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Hardware Design
The LRF Module's major hardware components include:
Parallax Propeller P8X32A-Q44
OmniVision OVM7690 640x480 CMOS CameraCube
Arima APCD-635-02-C3-A Laser Diode
Assembly Drawing
All components are mounted on the back side of the board with the exception of the camera and laser
diode. The center points of the camera and laser diode are 78 mm apart.
On the back side of the LRF Module, the Propeller (U2), its supporting electronics, and the camera
interface circuitry are located on the right and the laser diode control circuitry is on the left. A dotted line
(not printed on the actual LRF Module) indicates the recommended cutting point if the user wishes to
separate the laser diode control circuitry from the rest of the LRF for custom projects.
A Prop Plug (Parallax #32201) can attach to the four pads (JP2) on the back of the LRF in order to
reprogram the Propeller's firmware using the Parallax Propeller Tool software. Calibration and parametric
data will remain intact provided the same major version of firmware is loaded. Otherwise, the LRF will
need to be re-calibrated using the "X" command (for example, if upgrading from firmware version 1.0 to
2.0).
Eight unused GPIO pins (P16-P23) are available via surface mount pads near the Propeller. The pins are
spaced to support a dual-row, 0.1" male header.
Copyright © Parallax Inc.
Parallax Laser Range Finder (#28044)
v2.0 10/31/2015 Page 15 of 23
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