Introduction
This sensor 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.sensor measures distance using sonar; an ultrasonic (well above human hearing) pulse is transmitted from the unit and distance-to-target is determined by measuring the time required for the echo return.

The URM37 V3.2 Ultrasonic Sensor uses an industrial level AVR processor as the main processing unit. It comes with a temperature sensor which is unique in its class. The sensor has unique three output mode (PWM, RS232 or TTL) which let it easy to adapt to most devices and applications. The sensor provides one channel servo control output which can be used for sweep function.

The URM V3.2 Rev2 has a jumper which allows user to select RS232 level output or TTL level output.

Specification

Power: +5V
Current: <20mA
Working temperature: -10 ~ +70 C
Detecting range: 4cm-3m (3-5m is possible, but depending on situations)
Resolution: 1cm
Interface: PWM, RS232 or TTL (via Jumper)
Servo control: One servo control output
Operating Mode: Serial (PWM) passive control mode; Autonomous Mode; On/OFF Mode
Temperature sensor: 12 bits reading from serial port
Size: 22mm × 51 mm
Weight: 30g

Tutorial
Arduino Library Tutorial

Projects
http://letsmakerobots.com/node/5629