diff --git a/keyboards/ymdk/ymd40/v2/config.h b/keyboards/ymdk/ymd40/v2/config.h
new file mode 100644
index 000000000..926333f4e
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/config.h
@@ -0,0 +1,71 @@
+/* Copyright 2021 James Young (@noroadsleft)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID 0x594D // "YM"
+#define PRODUCT_ID 0x4440 // "D" + 40
+#define DEVICE_VER 0x0001
+#define MANUFACTURER YMDK
+#define PRODUCT YMD40 v2
+
+/* key matrix size */
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 12
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ * ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+#define MATRIX_ROW_PINS { D0, B3, B2, B1 }
+#define MATRIX_COL_PINS { F1, F0, B0, C7, F4, F5, F6, F7, D4, D6, B4, D7 }
+
+#define DIODE_DIRECTION COL2ROW
+
+#define BACKLIGHT_PIN B6
+#define BACKLIGHT_BREATHING
+#define BACKLIGHT_LEVELS 3
+
+#if defined(RGBLIGHT_ENABLE)
+ #define RGB_DI_PIN E2
+ #define RGBLED_NUM 8
+ #define RGBLIGHT_HUE_STEP 8
+ #define RGBLIGHT_SAT_STEP 8
+ #define RGBLIGHT_VAL_STEP 8
+ #define RGBLIGHT_LIMIT_VAL 150 /* The maximum brightness level */
+ #define RGBLIGHT_SLEEP /* If defined, the RGB lighting will be switched off when the host goes to sleep */
+/*== all animations enable ==*/
+ #define RGBLIGHT_ANIMATIONS
+// /*== or choose animations ==*/
+// #define RGBLIGHT_EFFECT_BREATHING
+// #define RGBLIGHT_EFFECT_RAINBOW_MOOD
+// #define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+// #define RGBLIGHT_EFFECT_SNAKE
+// #define RGBLIGHT_EFFECT_KNIGHT
+// #define RGBLIGHT_EFFECT_CHRISTMAS
+// #define RGBLIGHT_EFFECT_STATIC_GRADIENT
+// #define RGBLIGHT_EFFECT_RGB_TEST
+// #define RGBLIGHT_EFFECT_ALTERNATING
+#endif
diff --git a/keyboards/ymdk/ymd40/v2/info.json b/keyboards/ymdk/ymd40/v2/info.json
new file mode 100644
index 000000000..7bb677e20
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/info.json
@@ -0,0 +1,64 @@
+{
+ "keyboard_name": "ymd40v2",
+ "url": "",
+ "maintainer": "qmk",
+ "width": 12,
+ "height": 4,
+ "layouts": {
+ "LAYOUT_ortho_4x12": {
+ "layout": [
+ {"label":"K00 (D0,F1)", "x":0, "y":0},
+ {"label":"K01 (D0,F0)", "x":1, "y":0},
+ {"label":"K02 (D0,B0)", "x":2, "y":0},
+ {"label":"K03 (D0,C7)", "x":3, "y":0},
+ {"label":"K04 (D0,F4)", "x":4, "y":0},
+ {"label":"K05 (D0,F5)", "x":5, "y":0},
+ {"label":"K06 (D0,F6)", "x":6, "y":0},
+ {"label":"K07 (D0,F7)", "x":7, "y":0},
+ {"label":"K08 (D0,D4)", "x":8, "y":0},
+ {"label":"K09 (D0,D6)", "x":9, "y":0},
+ {"label":"K0A (D0,B4)", "x":10, "y":0},
+ {"label":"K0B (D0,D7)", "x":11, "y":0},
+
+ {"label":"K10 (B3,F1)", "x":0, "y":1},
+ {"label":"K11 (B3,F0)", "x":1, "y":1},
+ {"label":"K12 (B3,B0)", "x":2, "y":1},
+ {"label":"K13 (B3,C7)", "x":3, "y":1},
+ {"label":"K14 (B3,F4)", "x":4, "y":1},
+ {"label":"K15 (B3,F5)", "x":5, "y":1},
+ {"label":"K16 (B3,F6)", "x":6, "y":1},
+ {"label":"K17 (B3,F7)", "x":7, "y":1},
+ {"label":"K18 (B3,D4)", "x":8, "y":1},
+ {"label":"K19 (B3,D6)", "x":9, "y":1},
+ {"label":"K1A (B3,B4)", "x":10, "y":1},
+ {"label":"K1B (B3,D7)", "x":11, "y":1},
+
+ {"label":"K20 (B2,F1)", "x":0, "y":2},
+ {"label":"K21 (B2,F0)", "x":1, "y":2},
+ {"label":"K22 (B2,B0)", "x":2, "y":2},
+ {"label":"K23 (B2,C7)", "x":3, "y":2},
+ {"label":"K24 (B2,F4)", "x":4, "y":2},
+ {"label":"K25 (B2,F5)", "x":5, "y":2},
+ {"label":"K26 (B2,F6)", "x":6, "y":2},
+ {"label":"K27 (B2,F7)", "x":7, "y":2},
+ {"label":"K28 (B2,D4)", "x":8, "y":2},
+ {"label":"K29 (B2,D6)", "x":9, "y":2},
+ {"label":"K2A (B2,B4)", "x":10, "y":2},
+ {"label":"K2B (B2,D7)", "x":11, "y":2},
+
+ {"label":"K30 (B1,F1)", "x":0, "y":3},
+ {"label":"K31 (B1,F0)", "x":1, "y":3},
+ {"label":"K32 (B1,B0)", "x":2, "y":3},
+ {"label":"K33 (B1,C7)", "x":3, "y":3},
+ {"label":"K34 (B1,F4)", "x":4, "y":3},
+ {"label":"K35 (B1,F5)", "x":5, "y":3},
+ {"label":"K36 (B1,F6)", "x":6, "y":3},
+ {"label":"K37 (B1,F7)", "x":7, "y":3},
