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Connections
The LRF Module interfaces to any host microcontroller or computer system using only four connections
(GND, VCC, SOUT, SIN).
Pin
Name
Type
1
GND
G
2
VCC
P
3
SOUT
O
4
SIN
I
Type: I = Input, O = Output, P = Power, G = Ground
Use the following example circuit for connecting the Parallax Laser Range Finder Module:
Usage
The LRF Module is controlled by the host via a serial communications interface. To use, simply align the
LRF Module towards the target object and send the desired command.
The serial interface is configured for 8 data bits, no parity, 1 stop bit (8N1). Automatic baud rate
detection occurs on initial power-up of the LRF Module. The Module waits for a "U" character to be sent
Copyright © Parallax Inc.
Function
System ground. Connect to power supply's ground (GND) terminal.
System power, 5 VDC input.
Serial output to host. 5 V TTL-level interface, non-inverted, 8 data bits, no
parity, 1 stop bit, baud rate matched to host.
Note: The LRF Module hardware design provides bidirectional communication
capability for the SOUT pin. This allows the use of a standard three-pin servo
extension cable (Parallax #805-00001) for connecting the LRF Module to the
host. However, bidirectional communication requires changes to the LRF
Module firmware, not currently supported by Parallax.
Serial input from host. 3.3 V to 5 V TTL-level interface, non-inverted, 8 data
bits, no parity, 1 stop bit, baud rate matched to host.
Parallax Laser Range Finder (#28044)
v1.0 9/16/2011 Page 2 of 24
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