Operation Manual

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LIDAR-Lite v3HP Operation Manual

and Technical Specications

Laser Safety

 WARNING

This device requires no regular maintenance. In the event that the device

becomes damaged or is inoperable, repair or service must be handled by

authorized, factory-trained technicians only. Attempting to repair or service

the unit on your own can result in direct exposure to laser radiation and the

risk of permanent eye damage. For repair or service, contact your dealer or

Garmin

for more information. This device has a protective housing which,

when in place, prevents human access to laser radiation in excess of the

accessible emission limit (AEL) for Class 1 laser products. This device should

not be modied or operated without its housing or optics. Operating this device

without a housing and optics, or operating this device with a modied housing

or optics that expose the laser source, may result in direct exposure to laser

radiation and the risk of permanent eye damage. Removal or modication of

the diffuser in front of the laser optic may result in the risk of permanent eye

damage.

 CAUTION

This device emits laser radiation. Use of controls or adjustments or

performance of procedures other than those specied herein may result in

hazardous radiation exposure.

This laser product is designated Class 1 during all procedures of operation.

When the ranging feature of the device is activated, a laser emitter of a

ranging module may emit laser radiation and the device should not be aimed

toward anyone. Avoid looking toward the laser emitter or into the laser

radiation (beam) when operating the device. It is advisable to turn off the

ranging module when it is not in use. This device must be used only according

to the directions and procedures described in this documentation.

Do not leave this device within the reach of children.

NOTICE

CLASS 1 LASER PRODUCT

Classied EN/IEC 60825-1 2014

This product is in conformity with performance standards for laser products

under 21 CFR 1040, except with respect to those characteristics authorized by

Variance Number FDA-2016-V-2943 effective September 27, 2016.

Table of Contents

LIDAR-Lite v3HP Operation Manual

and Technical Specications �� 1

Laser Safety ......................................................................................................1

Specications �� 2

Physical .............................................................................................................2

Water Resistance ..............................................................................................2

Electrical ............................................................................................................2

Performance ......................................................................................................2

Interface .............................................................................................................2

Laser ..................................................................................................................2

Connections �� 2

Wiring Harness ..................................................................................................2

I2C Connection Diagrams .................................................................................2

Standard I2C Wiring ....................................................................................2

Standard Arduino I2C Wiring .......................................................................3

PWM Wiring ................................................................................................. 3

PWM Arduino Wiring....................................................................................3

Operational Information �� 4

Technology ........................................................................................................4

Theory of Operation ...........................................................................................4

Interface .............................................................................................................4

Initialization ..................................................................................................4

Power Enable Pin ........................................................................................4

I2C Interface ................................................................................................4

Mode Control Pin .........................................................................................4

Settings ........................................................................................................ 4

I2C Protocol Information �� 6

I2C Protocol Operation ......................................................................................7

Read Operation ...........................................................................................7

Write Operation ............................................................................................7

Control Register List ....................................................................................7

Detailed Control Register Denitions ........................................................... 8

Frequently Asked Questions �� 10

How do I use the device for fast-scanning applications? ................................. 10

Does the device operate only on 5 Vdc? ......................................................... 10

What is the spread of the laser beam? ............................................................ 10

How do distance, target size, aspect, and reectivity affect returned signal

strength? ..........................................................................................................10

How does the device work with reective surfaces? .......................................11

Diffuse Reective Surfaces ........................................................................11

Specular Surfaces .....................................................................................11

How does liquid affect the signal? ...................................................................11

Summary of content (12 pages)

