WIRING of KY-040 Rotary Encoder plus Demo Code

Other Hardware General Electronics
19

Hi, guys! My version of code

volatile boolean TurnDetected;
volatile boolean up;
static long virtualPosition=0;    // without STATIC it does not count correctly!!!

const int PinCLK=2;                   // Used for generating interrupts using CLK signal
const int PinDT=3;                    // Used for reading DT signal
const int PinSW=4;                    // Used for the push button switch

void isr ()  {                    // Interrupt service routine is executed when any CHANGE transition is detected on CLK
    volatile boolean CLK = digitalRead(PinCLK);
    volatile boolean DT = digitalRead(PinDT);
    up=((!CLK && DT)||(CLK && !DT));
   
    TurnDetected = true;
}

void setup ()  {
 pinMode(PinCLK,INPUT);
 pinMode(PinDT,INPUT);  
 pinMode(PinSW,INPUT);
 attachInterrupt (0,isr,CHANGE);   // interrupt 0 is always connected to pin 2 on Arduino UNO
 Serial.begin (9600);
 Serial.println("Start");
}

void loop ()  {

 if (!digitalRead(PinSW)) {      // check if pushbutton is pressed
   virtualPosition=0;              // if YES, then reset counter to ZERO
   Serial.print ("Reset = ");      // Using the word RESET instead of COUNT here to find out a buggy encoder
   Serial.println (virtualPosition);
 }  
 
 if (TurnDetected)  {       // do this only if rotation was detected
     if (up)
     virtualPosition++;
   else
     virtualPosition--;
   TurnDetected = false;          // do NOT repeat IF loop until new rotation detected
   Serial.print ("Count = ");  
   Serial.println (virtualPosition);
 }
}

encoder01.ino (1.47 KB)