• Cursor pad on the left
• 1 till 5 (see below)
• star + 1-5, rates 1 till 5 stars
• outline star – removes rating
• bookmark + 1-5, color marks image
• Triangle – start slideshow
• zoom-in, rotate CCW, reset zoom, rotate CW, zoom-out
• previous image, open image, fullscreen, exit fullscreen to manager and next image

I’ve used a esp32 with 18650 battery holder.

I still have to 3d print a case 🙂

Code:

#include <BleConnectionStatus.h>
#include <BleKeyboard.h>
#include <KeyboardOutputCallbacks.h>

#define DEBUG 0micro joystick
#define STAR 16
#define FLAG 17
#define COL1 18
#define COL2 19
#define COL3 21
#define COL4 22
#define COL5 23
#define COL6 25
#define ROW1 26
#define ROW2 27
#define ROW3 32
#define ROW4 33

int flagstate = 0;
int starstate = 0;
int row1state = 0;
int row2state = 0;
int row3state = 0;
int row4state = 0;
int col1state = 0;
int col2state = 0;
int col3state = 0;
int col4state = 0;
int col5state = 0;
int col6state = 0;

int colstate = 1;

BleKeyboard bleKeyboard;

void setup() {
#ifdef DEBUG
  Serial.begin(9600);
#endif
  bleKeyboard.begin();
  pinMode(STAR, INPUT_PULLUP);
  pinMode(FLAG, INPUT_PULLUP);
  pinMode(ROW1, INPUT_PULLUP);
  pinMode(ROW2, INPUT_PULLUP);
  pinMode(ROW3, INPUT_PULLUP);
  pinMode(ROW4, INPUT_PULLUP);
  pinMode(COL1, OUTPUT);
  pinMode(COL2, OUTPUT);
  pinMode(COL3, OUTPUT);
  pinMode(COL4, OUTPUT);
  pinMode(COL5, OUTPUT);
  pinMode(COL6, OUTPUT);
}
void loop() {
#ifdef DEBUG
  Serial.print("Colstate : ");
  Serial.print(colstate);
  Serial.print('\n');
#endif

  if (colstate == 1) {
    digitalWrite(COL1, LOW);
    digitalWrite(COL2, HIGH);
    digitalWrite(COL3, HIGH);
    digitalWrite(COL4, HIGH);
    digitalWrite(COL5, HIGH);
    digitalWrite(COL6, HIGH);
  }
  if (colstate == 2) {
    digitalWrite(COL1, HIGH);
    digitalWrite(COL2, LOW);
    digitalWrite(COL3, HIGH);
    digitalWrite(COL4, HIGH);
    digitalWrite(COL5, HIGH);
    digitalWrite(COL6, HIGH);
  }
  if (colstate == 3) {
    digitalWrite(COL1, HIGH);
    digitalWrite(COL2, HIGH);
    digitalWrite(COL3, LOW);
    digitalWrite(COL4, HIGH);
    digitalWrite(COL5, HIGH);
    digitalWrite(COL6, HIGH);
  }
  if (colstate == 4) {
    digitalWrite(COL1, HIGH);
    digitalWrite(COL2, HIGH);
    digitalWrite(COL3, HIGH);
    digitalWrite(COL4, LOW);
    digitalWrite(COL5, HIGH);
    digitalWrite(COL6, HIGH);
  }
  if (colstate == 5) {
    digitalWrite(COL1, HIGH);
    digitalWrite(COL2, HIGH);
    digitalWrite(COL3, HIGH);
    digitalWrite(COL4, HIGH);
    digitalWrite(COL5, LOW);
    digitalWrite(COL6, HIGH);
  }
  if (colstate == 6) {
    digitalWrite(COL1, HIGH);
    digitalWrite(COL2, HIGH);
    digitalWrite(COL3, HIGH);
    digitalWrite(COL4, HIGH);
    digitalWrite(COL5, HIGH);
    digitalWrite(COL6, LOW);
  }
  delay (100);
  flagstate = digitalRead(FLAG);
  starstate = digitalRead(STAR);
  row1state = digitalRead(ROW1);
  row2state = digitalRead(ROW2);
  row3state = digitalRead(ROW3);
  row4state = digitalRead(ROW4);
#ifdef DEBUG
  Serial.print("Rowstates : ");
  Serial.print(row1state);
  Serial.print(row2state);
  Serial.print(row3state);
  Serial.print(row4state);
  Serial.print('\n');
#endif
  // ROW1 = UP,DOWN,LEFT,RIGHT
  if (bleKeyboard.isConnected() && colstate == 1) {
    // UP
#ifdef DEBUG
    Serial.print("Up Pressed ");
    Serial.print('\n');
#endif

