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Lightware SF02 Product Manual

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SF02
Laser rangefinder
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The SF02 is a lightweight laser
rangefinder module that provides fast
and accurate distance measurements.


The module comprises all the
necessary optical and electronic
components along with embedded
software for a pulsed laser, time-of-
flight, distance measuring
instrument.
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Its configurable features and
standard hardware interfaces make
the SF02 an easy to understand
module that can be used in
unmanned aerial vehicles (UAV),
radio-controlled aircraft and robots.
SF02 Laser Rangefinder - Product Manual - Revision 4
Product manual
Features:
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A laser-based rangefinder module suitable for
many applications.!
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Accurately measures the distance to natural
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surfaces and objects.!
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Can detect surfaces and objects up to a distance
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of 40 meters.!
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Measures distance at 12 readings per second.!
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Includes digital and analog interfaces with
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programmable capabilities.!
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Easy to configure using the built-in menus and
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LightWare's Terminal software.!
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Fully calibrated and ready to run.!
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Affordable for the student or hobbyist.!
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Robust and reliable.!
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Not affected by: wind; changes in barometric
pressure; noise; ambient light; terrain or air
temperature.
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! of !
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© LightWare Optoelectronics (Pty) Ltd, 2013

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Summary of Contents for Lightware SF02

  • Page 1 Affordable for the student or hobbyist.! • Robust and reliable.! • Not affected by: wind; changes in barometric pressure; noise; ambient light; terrain or air temperature. ! of ! SF02 Laser Rangefinder - Product Manual - Revision 4 © LightWare Optoelectronics (Pty) Ltd, 2013...

  • Page 2: Table Of Contents

    Information found in this document is used entirely at the reader’s own risk and whilst every effort has been made to ensure its validity neither LightWare Optoelectronics (Pty) Ltd nor its representatives make any warranties with respect the accuracy of the information contained herein.

  • Page 3: Overview

    SF02 can be configured using a simple software menu that is accessible through the built-in USB port. The SF02 works by measuring the time it takes for a very short flash of laser light to travel to an object and back again. The accuracy of the measurement is not affected by the the color of the object’s surface or the angle of incidence of the laser beam to the...

  • Page 4: Quick Start Guide

    -1.00m to +1.00m Adjusts the point from which measurements are taken calibration 7. Once you have confirmed your settings, click the “Disconnect” icon and disconnect the USB cable from the SF02. 8. There are several power supply and interface options available on the green connector. These connections are used to integrate the SF02 into your system and details of all the options are explained later in this document.

  • Page 5: Making Connections To The Sf02

    Power supply option 1: USB The first option is to power the unit directly from the USB port of a PC or laptop. This is particularly useful for testing the SF02 before it is installed in your system and also for changing the settings in readiness for the final application.

  • Page 6: Figure 4 :: Regulated 5V Dc Supply

    1 is not used. The 5 V DC supply would typically be taken from an existing power rail that is used to supply other electronic equipment. CAUTION: The +5 V power input on screw terminal 3 is not protected from reverse polarity. Damage to the SF02 will result if this connection is reversed.

  • Page 7: Figure 6 :: Usb Communications

    USB interface The SF02 has a mini USB interface that can be used to communicate with LightWare Terminal software on a PC. This connection also provides power to the unit thereby presenting a quick way to test and configure the SF02. The associated serial port transmits at 115200 baud with 1 stop bit and no parity or handshaking.

  • Page 8: Figure 9 :: Serial Interface, Auxiliary Serial Port Basic Connection

    The time when distance data is transmitted from the auxiliary serial port is controlled by one of two triggers. The first is a software trigger provided by the host controller through its serial port and consists of the ASCII code for the letter <D>. When the SF02 receives this character it outputs the next available distance result which will happen in less than 100 ms.

  • Page 9: Menu Options

    Laser rangefinder Product manual 3. Menu options The SF02 can be connected through the on-board USB port to a Terminal emulation program running on a PC. LightWare provides a free Terminal program available for download from its website at http://www.lightware.co.za/index.php/lib-docs Once the USB connection is made, the Terminal window displays the distance reading from the SF02.

  • Page 10: Figure 12 :: Height Above Ground Represented By The Analog Voltage Output

    = alarm distance + hysteresis The hysteresis can be adjusted up to 1.00 meters. Figure 13 :: Ground proximity alarm warning of ! SF02 Laser Rangefinder - Product Manual - Revision 4 © LightWare Optoelectronics (Pty) Ltd, 2013...

  • Page 11: Figure 14 :: Measuring Speed

    Auxiliary serial port (UART) The auxiliary serial port, or UART, transmits a serial string of ASCII encoded data from the SF02 to the host controller. The baud rate of transmission is selected by menu item <5> and can be any of the standard baud rates from 4800 to 115200. By default, there is one stop bit and no parity or handshaking on this serial port.

  • Page 12: Instructions For Safe Use

    Make sure that the SF02 is switched OFF before looking into the lenses. The SF02 should be mounted using the four holes provided in the circuit board. Do not hold or clamp the lens tubes as this may cause damage and adversely affect the laser safety rating.

  • Page 13: Appendix A :: Specifications

    4 x 3.2 mm holes spaced 32 mm x 52 mm Operating temperature 0 ... 40°C Approvals FDA accession number: 1310953-000 (2013/12) Figure 17 :: Accuracy profile of ! SF02 Laser Rangefinder - Product Manual - Revision 4 © LightWare Optoelectronics (Pty) Ltd, 2013...

  • Page 14: Appendix B :: Dimensions

    Move section “1. Overview” to page 3. Include “-“ and “+” symbols in Figures 3, 4 and 5. Update UAV image in Figures 12, 13 and 15. Rev 0 2013/09/03 First edition of ! SF02 Laser Rangefinder - Product Manual - Revision 4 © LightWare Optoelectronics (Pty) Ltd, 2013...

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