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Rotary Encoder Using Arduino

Made by hIOTron / IoT

About the project

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

Project info

Difficulty: Moderate

Platforms: Arduino

Estimated time: 1 day

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	Standard LCD 16x2 white on blue	x 1
	Rotary Potentiometer Module	x 1
	Jumper Wire Kit - 140pcs	x 1
	Resistor Network - 10K Ohm (6-pin bussed)	x 1
	Arduino MKRFOX 1200	x 1

Software apps and online services

Arduino IDE

Story

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.

Build such IoT Projects using Arduino with the help of the Internet of Things Course Training

Code

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 <LiquidCrystal.h>  //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

  delay(2000);
  lcd.clear();

//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.clear();  
       lcd.print(Encoder_Count);
       lcd.setCursor(0, 1);  
       lcd.print("Clockwise");
     } 
     else 
     {
       Encoder_Count--;
       lcd.clear();  
       lcd.print(Encoder_Count);
       lcd.setCursor(0, 1);  
       lcd.print("Anti - Clockwise");
     }
   }

   Previous_Output = digitalRead(Encoder_OuputA);

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

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Rotary Encoder Using Arduino

About the project

Project info