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IDUINO for Maker’s life

Rotary Encode Module (SE055)

Introduction

Rotary encoder is a rotary input device (as in knob) that provides an indication

of how much the knob has been rotated AND what direction it is rotating in.It’s

a great device for stepper and servo motor control. You could also use it to

control devices like digital potentiometers.

Specification

 Operation voltage: 5V

 5Pinout

 Size:32*20*30mm

 Weight: 8g

Pinout

Description

CLK

Encoder A

Encoder B

Switch button

Power(5V DC)

Gnd

Ground

Summary of content (6 pages)

PAGE 1
IDUINO for Maker’s life Rotary Encode Module (SE055) Introduction Rotary encoder is a rotary input device (as in knob) that provides an indication of how much the knob has been rotated AND what direction it is rotating in.It’s a great device for stepper and servo motor control. You could also use it to control devices like digital potentiometers.
PAGE 2
IDUINO for Maker’s life Rotary Encoder Basics A rotary encoder has a fixed number of positions per revolution. These positions are easily felt as small “clicks” you turn the encoder.This module has thirty of these positions. On one side of the switch there are three pins. They are normally referred to as A, B and C. In the case of the SE055, they are oriented as shown. Inside the encoder there are two switches. Once switch connects pin A to pin C and the other switch connects pin B to C.
PAGE 3
IDUINO for Maker’s life As you can see, the angular position of the A terminal and the B terminal is such that: • Rotating the switch clockwise will cause the switch connecting A and C to change states first. • Rotating the switch counterclockwise will cause the switch connecting B and C to change states first. If we were to represent the opening an closing of the switches as wave forms, it would look something like this.
PAGE 4
IDUINO for Maker’s life Rotary Encode Schematic Example This is a simple sketch that shows how to count the encoder position and how to determine direction of rotation. It has no switch debounce, nor does it use interrupts. A fully developed application might need to incorporate these in order to make it robust.
PAGE 5
IDUINO for Maker’s life ******Code Begin****** int pinA = 3; // Connected to CLK int pinB = 4; // Connected to DT int encoderPosCount = 0; int pinALast; int aVal; boolean bCW; void setup() { pinMode (pinA,INPUT); pinMode (pinB,INPUT); /* Read Pin A Whatever state it's in will reflect the last position */ pinALast = digitalRead(pinA); Serial.
PAGE 6
IDUINO for Maker’s life bCW = true; } else {// Otherwise B changed first and we're moving CCW bCW = false; encoderPosCount--; } Serial.print ("Rotated: "); if (bCW){ Serial.println ("clockwise"); }else{ Serial.println("counterclockwise"); } Serial.print("Encoder Position: "); Serial.