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PmodLS1™ Reference Manual
Revised May 26, 2016
This manual applies to the PmodLS1 rev. B
Overview
The Digilent PmodLS1 allows users to receive signals from multiple optical sensors, such as the popular
combination of an IR LED with an IR sensor used in line-following robots.
Features include:
Infrared light detector with on-board
sensitivity adjustment
Interface with up to four reflective or
transmissive photo detectors
Works with Digilent IR Proximity Sensor
Small PCB size for flexible designs 1.4“ ×
0.8” (3.6 cm × 2.0 cm)
6-pin Pmod connector with GPIO interface
Follows
Digilent Pmod Interface
Specification
Type 1
The PmodLS1.
1
Functional Description
The PmodLS1 is designed to be used with up to four sensors containing an infrared LED and an infrared-sensitive
photo-transistor, such as the IR Proximity Sensor available from Digilent. When using Digilent's sensors, refer to
the print on the board indicating the wire color for the correct orientation of the wire. If third-party sensors are
used, refer to the board schematic available at www.digilentinc.com for the proper connection of the LED and
photo-transistor.
The module uses analog comparators to determine when the infrared detectors have sensed more infrared light
than the threshold limit. The sensitivity of the sensors can be adjusted by adjusting the onboard potentiometer.
2
Interfacing with the Pmod
The PmodLS1 communicates with the host board via the GPIO protocol. By the Pmod design, each of the outputs
will only send a logic 1 value when its sensor is picking up more optical light than the threshold limit. When the
DOC#: 502-068
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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PmodLS1™ Reference Manual
light level is lower than the threshold limit, the output will instead send a logic 0 value. This style can then be
connected to an interrupt within the system board for an ideal usage, although this is not necessary.
Pin Number
1
2
3
4
5
6
Description
Sensor S1
Sensor S2
Sensor S3
Sensor S4
Ground
VCC
Table 1. Pin descriptions.
Any external power applied to the PmodLS1 needs to be between 2.7V and 5.5V to ensure that no internal
components on the Pmod are damaged. Digilent recommends operating this Pmod at 3.3V.
3
Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1.375 inches long on the sides parallel to the pins
on the pin header and 0.8 inches long on the sides perpendicular to the pin header.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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