combine code request

[yo2ldk]

Hi Jallwine,

searching something for my project, I found you nice code who made something I need, and I have the same encoder.
Can you help me (as I'm more hardware than programmer) to declare two encoders and combine your codes for volume and up/down ?
I need to use two or even three encoders, one like yours and the others the usual type, to send this
keyboard command with them. I tryed but always have errors and cannot compile
Thank you in advance for your time

[jallwine]

I haven't tested this, but it should be pretty straight forward to add a second encoder using an Arduino Micro or any Arduino with a 32U4 chip by connecting the second encoder to pins 0 and 1. It gets a little trickier with 3 or more encoders as there aren't enough interrupt pins to handle more encoders. I think it would be possible to do so using pin change interrupt handlers, but I don't have any experience with that (its something I'll try to experiment with soon). For now, you can try this:

#include "HID-Project.h"

int pinA = 2;
int pinB = 3;

volatile int previous = 0;
volatile int counter = 0;

int pinA2 = 0;
int pinB2 = 1;

volatile int previous2 = 0;
volatile int counter2 = 0;

void setup() {
  pinMode(pinA, INPUT_PULLUP); 
  pinMode(pinB, INPUT_PULLUP);
  pinMode(pinA2, INPUT_PULLUP); 
  pinMode(pinB2, INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(pinA), changed, CHANGE); 
  attachInterrupt(digitalPinToInterrupt(pinB), changed, CHANGE);

  attachInterrupt(digitalPinToInterrupt(pinA2), changed2, CHANGE); 
  attachInterrupt(digitalPinToInterrupt(pinB2), changed2, CHANGE);
  
  Keyboard.begin();
}

void changed() {
  int A = digitalRead(pinA); 
  int B = digitalRead(pinB);

  int current = (A << 1) | B;
  int combined  = (previous << 2) | current;
   
  if(combined == 0b0010 || 
     combined == 0b1011 ||
     combined == 0b1101 || 
     combined == 0b0100) {
    counter++;
  }
   
  if(combined == 0b0001 ||
     combined == 0b0111 ||
     combined == 0b1110 ||
     combined == 0b1000) {
    counter--;
  }

  previous = current;
}

void changed2() {
  int A = digitalRead(pinA2); 
  int B = digitalRead(pinB2);

  int current = (A << 1) | B;
  int combined  = (previous2 << 2) | current;
   
  if(combined == 0b0010 || 
     combined == 0b1011 ||
     combined == 0b1101 || 
     combined == 0b0100) {
    counter2++;
  }
   
  if(combined == 0b0001 ||
     combined == 0b0111 ||
     combined == 0b1110 ||
     combined == 0b1000) {
    counter2--;
  }

  previous2 = current;
}

void loop(){ 
  if(counter >= 4) {
    Keyboard.write(KEY_VOLUME_UP);
    counter -= 4;
  } else if(counter <= -4) {
    Keyboard.write(KEY_VOLUME_DOWN);

    counter += 4;
  } 
  if(counter2 >= 4) {
    Keyboard.write(KEY_UP);
    counter -= 4;
  } else if(counter2 <= -4) {
    Keyboard.write(KEY_DOWN);

    counter += 4;
  } 
}