EC11_Rotary_Encoder_Module_SKU_

Introduction

DFRobot 360 degree rotary encoder module is designed based on EC11 rotary encoder button. This module has three signal terminals: terminal A & B is encoder output; terminal C is button signal output. It is very suitable for applications such as volume knob, lighting adjustment. The rotary encoder module comes with XH2.54 bonding pad, easy to be used in prototyping projects, like automotive electronics, multimedia speakers, instrumentation, smart home and other fields.

Specification

Operating Voltage: 3.3V ~ 5V
Full Rotation Angle: 360 degrees (no stop point)
Number of pulse: 20
Rotation Life: 30000 ± 200 Cycles
Contact Resistance: ≤ 100mΩ
Insulation Resistance: 100MΩ or more
Oscillation: <10ms Press
Working Temperature: -30 ℃ ~ 80 ℃
Module Size: 33.8 * 22.4 (mm) /1.3 * 1.1 (inches)
Weight: 14g

Board Overview

EC11 Rotary Encoder Module

Num	Label	Description
1	VCC	3.3~5V
2	GND	GND
3	A	Encoder-phase A
4	B	Encoder-phase B
5	C	Button

CW Direction: phase A B signal: A B Pulse Output

Tutorial

Requirements

Hardware
- DFRduino UNO (or similar) x 1
- XXX x #
- M-M/F-M/F-F Jumper wires

Software
- Arduino IDE (Version requirements: V1.6.?), [https://www.arduino.cc/en/software| Click to Download Arduino IDE from Arduino®]

Connection Diagram

EC11 Arduino Connection

Sample Code

int encoderPinA = 2;
int encoderPinB = 3;
int buttonPin = 4;

volatile int lastEncoded = 0;
volatile long encoderValue = 0;

long lastencoderValue = 0;

int lastMSB = 0;
int lastLSB = 0;

long readEncoderValue(void){
    return encoderValue/4;
}

boolean isButtonPushDown(void){
  if(!digitalRead(buttonPin)){
    delay(5);
    if(!digitalRead(buttonPin))
      return true;
  }
  return false;
}

void setup() {
  Serial.begin (9600);

  pinMode(encoderPinA, INPUT);
  pinMode(encoderPinB, INPUT);
  pinMode(buttonPin, INPUT);

  digitalWrite(encoderPinA, HIGH); //turn pullup resistor on
  digitalWrite(encoderPinB, HIGH); //turn pullup resistor on

  //call updateEncoder() when any high/low changed seen
  //on interrupt 0 (pin 2), or interrupt 1 (pin 3)
  attachInterrupt(0, updateEncoder, CHANGE);
  attachInterrupt(1, updateEncoder, CHANGE);

}

void loop(){
  //Do stuff here

  if(isButtonPushDown()){
    Serial.println("you push button down!!!");
  }
  Serial.println(readEncoderValue());
  delay(50); //just here to slow down the output, and show it will work  even during a delay
}


void updateEncoder(){
  int MSB = digitalRead(encoderPinA); //MSB = most significant bit
  int LSB = digitalRead(encoderPinB); //LSB = least significant bit

  int encoded = (MSB << 1) |LSB; //converting the 2 pin value to single number
  int sum  = (lastEncoded << 2) | encoded; //adding it to the previous encoded value

  if(sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue   ;
  if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue --;

  lastEncoded = encoded; //store this value for next time
}

Expected Results

Clockwise Rotation: 1
Anticlockwise Rotation: -1
Press the Button: you push button down

Printing Info.

FAQ

For any questions, advice or cool ideas to share, please visit the DFRobot Forum.

EC11_Rotary_Encoder_Module_SKU__SEN0235-DFRobot