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Ultrasonic distance sensors
Ultrasonic sensor module US-100 
The ultrasonic sensor module us-100 is a convenient way for measuring distances from objects. This module has a lot of applications such as parking sensors, obstacle and terrain monitoring systems, industrial distance measurements, etc. It has a stable performance and high accuracy ranging from 2cm to 450cm. The module sends an ultrasonic signal, eight pulses of 40kHz square wave from the transmitter; the echo is then picked up by the receiver and outputs a waveform with a time period proportional to the distance. The connected microcontroller accepts the signal and performs necessary processing.
The US-100 can have a dip-switch. if it has, with the switch in place the US-100 will give a serial output. Whitout it will give an analog output.
Specifications:
Input voltage: 5V DC
Quiescent current: less than 2mA
Level output: 5V high
Level output: at the end of 0V
Induction angle: not more than 15 degrees
Detection distance: 2cm-450cm
Precision: up to 1mm
Dimensions: 4.4cm x 2.6cm x 1.4cm
Weight: 43g
some examples can be found here: http://arduinoinfo.mywikis.net/wiki/UltraSonicDistance
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