diff --git a/keyboards/zfrontier/big_switch/big_switch.c b/keyboards/zfrontier/big_switch/big_switch.c
new file mode 100644
index 000000000000..53c3e34e7f53
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/big_switch.c
@@ -0,0 +1,17 @@
+/* Copyright 2020 zFrontier
+ *
+ * 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 "big_switch.h"
diff --git a/keyboards/zfrontier/big_switch/big_switch.h b/keyboards/zfrontier/big_switch/big_switch.h
new file mode 100644
index 000000000000..d12184932d60
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/big_switch.h
@@ -0,0 +1,34 @@
+/* Copyright 2020 zFrontier
+ *
+ * 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"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT( \
+ K00 \
+) \
+{ \
+ { K00 } \
+}
diff --git a/keyboards/zfrontier/big_switch/config.h b/keyboards/zfrontier/big_switch/config.h
new file mode 100644
index 000000000000..6b4111c054e9
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/config.h
@@ -0,0 +1,54 @@
+/*
+Copyright 2020 zFrontier
+
+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 0xFEED
+#define PRODUCT_ID 0x0A01
+#define DEVICE_VER 0x0005
+#define MANUFACTURER zFrontier
+#define PRODUCT Red Comet Big Switch
+#define DESCRIPTION Big Switch
+
+/* key matrix size */
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Keyboard Matrix Assignments */
+#define MATRIX_ROW_PINS { F0 }
+#define MATRIX_COL_PINS { F1 }
+#define UNUSED_PINS
+
+/* COL2ROW, ROW2COL*/
+#define DIODE_DIRECTION COL2ROW
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* RGB light config */
+#define RGB_DI_PIN B6
+#define RGBLED_NUM 4
+#define RGBLIGHT_VAL_STEP 17
+#define RGBLIGHT_ANIMATIONS
+#define RGBLIGHT_EFFECT_BREATHE_CENTER 2.0
+#define RGBLIGHT_EFFECT_BREATHE_MAX 255
+
+/* long tapping config */
+#define TAPPING_TERM 500
diff --git a/keyboards/zfrontier/big_switch/keymaps/default/keymap.c b/keyboards/zfrontier/big_switch/keymaps/default/keymap.c
new file mode 100644
index 000000000000..a30690a39270
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/keymaps/default/keymap.c
@@ -0,0 +1,31 @@
+/* Copyright 2020 zFrontier
+ *
+ * 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(KC_ENTER),
+};
+
+
+
+void keyboard_post_init_user(void) {
+ rgblight_enable_noeeprom();
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_BREATHING);
+ rgblight_sethsv_noeeprom(0,0,128);
+}
+
diff --git a/keyboards/zfrontier/big_switch/keymaps/default/readme.md b/keyboards/zfrontier/big_switch/keymaps/default/readme.md
new file mode 100644
index 000000000000..fea7a92a5761
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/keymaps/default/readme.md
@@ -0,0 +1 @@
+# The default keymap for big_switch
diff --git a/keyboards/zfrontier/big_switch/keymaps/longtap/keymap.c b/keyboards/zfrontier/big_switch/keymaps/longtap/keymap.c
new file mode 100644
index 000000000000..a475421a3ad9
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/keymaps/longtap/keymap.c
@@ -0,0 +1,118 @@
+/* Copyright 2020 zFrontier
+ *
+ * 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
+#include
+
+
+enum {
+ TD_ENTER = 0,
+};
+
+
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ LAYOUT( TD(TD_ENTER) ),
+};
+
+
+
+void keyboard_post_init_user(void) {
+ print("zFrontier S01.6 boot...\n");
+ rgblight_enable_noeeprom();
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_BREATHING);
+ rgblight_sethsv_noeeprom(0,0,128);
+}
+
+
+void zf_switch_rgb_mode(void) {
+ switch (rgblight_get_mode() ) {
+ case RGBLIGHT_MODE_BREATHING:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_RAINBOW_MOOD);
+ break;
+ case RGBLIGHT_MODE_RAINBOW_MOOD:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_RAINBOW_SWIRL);
+ break;
+ case RGBLIGHT_MODE_RAINBOW_SWIRL:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_SNAKE);
+ break;
+ case RGBLIGHT_MODE_SNAKE:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_KNIGHT);
+ break;
+ case RGBLIGHT_MODE_KNIGHT:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_CHRISTMAS);
