Table of Contents Lidar Lite v3 Operation Manual and Technical Specifications 1 Laser Safety ......................................................................................................1 Documentation Revision Information .................................................................1 Specifications 2 Lidar Lite v3 Operation Manual Physical .............................................................................................................2 and Technical Specifications Electrical ............................................................................................................2 Performance ......................................................................................................2 Laser Safety Interface .............................................................................................................2 Laser ..................................................................................................................2 WARNING This device requires no regular maintenance. In the event that the device Connections 2 becomes damaged or is inoperable, repair or service must be handled by Wiring Harness ..................................................................................................2 authorized, factory-trained technicians only. Attempting to repair or service Connector ..........................................................................................................2 the unit on your own can result in direct exposure to laser radiation and the Connector Port Identification .......................................................................2 risk of permanent eye damage. For repair or service, contact your dealer or I2C Connection Diagrams .................................................................................3 Garmin for more information. This device should not be modified or operated Standard I2C Wiring ....................................................................................3 without its housing or optics. Operating this device without a housing and Standard Arduino I2C Wiring .......................................................................3 optics, or operating this device with modified housing or optics that expose the PWM Wiring .................................................................................................3 laser source, may result in direct exposure to laser radiation and the risk of permanent eye damage. Removal or modification of the diffuser in front of the PWM Arduino Wiring....................................................................................3 laser optic may result in the risk of permanent eye damage. Operational Information 4 Technology ........................................................................................................4 Use of controls or adjustments or performance of procedures other than those specified in this documentation may result in hazardous radiation exposure. Theory of Operation ...........................................................................................4 Garmin is not responsible for injuries caused through the improper use or Interface .............................................................................................................4 operation of this product. Initialization ..................................................................................................4 Power Enable Pin ........................................................................................4 CAUTION I2C Interface ................................................................................................4 This device emits laser radiation. This Laser Product is designated Class 1 Mode Control Pin .........................................................................................4 during all procedures of operation. This designation means that the laser is Settings ........................................................................................................4 safe to look at with the unaided eye, however it is advisable to avoid looking into the beam when operating the device and to turn off the module when not I2C Protocol Information 6 in use. I2C Protocol Operation ......................................................................................7 Register Definitions ...........................................................................................7 Control Register List ....................................................................................7 Documentation Revision Information Detailed Control Register Definitions ...........................................................8 Rev Date Changes Frequently Asked Questions 12 0A 09/2016 Initial release Must the device run on 5 Vdc Can it run on 3.3 Vdc instead .......................12 What is the spread of the laser beam ............................................................12 How do distance, target size, aspect, and reflectivity effect returned signal strength ..........................................................................................................12 How does the device work with reflective surfaces .......................................12 Diffuse Reflective Surfaces ........................................................................12 Specular Surfaces .....................................................................................12 How does liquid affect the signal ...................................................................13 1Specifications Connections Physical Wiring Harness Specification Measurement Size (LxWxH) 20 48 40 mm (0.8 1.9 1.6 in.) Weight 22 g (0.78 oz.) Operating temperature -20 to 60C (-4 to 140F) Electrical Wire Color Function Specification Measurement Red 5 Vdc (+) Power 5 Vdc nominal Orange Power enable (internal pull-up) 4.5 Vdc min., 5.5 Vdc max. Yellow Mode control Current consumption 105 mA idle Green I2C SCL 135 mA continuous operation Blue I2C SDA Black Ground (-) Performance There are two basic configurations for this device: Specification Measurement I2C (Inter-Integrated Circuit)a serial computer bus used to Range (70% reflective 40 m (131 ft) target) communicate between this device and a microcontroller, such as an Arduino board (I2C Interface, page 4). Resolution +/- 1 cm (0.4 in.) Accuracy < 5 m 2.5 cm (1 in.) typical* PWM (Pulse Width Modulation)a bi-directional signal transfer method that triggers acquisitions and returns distance measurements using the Accuracy 5 m 10 cm (3.9 in.) typical mode-control pin (Mode Control Pin, page 4). Mean 1% of distance maximum Ripple 1% of distance maximum Connector Update rate (70% 270 Hz typical Reflective Target) 650 Hz fast mode** You can create your own wiring harness if needed for your project or >1000 Hz short range only application. The needed components are readily available from many suppliers. Repetition rate ~50 Hz default 500 Hz max Part Description Manufacturer Part Number *Nonlinearity present below 1 m (39.4 in.) Connector 6-position, rectangular housing, JST GHR-06V-S housing latch-lock connector receptacle with **Reduced sensitivity a 1.25 mm (0.049 in.) pitch. Connector 26-30 AWG crimp socket connector JST SSHL-002T-P0.2 Interface terminal terminal (up to 6) Specification Measurement Wire UL 1061 26 AWG stranded copper N/A N/A User interface I2C Connector Port Identification PWM External trigger l2C interface Fast-mode (400 kbit/s) Default 7-bit address 0x62 Internal register access & control PWM interface External trigger input PWM output proportional to distance at 10 s/cm Laser Specification Measurement Wavelength 905 nm (nominal) Total laser power 1.3 W (peak) Mode of operation Pulsed (256 pulse max. pulse train) Item Pin Function Pulse width 0.5 s (50% duty Cycle) 1 5 Vdc (+) Pulse train repetition 10-20 KHz nominal frequency 2 Power enable (internal pull-up) Energy per pulse <280 nJ 3 Mode control Beam diameter at 12 2 mm (0.47 0.08 in.) 4 I2C SCL laser aperture 5 I2C SDA Divergence 8 mRadian 6 Ground (-) 2