Rotary Encoder using Arduino

The rotary encoder supports the user to interact with the system and in this project, we interface it with Arduino.

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The project describes how to interface a rotary encoder with Arduino.

About the Project:

A Rotary Encoder basically is an electromechanical transducer that converts mechanical movements into electronic pulses. It contains a knob which when moves step by step and generates a sequence of pulse trains with a predefined width

The various types of encoders are rated depends upon the Output signal and sensing technology. The Encoder utilized here is an Incremental type of Encoder.

Rotary Encoder with Arduino

Once the hardware is ready, you need to just upload the code to the Arduino board and power up the Arduino Board. Power it with the help of the USB cable or a 12V adapter. When it gets powered the LCD should display the message and then get blank. Then rotate the rotary encoder and you can see the value start incremented or decremented depends on the direction you rotate. You can see below image.

And when the button is pressed, the second line will display that the button is pressed.

  • 1 × Arduino UNO & Genuino UNO
  • 1 × Single Turn Potentiometer- 10k ohms
  • 1 × Rotary Encoder (KY-040)
  • 1 × LCD 16X2

  • 1
    Run a Program

    * Power LCD and Rotary encoder from the +5V pin of Arduino
    * LCD RS -> pin 7
    * LCD EN -> pin 6
    * LCD D4 -> pin 5
    * LCD D5 -> pin 4
    * LCD D6 -> pin 3
    * LCD D7 -> pin 2
    * Encoder Switch -> pin 10
    * Encoder Output A -> pin 9
    * Encoder Output B -> pin 8

    int Encoder_OuputA = 9;
    int Encoder_OuputB = 8;
    int Encoder_Switch = 10;

    int Previous_Output;
    int Encoder_Count;

    #include //Default Arduino LCD Librarey is included

    const int rs = 7, en = 6, d4 = 5, d5 = 4, d6 = 3, d7 = 2; //Mention the pin number for LCD connection
    LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

    void setup() {
    lcd.begin(16, 2); //Initialise 16*2 LCD

    lcd.print(" Rotary Encoder "); //Intro Message line 1
    lcd.setCursor(0, 1);
    lcd.print(" With Arduino "); //Intro Message line 2


    //pin Mode declaration
    pinMode (Encoder_OuputA, INPUT);
    pinMode (Encoder_OuputB, INPUT);
    pinMode (Encoder_Switch, INPUT);

    Previous_Output = digitalRead(Encoder_OuputA); //Read the inital value of Output A

    void loop() {
    //aVal = digitalRead(pinA);

    if (digitalRead(Encoder_OuputA) != Previous_Output)
    if (digitalRead(Encoder_OuputB) != Previous_Output)
    Encoder_Count ++;
    lcd.setCursor(0, 1);
    lcd.setCursor(0, 1);
    lcd.print("Anti - Clockwise");

    Previous_Output = digitalRead(Encoder_OuputA);

    if (digitalRead(Encoder_Switch) == 0)
    lcd.setCursor(0, 1);
    lcd.print("Switch pressed");

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