+ {"label":"K38 (B1,D4)", "x":8, "y":3},
+ {"label":"K39 (B1,D6)", "x":9, "y":3},
+ {"label":"K3A (B1,B4)", "x":10, "y":3},
+ {"label":"K3B (B1,D7)", "x":11, "y":3}
+ ]
+ }
+ }
+}
diff --git a/keyboards/ymdk/ymd40/v2/keymaps/default/keymap.c b/keyboards/ymdk/ymd40/v2/keymaps/default/keymap.c
new file mode 100644
index 000000000..10d9385cf
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/keymaps/default/keymap.c
@@ -0,0 +1,55 @@
+/* Copyright 2021 James Young (@noroadsleft)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#include QMK_KEYBOARD_H
+
+enum layer_names {
+ _QWERTY,
+ _LOWER,
+ _RAISE,
+ _ADJUST
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ [_QWERTY] = LAYOUT_ortho_4x12(
+ KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSPC,
+ KC_ESC, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT,
+ KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_ENT,
+ KC_CAPS, KC_LCTL, KC_LALT, KC_LGUI, MO(1), KC_SPC, KC_SPC, MO(2), KC_UP, KC_LEFT, KC_DOWN, KC_RGHT
+ ),
+ [_LOWER] = LAYOUT_ortho_4x12(
+ KC_TILD, KC_EXLM, KC_AT, KC_HASH, KC_DLR, KC_PERC, KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, KC_BSPC,
+ KC_DEL, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_UNDS, KC_PLUS, KC_LCBR, KC_RCBR, KC_PIPE,
+ _______, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, S(KC_NUHS), S(KC_NUBS), KC_HOME, KC_END, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY
+ ),
+ [_RAISE] = LAYOUT_ortho_4x12(
+ KC_GRV, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_BSPC,
+ KC_DEL, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_MINS, KC_EQL, KC_LBRC, KC_RBRC, KC_BSLS,
+ _______, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, KC_NUHS, KC_NUBS, KC_PGUP, KC_PGDN, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, KC_MNXT, KC_VOLD, KC_VOLU, KC_MPLY
+ ),
+ [_ADJUST] = LAYOUT_ortho_4x12(
+ RESET, RGB_TOG, RGB_HUI, RGB_SAI, RGB_VAI, _______, _______, _______, _______, _______, _______, DEBUG,
+ _______, RGB_MOD, RGB_HUD, RGB_SAD, RGB_VAD, AG_NORM, AG_SWAP, _______, _______, _______, _______, _______,
+ _______, BL_TOGG, BL_DEC, BL_INC, BL_BRTG, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+ )
+};
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+ return update_tri_layer_state(state, _LOWER, _RAISE, _ADJUST);
+}
diff --git a/keyboards/ymdk/ymd40/v2/keymaps/default/readme.md b/keyboards/ymdk/ymd40/v2/keymaps/default/readme.md
new file mode 100644
index 000000000..952866354
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/keymaps/default/readme.md
@@ -0,0 +1 @@
+# The default keymap for YMD40 v2
diff --git a/keyboards/ymdk/ymd40/v2/keymaps/factory/keymap.c b/keyboards/ymdk/ymd40/v2/keymaps/factory/keymap.c
new file mode 100644
index 000000000..3c7de8bc6
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/keymaps/factory/keymap.c
@@ -0,0 +1,32 @@
+/* Copyright 2021 James Young (@noroadsleft)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ [0] = LAYOUT_ortho_4x12(
+ KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_BSPC,
+ KC_ESC, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT,
+ KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_ENT,
+ KC_CAPS, KC_LCTL, KC_LALT, KC_LGUI, KC_DEL, KC_SPC, KC_SPC, RGB_MOD, KC_UP, KC_LEFT, KC_DOWN, KC_RGHT
+ ),
+ [1] = LAYOUT_ortho_4x12(
+ RESET, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+ ),
+};
diff --git a/keyboards/ymdk/ymd40/v2/keymaps/factory/readme.md b/keyboards/ymdk/ymd40/v2/keymaps/factory/readme.md
new file mode 100644
index 000000000..923396165
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/keymaps/factory/readme.md
@@ -0,0 +1,3 @@
+# The factory keymap for YMD40 v2
+
+This is the keymap assigned by the KBFirmware-format JSON file distributed by the vendor. This is included mainly for reference; if you wish to create your own keymap, the `default` keymap is a better starting point.
