diff --git a/keyboards/cipulot/ec_660c/config.h b/keyboards/cipulot/ec_660c/config.h
new file mode 100644
index 0000000000..9e883c40da
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/config.h
@@ -0,0 +1,66 @@
+/* Copyright 2023 Cipulot
+ *
+ * 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 3 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
+
+#define MATRIX_ROWS 5
+#define MATRIX_COLS 15
+
+#define MATRIX_ROW_PINS \
+ { B1, B10, B0, A1, A0 }
+
+#define AMUX_COUNT 2
+#define AMUX_MAX_COLS_COUNT 8
+
+#define AMUX_EN_PINS \
+ { B7, B6 }
+
+#define AMUX_SEL_PINS \
+ { B5, B4, B3 }
+
+#define AMUX_COL_CHANNELS_SIZES \
+ { 8, 7 }
+
+#define AMUX_0_COL_CHANNELS \
+ { 3, 0, 1, 2, 4, 6, 7, 5 }
+
+#define AMUX_1_COL_CHANNELS \
+ { 3, 0, 1, 2, 4, 6, 7 }
+
+#define AMUX_COL_CHANNELS AMUX_0_COL_CHANNELS, AMUX_1_COL_CHANNELS
+
+#define DISCHARGE_PIN A5
+#define ANALOG_PORT A4
+
+#define DEFAULT_ACTUATION_MODE 0
+#define DEFAULT_MODE_0_ACTUATION_LEVEL 550
+#define DEFAULT_MODE_0_RELEASE_LEVEL 500
+#define DEFAULT_MODE_1_INITIAL_DEADZONE_OFFSET DEFAULT_MODE_0_ACTUATION_LEVEL
+#define DEFAULT_MODE_1_ACTUATION_OFFSET 70
+#define DEFAULT_MODE_1_RELEASE_OFFSET 70
+#define DEFAULT_EXTREMUM 1023
+#define EXPECTED_NOISE_FLOOR 0
+#define NOISE_FLOOR_THRESHOLD 50
+#define BOTTOMING_CALIBRATION_THRESHOLD 100
+#define DEFAULT_NOISE_FLOOR_SAMPLING_COUNT 30
+#define DEFAULT_BOTTOMING_READING 1023
+#define DEFAULT_CALIBRATION_STARTER true
+
+#define DISCHARGE_TIME 10
+
+// #define DEBUG_MATRIX_SCAN_RATE
+
+#define EECONFIG_KB_DATA_SIZE 159
diff --git a/keyboards/cipulot/ec_660c/halconf.h b/keyboards/cipulot/ec_660c/halconf.h
new file mode 100644
index 0000000000..835d43b6a0
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/halconf.h
@@ -0,0 +1,21 @@
+/* Copyright 2023 Cipulot
+ *
+ * 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 3 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
+
+#define HAL_USE_ADC TRUE
+
+#include_next
diff --git a/keyboards/cipulot/ec_660c/info.json b/keyboards/cipulot/ec_660c/info.json
new file mode 100644
index 0000000000..32ac397b6b
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/info.json
@@ -0,0 +1,111 @@
+{
+ "manufacturer": "Cipulot",
+ "keyboard_name": "EC 660C",
+ "maintainer": "Cipulot",
+ "bootloader": "stm32-dfu",
+ "build": {
+ "lto": true
+ },
+ "diode_direction": "COL2ROW",
+ "features": {
+ "bootmagic": false,
+ "console": true,
+ "extrakey": true,
+ "mousekey": true,
+ "nkro": true
+ },
+ "indicators": {
+ "caps_lock": "B14",
+ "scroll_lock": "B15"
+ },
+ "processor": "STM32F401",
+ "qmk": {
+ "locking": {
+ "enabled": true,
+ "resync": true
+ }
+ },
+ "usb": {
+ "device_version": "0.0.1",
+ "pid": "0x6BA6",
+ "shared_endpoint": {
+ "keyboard": true
+ },
+ "vid": "0x6369"
+ },
+ "layouts": {
+ "LAYOUT": {
+ "layout": [
+ {"label": "0,0", "matrix": [0, 0], "x": 0, "y": 0},
+ {"label": "0,1", "matrix": [0, 1], "x": 1, "y": 0},
+ {"label": "0,2", "matrix": [0, 2], "x": 2, "y": 0},
+ {"label": "0,3", "matrix": [0, 3], "x": 3, "y": 0},
+ {"label": "0,4", "matrix": [0, 4], "x": 4, "y": 0},
+ {"label": "0,5", "matrix": [0, 5], "x": 5, "y": 0},
+ {"label": "0,6", "matrix": [0, 6], "x": 6, "y": 0},
+ {"label": "0,7", "matrix": [0, 7], "x": 7, "y": 0},
+ {"label": "0,8", "matrix": [0, 8], "x": 8, "y": 0},
+ {"label": "0,9", "matrix": [0, 9], "x": 9, "y": 0},