    if (row1state == 0) {
      bleKeyboard.press(KEY_UP_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
    // DOWN
    if (row2state == 0) {
      bleKeyboard.press(KEY_DOWN_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
    // LEFT
    if (row3state == 0) {
      bleKeyboard.press(KEY_LEFT_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
    // RIGHT
    if (row4state == 0) {
      bleKeyboard.press(KEY_RIGHT_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
  }
  // ROW2 = (1),(star),ZOOMIN,PREVIOUS
  if (bleKeyboard.isConnected() && colstate == 2) {
    // 1 - star
    if (row1state == 0 && starstate == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press('1');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // 1 - flag
    if (row1state == 0 && flagstate == 0) {
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press('1');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // NO ROWSTATE2

    // zoom in
    if (row3state == 0) {
      bleKeyboard.press('+');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // PREVIOUS
    if (row4state == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press(KEY_LEFT_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
  }
  // ROW3 = (2),unstar,CCWrotate,open
  if (bleKeyboard.isConnected() && colstate == 3) {
    // 2 - star
    if (row1state == 0 && starstate == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press('2');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // 2 - flag
    if (row1state == 0 && flagstate == 0) {
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press('2');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // unstar
    if (row2state == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press('0');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // CCW rotate
    if (row3state == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press(KEY_LEFT_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
    // open
    if (row4state == 0) {
      bleKeyboard.press(KEY_RETURN);
      delay (100);
      bleKeyboard.releaseAll();
    }
  }

  // ROW4 = (3),(flag),zoom,fullscreen
  if (bleKeyboard.isConnected() && colstate == 4) {
    // 3 - star
    if (row1state == 0 && starstate == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press('3');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // 3 - flag
    if (row1state == 0 && flagstate == 0) {
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press('3');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // NO ROWSTATE2

    // zoom reset
    if (row3state == 0) {
      bleKeyboard.press('*');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // fullscreen
    if (row4state == 0) {
      bleKeyboard.press('f');
      delay (100);
      bleKeyboard.releaseAll();
    }
  }

  // ROW5 = (4),unflag,CWrotate,exit
  if (bleKeyboard.isConnected() && colstate == 5) {
    // 4 - star
    if (row1state == 0 && starstate == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press('4');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // 4 - flag
    if (row1state == 0 && flagstate == 0) {
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press('4');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // unflag
    if (row2state == 0) {
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press('0');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // CW rotate
    if (row3state == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press(KEY_RIGHT_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
    // exit
    if (row4state == 0) {
      bleKeyboard.press(KEY_ESC);
      delay (100);
      bleKeyboard.releaseAll();
    }
  }

  // ROW6 = (5),slideshow,zoomout,next
  if (bleKeyboard.isConnected() && colstate == 6) {
    // 5 - star
    if (row1state == 0 && starstate == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press('5');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // 5 - flag
    if (row1state == 0 && flagstate == 0) {
      bleKeyboard.press(KEY_LEFT_ALT);
      bleKeyboard.press('5');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // slideshow
    if (row2state == 0) {
      bleKeyboard.press(KEY_ESC);
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press('s');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // zoom out
    if (row3state == 0) {
      bleKeyboard.press('-');
      delay (100);
      bleKeyboard.releaseAll();
    }
    // next
    if (row4state == 0) {
      bleKeyboard.press(KEY_LEFT_CTRL);
      bleKeyboard.press(KEY_RIGHT_ARROW);
      delay (100);
      bleKeyboard.releaseAll();
    }
  }
  colstate++;
  if (colstate == 7) {
    colstate = 1;
  }
}