Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodENC™ Reference Manual

Revised January 20, 2016

This manual applies to the PmodENC rev. A

DOC#: 502-117

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

Page 1 of 3

Overview

The Digilent PmodENC features a rotary shaft encoder with an integral push-button to provide multiple types of

outputs. The module also includes a sliding switch that is commonly used as an on/off output. An encoder is

commonly used in freely rotating volume knobs to detect how many “clicks” a knob has been rotated.

1 Functional Description

The PmodENC utilizes a rotary shaft encoder as a way for users to quickly switch between multiple options such as

choices shown on a screen or predefined motors speeds. An integral push-button on the shaft as well as a slide

switch allow for a highly configurable Pmod.

2 Interfacing with the Pmod

The PmodENC communicates with the host board via the GPIO protocol. It provides four inputs to the system

board; the two buttons internal to the encoder that are in quadrature with each other as well as the integral push

button on the shaft and the slide switch. A system board will read the integral push button and the slide switch at

a logic low voltage in their native (or off in the case of the switch) states.

The PmodENC.

 Rotary push-button shaft encoder

 Add multiple types of user input to host

board or project

 Additional static slide switch

 Small PCB size for flexible designs 1.5 in ×

0.8 in (3.8 cm × 2.0 cm)

 6-pin Pmod connector with GPIO interface

 Follows Digilent Pmod Interface

Specification Type 1

 Library and example code available

in resource center

Features include:

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodENC™ Reference Manual Revised January 20, 2016 This manual applies to the PmodENC rev. A Overview The Digilent PmodENC features a rotary shaft encoder with an integral push-button to provide multiple types of outputs. The module also includes a sliding switch that is commonly used as an on/off output. An encoder is commonly used in freely rotating volume knobs to detect how many “clicks” a knob has been rotated.
PAGE 2
PmodENC™ Reference Manual The two internal buttons are both natively pulled to a logic high level through a pull-up resistor. As the two buttons are located 90 degrees from each other (i.e. in quadrature), while the shaft is rotating one button will be pulled to a low logic level voltage before the other button. Figure 1. Rotary shaft encoder circuitry.
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PmodENC™ Reference Manual 3 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.5 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.