RESO! ultrasonic Distance sensor module is perfect for any number of applications that require you to perform measurements between moving or stationary objects. Naturally, robotics applications are very popular but you'll also find this product to be useful in security systems or as an infrared replacement if so desired. What supersedes RESO! ? its high sensitivity, narrow fade zone and quick response time. Use it for object detection, distance measurement, height mesurement, liquid level indication, security control, counting, etc

Features:

    Provides precise, non-contact distance measurements : Range 2 cm to 3 meter
    Simple pulse in/pulse out communication
    Narrow acceptance angle
    3-pin header makes it easy to connect using a servo extension cable, no soldering required
    Power requirements: +5 VDC
    Communication: Positive TTL pulse
    Compatible with any microcontrollers like Arduino, Basic Stamp, Propeller, 8051, AVR / Atmega, PIC
    Frequency : 40 Khz
    continual response time : 5 ms