+ break;
+ case RGBLIGHT_MODE_CHRISTMAS:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_STATIC_GRADIENT);
+ break;
+ case RGBLIGHT_MODE_STATIC_GRADIENT:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_RGB_TEST);
+ break;
+ case RGBLIGHT_MODE_RGB_TEST:
+ default:
+ rgblight_mode_noeeprom(RGBLIGHT_MODE_BREATHING);
+ break;
+ }
+}
+
+void zf_send_random_string(void) {
+ uint8_t tmpu8 = (timer_read() & 0x7);
+ switch (tmpu8) {
+ case 0:
+ case 1:
+ SEND_STRING("Sazabi, launching!");
+ break;
+ case 2:
+ case 3:
+ SEND_STRING("I, Char Aznable, will purge them, Amuro!");
+ break;
+ case 4:
+ case 5:
+ SEND_STRING("Their souls are weighted down by gravity!");
+ break;
+ case 6:
+ SEND_STRING("Go, Axis! With my unpleasant memories!");
+ break;
+ case 7:
+ SEND_STRING("Hello from zFrontier!");
+ break;
+ }
+
+ tap_code(KC_ENT);
+}
+
+void dance_finished(qk_tap_dance_state_t *state, void *user_data) {
+ switch (state->count) {
+ case 1:
+ register_code(KC_ENTER);
+ break;
+ case 2:
+ zf_switch_rgb_mode();
+ break;
+ default:
+ zf_send_random_string();
+ break;
+ }
+}
+
+void dance_reset(qk_tap_dance_state_t *state, void *user_data) {
+ if (state->count == 1) {
+ unregister_code(KC_ENTER);
+ }
+}
+
+qk_tap_dance_action_t tap_dance_actions[] = {
+ [TD_ENTER] = ACTION_TAP_DANCE_FN_ADVANCED (NULL, dance_finished, dance_reset)
+};
diff --git a/keyboards/zfrontier/big_switch/keymaps/longtap/readme.md b/keyboards/zfrontier/big_switch/keymaps/longtap/readme.md
new file mode 100644
index 000000000000..a94e5c32cb2b
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/keymaps/longtap/readme.md
@@ -0,0 +1,4 @@
+# The longtap keymap for big_switch, the single switch keyboard,
+- tap once : send ENTER
+- tap twice : change RGB backlight mode
+- tap three times : send a pesudo-random string
diff --git a/keyboards/zfrontier/big_switch/keymaps/longtap/rules.mk b/keyboards/zfrontier/big_switch/keymaps/longtap/rules.mk
new file mode 100644
index 000000000000..e5ddcae8d927
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/keymaps/longtap/rules.mk
@@ -0,0 +1 @@
+TAP_DANCE_ENABLE = yes
diff --git a/keyboards/zfrontier/big_switch/readme.md b/keyboards/zfrontier/big_switch/readme.md
new file mode 100644
index 000000000000..d0009cfecdca
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/readme.md
@@ -0,0 +1,15 @@
+# zFrontier Big Switch
+
+![big_switch](https://img.zfrontier.com/cover/20180808/FiuL_XSz1WCP4tm2Q25I-JLtheK3)
+
+A keyboard designed by zFrontier with RGB backlight and only one switch.
+
+* Keyboard Maintainer: [carlxia](https://github.com/carlxia)
+* Hardware Supported: zFrontier Big Switch
+* Hardware Availability: [zFrontier page](https://en.zfrontier.com/products/redcomet-bigswitch-combo)
+
+Make example for this keyboard (after setting up your build environment):
+
+ make zfrontier/big_switch:longtap
+
+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/zfrontier/big_switch/rules.mk b/keyboards/zfrontier/big_switch/rules.mk
new file mode 100644
index 000000000000..17be8a47aa3f
--- /dev/null
+++ b/keyboards/zfrontier/big_switch/rules.mk
@@ -0,0 +1,33 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+# Teensy halfkay
+# Pro Micro caterina
+# Atmel DFU atmel-dfu
+# LUFA DFU lufa-dfu
+# QMK DFU qmk-dfu
+# ATmega32A bootloadHID
+# ATmega328P USBasp
+BOOTLOADER = atmel-dfu
+
+# Build Options
+# change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no # Mouse keys
+EXTRAKEY_ENABLE = no # Audio control and System control
+CONSOLE_ENABLE = yes # 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 = no # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = yes # Enable keyboard RGB underglow
+MIDI_ENABLE = no # MIDI support
+BLUETOOTH_ENABLE = no # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = no # Audio output on port C6
+FAUXCLICKY_ENABLE = no # Use buzzer to emulate clicky switches
+HD44780_ENABLE = no # Enable support for HD44780 based LCDs
+TAP_DANCE_ENABLE = no