+ {"label": "0,10", "matrix": [0, 10], "x": 10, "y": 0},
+ {"label": "0,11", "matrix": [0, 11], "x": 11, "y": 0},
+ {"label": "0,12", "matrix": [0, 12], "x": 12, "y": 0},
+ {"label": "0,13", "matrix": [0, 13], "x": 13, "y": 0},
+ {"label": "0,14", "matrix": [0, 14], "x": 14, "y": 0},
+ {"label": "1,14", "matrix": [1, 14], "x": 15.5, "y": 0},
+ {"label": "1,0", "matrix": [1, 0], "x": 0, "y": 1, "w": 1.5},
+ {"label": "1,1", "matrix": [1, 1], "x": 1.5, "y": 1},
+ {"label": "1,2", "matrix": [1, 2], "x": 2.5, "y": 1},
+ {"label": "1,3", "matrix": [1, 3], "x": 3.5, "y": 1},
+ {"label": "1,4", "matrix": [1, 4], "x": 4.5, "y": 1},
+ {"label": "1,5", "matrix": [1, 5], "x": 5.5, "y": 1},
+ {"label": "1,6", "matrix": [1, 6], "x": 6.5, "y": 1},
+ {"label": "1,7", "matrix": [1, 7], "x": 7.5, "y": 1},
+ {"label": "1,8", "matrix": [1, 8], "x": 8.5, "y": 1},
+ {"label": "1,9", "matrix": [1, 9], "x": 9.5, "y": 1},
+ {"label": "1,10", "matrix": [1, 10], "x": 10.5, "y": 1},
+ {"label": "1,11", "matrix": [1, 11], "x": 11.5, "y": 1},
+ {"label": "1,12", "matrix": [1, 12], "x": 12.5, "y": 1},
+ {"label": "1,13", "matrix": [1, 13], "x": 13.5, "y": 1, "w": 1.5},
+ {"label": "2,14", "matrix": [2, 14], "x": 15.5, "y": 1},
+ {"label": "2,0", "matrix": [2, 0], "x": 0, "y": 2, "w": 1.75},
+ {"label": "2,1", "matrix": [2, 1], "x": 1.75, "y": 2},
+ {"label": "2,2", "matrix": [2, 2], "x": 2.75, "y": 2},
+ {"label": "2,3", "matrix": [2, 3], "x": 3.75, "y": 2},
+ {"label": "2,4", "matrix": [2, 4], "x": 4.75, "y": 2},
+ {"label": "2,5", "matrix": [2, 5], "x": 5.75, "y": 2},
+ {"label": "2,6", "matrix": [2, 6], "x": 6.75, "y": 2},
+ {"label": "2,7", "matrix": [2, 7], "x": 7.75, "y": 2},
+ {"label": "2,8", "matrix": [2, 8], "x": 8.75, "y": 2},
+ {"label": "2,9", "matrix": [2, 9], "x": 9.75, "y": 2},
+ {"label": "2,10", "matrix": [2, 10], "x": 10.75, "y": 2},
+ {"label": "2,11", "matrix": [2, 11], "x": 11.75, "y": 2},
+ {"label": "2,12", "matrix": [2, 12], "x": 12.75, "y": 2},
+ {"label": "2,13", "matrix": [2, 13], "x": 13.75, "y": 2, "w": 1.25},
+ {"label": "3,0", "matrix": [3, 0], "x": 0, "y": 3, "w": 1.25},
+ {"label": "3,1", "matrix": [3, 1], "x": 1.25, "y": 3},
+ {"label": "3,2", "matrix": [3, 2], "x": 2.25, "y": 3},
+ {"label": "3,3", "matrix": [3, 3], "x": 3.25, "y": 3},
+ {"label": "3,4", "matrix": [3, 4], "x": 4.25, "y": 3},
+ {"label": "3,5", "matrix": [3, 5], "x": 5.25, "y": 3},
+ {"label": "3,6", "matrix": [3, 6], "x": 6.25, "y": 3},
+ {"label": "3,7", "matrix": [3, 7], "x": 7.25, "y": 3},
+ {"label": "3,8", "matrix": [3, 8], "x": 8.25, "y": 3},
+ {"label": "3,9", "matrix": [3, 9], "x": 9.25, "y": 3},
+ {"label": "3,10", "matrix": [3, 10], "x": 10.25, "y": 3},
+ {"label": "3,11", "matrix": [3, 11], "x": 11.25, "y": 3},
+ {"label": "3,12", "matrix": [3, 12], "x": 12.25, "y": 3, "w": 2.25},
+ {"label": "3,13", "matrix": [3, 13], "x": 14.5, "y": 3},
+ {"label": "4,0", "matrix": [4, 0], "x": 0, "y": 4, "w": 1.25},
+ {"label": "4,1", "matrix": [4, 1], "x": 1.25, "y": 4, "w": 1.25},
+ {"label": "4,2", "matrix": [4, 2], "x": 2.5, "y": 4, "w": 1.25},
+ {"label": "4,6", "matrix": [4, 6], "x": 3.75, "y": 4, "w": 6},
+ {"label": "4,9", "matrix": [4, 9], "x": 9.75, "y": 4, "w": 1.25},
+ {"label": "4,10", "matrix": [4, 10], "x": 11, "y": 4, "w": 1.25},
+ {"label": "4,11", "matrix": [4, 11], "x": 12.25, "y": 4, "w": 1.25},
+ {"label": "4,12", "matrix": [4, 12], "x": 13.5, "y": 4},
