Data Sheet

ManualsBrandsParallax ManualsInfrared & Light SensorsToF Laser PING 2m Rangefinder

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Sales: sales@parallax.com

Technical:support@parallax.com

Office: (916) 624-8333

Fax: (916) 624-8003

Sales: (888) 512-1024

Tech Support: (888) 997-8267

LaserPING Rangefinder

Module (#28041)

The LaserPING 2m Rangefinder provides an easy

method of distance measurement. This

near-infrared, time-of-flight (TOF) sensor is ideal for

taking measurements between moving or stationary

objects.

A single I/O pin is used to both query the LaserPING

sensor for its latest distance measurement, and to

read the reply.

The LaserPING 2m Rangefinder can be used with

nearly any microcontroller, utilizing its PWM mode or

optional serial mode. It is designed to be circuit- and

code-compatible with the PING))) Ultrasonic Distance

Sensor, making applications adaptable where

different environmental conditions need to be

considered. Measurements can even be taken

through an acrylic window to protect the sensor.

The sensor’s built-in co-processor ensures the right logic levels. Its I/O connections operate at

the same voltage supplied to the VIN pin, for compatibility with 3.3V and 5V microcontrollers.

Features

● Non-contact distance measurement with a 2 –200 cm range

● Factory pre-calibrated for accuracy with 1 mm resolution

● Eye-safe invisible near-infrared (IR) illumination using a class 1 laser emitter

● Reverse polarity protection if VIN and GND are accidentally swapped

● Onboard microprocessor handles complex sensor code

● Compatible with 3.3V and 5V microcontrollers

● Breadboard-friendly 3-pin SIP form-factor with mounting hole

LaserPING Rangefinder Module (#28041)

v1.0 1/29/2018 Page 1 of 8

Summary of content (8 pages)

PAGE 1
Web Site: www.parallax.com Office: (916) 624-8333 Forums: forums.parallax.com Fax: (916) 624-8003 Sales: sales@parallax.com Sales: (888) 512-1024 Technical:support@parallax.com Tech Support: (888) 997-8267 LaserPING Rangefinder Module (#28041) The LaserPING 2m Rangefinder provides an easy method of distance measurement. This near-infrared, time-of-flight (TOF) sensor is ideal for taking measurements between moving or stationary objects.
PAGE 2
Application Ideas ● ● ● ● ● ● Physics studies Security systems Interactive animated exhibits Robotics navigation and parking assistant systems Interactive applications such as hand detection and 1D gesture recognition Volume or height detection in process control systems Key Specifications ● ● ● ● ● ● ● ● ● ● ● ● Laser: 850 nm VCSEL (Vertical Cavity Surface Emitting Laser) Range: 2–200 cm Resolution: 1 mm Typical refresh rate: 15 Hz PWM mode, 22 Hz serial mode Power requirements: +3.
PAGE 3
Communication Protocol The sensor emits an infrared (IR) laser pulse which travels through the air, reflects off of objects and then bounces back to the sensor. The LaserPING module accurately measures how long the reflected laser pulse takes to return to the sensor, and converts this time measurement into millimeters, with a 1 mm resolution.
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The pulse width is proportional to the distance, and does not significantly change with the ambient temperature, pressure, or humidity. To convert the pulse width from time, in µs, to mm, use the following equation: Distance (mm) = Pulse Width (ms) × 171.5 To convert the pulse width from time, in µs, to inches, use the following equation: Distance (inches) = Pulse Width (ms) × 6.
PAGE 5
To stop serial mode and return to the default PWM mode: ● Assert the SIG pin low, and hold low for 100 ms ● Release the SIG pin (typically set your I/O pin that is connected to SIG back to high-impedance input mode) ● LaserPING will now be in PWM mode Enabling Serial on Start-up The 2 SMT pads marked DBG and SCK can be shorted together to change the default data mode, enabling serial mode on start-up. The LaserPING module checks the status of the DBG/SCK pins at power-up.
PAGE 6
Field of View (FoV) and Field of Illumination (FoI) The emitter and receiver elements of the laser sensor form a cone shape. The emitter field of illumination (FoI) is 23°, and the receiver field of vision (FoV) is 55°. The LaserPING sensor will only sense objects within the FoI, but may have reduced sensitivity when bright objects are within the FoV. Readings may also be inaccurate when mirrored surfaces within the FoI scatter light to other objects within the FoI or FoV.
PAGE 7
Pin Descriptions Pin Type Function GND Ground Common Ground (0 V supply) VIN Power The module will operate between 3.3V to 5V DC. The VIN voltage also sets the logic-high level voltage for the SIG pin. SIG I/O* PWM or Serial data input / output * When in PWM mode, the SIG pin operates as an open collector input, with a 55 k-ohm pull-down resistor, except for response pulses, which are driven to VIN. When in serial mode, the SIG pin operates as a push-pull output.
PAGE 8
Cover Glass Selection Guide The LaserPING module has a mounting hole positioned to simplify fitting an optional cover glass. This could be used to protect the sensor in certain applications, or to experiment with the impact of different materials acting as filters on the infrared laser light.