! In the store now!
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I recently used the EZ1 in an interactive exhibit for the 2009 Boston Cyberarts Festival, and can attest to how easy it is to work with. I used the serial TX output with a PSoC micro, and with a little filtering, got accurate and repeatable sensing of people in the 3 to 6 foot range. Here’s a short video about the project, though there’s not much in there about the EZ1 specifically.