Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodLS1™ Reference Manual

Revised February 13, 2015

This manual applies to the PmodLS1 rev. B

DOC#: 502-068

Other product and company names mentioned may be trademarks of their respective owners.

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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.

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

The PmodLS1.

 Up to four attached sensors

 An adjustable gain (threshold) for the

sensors

Features include:

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300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodLS1™ Reference Manual Revised February 13, 2015 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:   Up to four attached sensors An adjustable gain (threshold) for the sensors The PmodLS1.
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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.