diff --git a/keyboards/ymdk/ymd40/v2/readme.md b/keyboards/ymdk/ymd40/v2/readme.md
new file mode 100644
index 000000000..153853c9f
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/readme.md
@@ -0,0 +1,22 @@
+# YMD40 v2
+
+\
+[PCB photo](https://raw.githubusercontent.com/noroadsleft/qmk_images/master/keyboards/ymdk/ymd40/v2/ymdk_ymd40_v2_pcb.jpg)
+
+A 40% ortholinear keyboard with in-switch LED support, underglow, and USB Type C.
+
+* Keyboard Maintainer: [The QMK Community](https://github.com/qmk)
+* Hardware Supported: YMD40v2 PCB (ATmega32U4)
+* Hardware Availability: [AliExpress](https://www.aliexpress.com/i/32821953148.html), [ymdkey.com](https://ymdkey.com/collections/40-mini-diy/products/ymd40-v2-diy-kit-qmk-type-c-pcb-cnc-case-plate-for-40-mini-cute-mechanical-keyboard-similar-to-planck-layout)
+
+Make example for this keyboard (after setting up your build environment):
+
+ make ymdk/ymd40/v2:default
+
+Flashing example for this keyboard:
+
+ make ymdk/ymd40/v2:default:flash
+
+To reset the board into bootloader mode, hold the key at the top left of the keyboard while connecting the USB cable (also erases persistent settings).
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/ymdk/ymd40/v2/rules.mk b/keyboards/ymdk/ymd40/v2/rules.mk
new file mode 100644
index 000000000..7c7c443c9
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/rules.mk
@@ -0,0 +1,28 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+# change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = yes # Mouse keys
+EXTRAKEY_ENABLE = yes # Audio control and System control
+CONSOLE_ENABLE = no # Console for debug
+COMMAND_ENABLE = no # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no # USB Nkey Rollover
+BACKLIGHT_ENABLE = yes # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no # Enable Bluetooth
+AUDIO_ENABLE = no # Audio output
+
+KEY_LOCK_ENABLE = no # Enable KC_LOCK support
+
+AUDIO_SUPPORTED = no
+
+LAYOUTS = ortho_4x12
diff --git a/keyboards/ymdk/ymd40/v2/v2.c b/keyboards/ymdk/ymd40/v2/v2.c
new file mode 100644
index 000000000..54450ccd1
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/v2.c
@@ -0,0 +1,17 @@
+/* Copyright 2021 James Young (@noroadsleft)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#include "v2.h"
diff --git a/keyboards/ymdk/ymd40/v2/v2.h b/keyboards/ymdk/ymd40/v2/v2.h
new file mode 100644
index 000000000..6d524e073
--- /dev/null
+++ b/keyboards/ymdk/ymd40/v2/v2.h
@@ -0,0 +1,31 @@
+/* Copyright 2021 James Young (@noroadsleft)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+#define LAYOUT_ortho_4x12( \
+ K00, K01, K02, K03, K04, K05, K06, K07, K08, K09, K0A, K0B, \
+ K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K1A, K1B, \
+ K20, K21, K22, K23, K24, K25, K26, K27, K28, K29, K2A, K2B, \
+ K30, K31, K32, K33, K34, K35, K36, K37, K38, K39, K3A, K3B \
+) { \
+ { K00, K01, K02, K03, K04, K05, K06, K07, K08, K09, K0A, K0B }, \
+ { K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K1A, K1B }, \
+ { K20, K21, K22, K23, K24, K25, K26, K27, K28, K29, K2A, K2B }, \
+ { K30, K31, K32, K33, K34, K35, K36, K37, K38, K39, K3A, K3B }, \
+}