diff --git a/platformio.ini b/platformio.ini
index e4c2d7f..4237be9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -8,6 +8,9 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
+[env]
+lib_deps = HID-Project
+
 [env:sparkfun_promicro16]
 platform = atmelavr
 board = sparkfun_promicro16
diff --git a/res/ProMicro16MHzv2.pdf b/res/ProMicro16MHzv2.pdf
new file mode 100644
index 0000000..bab4180
Binary files /dev/null and b/res/ProMicro16MHzv2.pdf differ
diff --git a/src/main.cpp b/src/main.cpp
index 58b344c..74e9838 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,9 +1,44 @@
 #include <Arduino.h>
+#include <HID-Project.h>
+
+#define NUM_KEYS 12
+
+uint8_t const pin_lr{2};
+uint8_t const pin_rr{A3};
+uint8_t const pin_left{5};
+uint8_t const pin_up{3};
+uint8_t const pin_down{7};
+uint8_t const pin_right{6};
+uint8_t const pin_y{A2};
+uint8_t const pin_x{15};
+uint8_t const pin_b{A0};
+uint8_t const pin_a{14};
+uint8_t const pin_select{9};
+uint8_t const pin_start{10};
+
+uint8_t const pin_array[] = {pin_lr, pin_rr, pin_left         , pin_up         , pin_right         , pin_down         , pin_y, pin_x, pin_b, pin_a, pin_select, pin_start};
+int     const key_array[] = {'r'   , 'l'   , GAMEPAD_DPAD_LEFT, GAMEPAD_DPAD_UP, GAMEPAD_DPAD_RIGHT, GAMEPAD_DPAD_DOWN, 'y'  , 'x'  , 'b'  , 'a'  , KEY_RETURN, ' '      };
+bool          states   [] = {LOW   , LOW   , LOW              , LOW            , LOW               , LOW              , LOW  , LOW  , LOW  , LOW  , LOW       , LOW      };
 
 void setup() {
-  // put your setup code here, to run once:
+  Gamepad.begin();
+  for (size_t i = 0; i < NUM_KEYS; ++i) {
+    pinMode(pin_array[i], INPUT_PULLUP);
+    states[i] = digitalRead(pin_array[i]);
+  }
 }
 
 void loop() {
-  // put your main code here, to run repeatedly:
+  bool current_state;
+  for (size_t i = 0; i < NUM_KEYS; ++i) {
+    current_state = digitalRead(pin_array[i]);
+    if (current_state != states[i]) {
+      if (current_state == LOW) {
+        Gamepad.press(key_array[i]);
+      } else {
+        Gamepad.release(key_array[i]);
+      }
+      states[i] = current_state;
+    }
+  }
 }
\ No newline at end of file