This is a remix of a 12 key Macro Pad. I cannot find who made the original or the original itself (If the original resurfaces I would love to Credit or even take this down if requested). This is meant to be used with cherry mx switches and an Arduino Micro. I have included simple modified version of code that I got from Dave Madison (https://www.partsnotincluded.com/diy-stream-deck-mini-macro-keyboard/) to work with a 12 keys instead of 8. I have included a circuit diagram to help with soldering.

The Case and the Base Snap fit together to assemble, and keys are press fit into respective openings.

Code for Arduino

// Key definitions
#define BUTTON_KEY1 KEY_F13
#define BUTTON_KEY2 KEY_F14
#define BUTTON_KEY3 KEY_F15

#define BUTTON_KEY4 KEY_F16
#define BUTTON_KEY5 KEY_F17
#define BUTTON_KEY6 KEY_F18
#define BUTTON_KEY7 KEY_F19
#define BUTTON_KEY8 KEY_F20
#define BUTTON_KEY9 KEY_F21
#define BUTTON_KEY10 KEY_F22
#define BUTTON_KEY11 KEY_F23
#define BUTTON_KEY12 KEY_F24

// Pin definitions
#define BUTTON_PIN1 2
#define BUTTON_PIN2 3
#define BUTTON_PIN3 4
#define BUTTON_PIN4 5
#define BUTTON_PIN5 6
#define BUTTON_PIN6 7
#define BUTTON_PIN7 8
#define BUTTON_PIN8 9
#define BUTTON_PIN5 10
#define BUTTON_PIN6 11
#define BUTTON_PIN7 12
#define BUTTON_PIN8 13
// ---------------------------------

#include "Keyboard.h"

// Button helper class for handling press/release and debouncing
class button {
public:
const char key;
const uint8_t pin;

button(uint8_t k, uint8_t p) : key(k), pin(p){}

void press(boolean state){
if(state == pressed || (millis() - lastPressed <= debounceTime)){
return; // Nothing to see here, folks
}

lastPressed = millis();

state ? Keyboard.press(key) : Keyboard.release(key); 
pressed = state;
}

void update(){
press(!digitalRead(pin));
}

private:
const unsigned long debounceTime = 30;
unsigned long lastPressed = 0;
boolean pressed = 0;
} ;

// Button objects, organized in array
button buttons[] = {
{BUTTON_KEY1, BUTTON_PIN1},
{BUTTON_KEY2, BUTTON_PIN2},
{BUTTON_KEY3, BUTTON_PIN3},
{BUTTON_KEY4, BUTTON_PIN4},
{BUTTON_KEY5, BUTTON_PIN5},
{BUTTON_KEY6, BUTTON_PIN6},
{BUTTON_KEY7, BUTTON_PIN7},
{BUTTON_KEY8, BUTTON_PIN8},
{BUTTON_KEY9, BUTTON_PIN9},
{BUTTON_KEY10, BUTTON_PIN10},
{BUTTON_KEY11, BUTTON_PIN11},
{BUTTON_KEY12, BUTTON_PIN12},

};

const uint8_t NumButtons = sizeof(buttons) / sizeof(button);
const uint8_t ledPin = 17;

void setup() { 
// Safety check. Ground pin #1 (RX) to cancel keyboard inputs.
pinMode(1, INPUT_PULLUP);
if(!digitalRead(1)){
failsafe();
}

// Set LEDs Off. Active low.
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, HIGH);
TXLED0;

for(int i = 0; i < NumButtons; i++){
pinMode(buttons[i].pin, INPUT_PULLUP);
}
}

void loop() {
for(int i = 0; i < NumButtons; i++){
buttons[i].update();
}
}

void failsafe(){
for(;;){} // Just going to hang out here for awhile :D
}