PAGE 1
Table of Contents LIDAR-Lite v3HP Operation Manual and Technical Specifications �� 1 LIDAR-Lite v3HP Operation Manual and Technical Specifications Laser Safety  WARNING This device requires no regular maintenance. In the event that the device becomes damaged or is inoperable, repair or service must be handled by authorized, factory-trained technicians only.
PAGE 2
Specifications Physical Specification Size (LxWxH) Weight Operating temperature Wiring Harness Measurement 20 × 48 × 40 mm (0.8 × 1.9 × 1.6 in.) 22 g (0.78 oz.) -20 to 60°C (-4 to 140°F) Water Resistance Body of this device is rated IPX7, and can wthstand incidental exposure to water of up to 1 meter for up to 30 minutes. IMPORTANT: The bare wire portion of the wiring harness is not water resistant, and can act as a path for water to enter the device.
PAGE 3
Standard Arduino I2C Wiring PWM Arduino Wiring ➋ ➌ ➊ ➋ ➍ ➊ ➎ ➐ ➏ ➍ ➎ Item Description 680µF electrolytic capacitor ➊ ➋ ➌ ➍ ➎ ➏ ➐ ➌ Notes You must observe the correct polarity when installing the capacitor. Pull-up resistor connection In installations with long cable extensions (not required in all applications) or with multiple devices on the I2C bus, you must connect the pull-up resistors on the SDA and SCL wires to the logic rail on your microcontroller board.
PAGE 4
Operational Information Technology This device measures distance by calculating the time delay between the transmission of a Near-Infrared laser signal and its reception after reflecting off of a target. This translates into distance using the known speed of light. Theory of Operation To take a measurement, this device first performs a receiver adjustment routine, correcting for changing ambient light levels and allowing maximum sensitivity.
PAGE 5
frequent erroneous measurements, and 0x60 for reduced sensitivity and fewer erroneous measurements.
PAGE 6
I2C Protocol Information The sensor module has a 7-bit slave address with a default value of 0x62 in hexadecimal notation. The effective 8 bit I2C address is: 0xC4 write, 0xC5 read. The device will not respond to a general call. Notes: • The ACK and NACK items are responses from the master device to the slave device. • The last NACK in the read is optional, but the formal I2C protocol states that the master shall not acknowledge the last byte.
PAGE 7
I2C Protocol Operation Read Operation This protocol description uses the term master to refer to the Arduino controller, and uses the term LIDAR device to refer to the LIDAR-Lite v3HP device acting as a slave on the I2C bus. When working with the I2C serial bus protocol, the device operates as follows: 1 The master initiates data transfer by establishing a start condition, which consists of a high-to-low transition on the SDA line while SCL is high.
PAGE 8
Detailed Control Register Definitions 3 0x00 2 1:0 NOTE: Unless otherwise noted, all registers contain one byte and are read and write. R/W Name Description Initial Value W ACQ_COMMAND Device command -- Bit 7:1 0 Function Write any non-zero value to start a measurement Performs a hard reset by reloading the FPGA and returning all registers to default values This operation must be enabled by writing 1 to bit 0 on register 0x06. When reset the I2C lines go into a high-z state for up to 10 ms.
PAGE 9
0x17 0x1e R/W Name Description Initial Value R/W Name Description Initial Value R UNIT_ID_LOW Serial number low byte Unique R/W I2C_CONFIG Default address response control 0x00 Bit 7:0 Function Unique serial number of device, high byte. Bit 5 Function 0: Disables the alternate status mode. 1: Enables an alternate indication status byte at STATUS register 0x01.
PAGE 10
Frequently Asked Questions 0x48 R/W Name Description Initial Value R HEALTH STATUS Used to diagnose major hardware issues at system initialization. -- Bit 4:0 3 2 Function Reference value is within normal range. Reference overflow occurred during the first acquisition. An initial acquisition was completed at wake-up to set the initial reference value. The receiver DC control command is within the normal range. DC regulation was successful during wake-up.
PAGE 11
• Aspect The aspect of the target, or its orientation to the sensor, affects the observable cross section and, therefore, the amount of returned signal decreases as the aspect of the target varies from the normal. • Reflectivity Reflectivity characteristics of the target’s surface also affect the amount of returned signal (How does the device work with reflective surfaces?, page 11).
PAGE 12
© 2018 Garmin Ltd. or its subsidiaries Garmin International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, USA Garmin (Europe) Ltd. Liberty House, Hounsdown Business Park, Southampton, Hampshire, SO40 9LR UK Garmin Corporation No. 68, Zhangshu 2nd Road, Xizhi Dist., New Taipei City, 221, Taiwan (R.O.C.) www.garmin.