+ {"label": "4,13", "matrix": [4, 13], "x": 14.5, "y": 4},
+ {"label": "4,14", "matrix": [4, 14], "x": 15.5, "y": 4}
+ ]
+ }
+ }
+}
diff --git a/keyboards/cipulot/ec_660c/keymaps/default/keymap.c b/keyboards/cipulot/ec_660c/keymaps/default/keymap.c
new file mode 100644
index 0000000000..5d82bdc3ab
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/keymaps/default/keymap.c
@@ -0,0 +1,43 @@
+/* Copyright 2023 Cipulot
+ *
+ * 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 3 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] = {
+ // clang-format off
+ [0] = LAYOUT(
+ KC_ESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, KC_BSPC, KC_BSPC, KC_INS,
+ KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_BSLS, KC_DEL,
+ KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,
+ KC_LSFT, KC_BSLS, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_UP,
+ KC_LCTL, KC_LGUI, KC_LALT, KC_SPC, KC_RALT, KC_RCTL, MO(1), KC_LEFT, KC_DOWN, KC_RGHT
+ ),
+ [1] = LAYOUT(
+ KC_GRV, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, _______, _______, _______,
+ KC_CAPS, _______, _______, _______, _______, _______, _______, _______, KC_PSCR, KC_SCRL, KC_PAUS, _______, _______, _______, _______,
+ _______, KC_VOLD, KC_VOLU, KC_MUTE, _______, _______, _______, _______, KC_HOME, KC_PGUP, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_END, KC_PGDN, _______, _______, _______,
+ _______, _______, _______, _______, _______, MO(2), _______, _______, _______, _______
+ ),
+ [2] = LAYOUT(
+ QK_BOOT, NK_TOGG, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+ )
+ // clang-format on
+};
diff --git a/keyboards/cipulot/ec_660c/keymaps/via/keymap.c b/keyboards/cipulot/ec_660c/keymaps/via/keymap.c
new file mode 100644
index 0000000000..5d82bdc3ab
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/keymaps/via/keymap.c
@@ -0,0 +1,43 @@
+/* Copyright 2023 Cipulot
+ *
+ * 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 3 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] = {
+ // clang-format off
+ [0] = LAYOUT(
+ KC_ESC, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_MINS, KC_EQL, KC_BSPC, KC_BSPC, KC_INS,
+ KC_TAB, KC_Q, KC_W, KC_E, KC_R, KC_T, KC_Y, KC_U, KC_I, KC_O, KC_P, KC_LBRC, KC_RBRC, KC_BSLS, KC_DEL,
+ KC_CAPS, KC_A, KC_S, KC_D, KC_F, KC_G, KC_H, KC_J, KC_K, KC_L, KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT,
+ KC_LSFT, KC_BSLS, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_UP,
+ KC_LCTL, KC_LGUI, KC_LALT, KC_SPC, KC_RALT, KC_RCTL, MO(1), KC_LEFT, KC_DOWN, KC_RGHT
+ ),
+ [1] = LAYOUT(
+ KC_GRV, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_F11, KC_F12, _______, _______, _______,
+ KC_CAPS, _______, _______, _______, _______, _______, _______, _______, KC_PSCR, KC_SCRL, KC_PAUS, _______, _______, _______, _______,
+ _______, KC_VOLD, KC_VOLU, KC_MUTE, _______, _______, _______, _______, KC_HOME, KC_PGUP, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_END, KC_PGDN, _______, _______, _______,
+ _______, _______, _______, _______, _______, MO(2), _______, _______, _______, _______
+ ),
+ [2] = LAYOUT(
+ QK_BOOT, NK_TOGG, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+ _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
+ )
+ // clang-format on
+};
diff --git a/keyboards/cipulot/ec_660c/keymaps/via/rules.mk b/keyboards/cipulot/ec_660c/keymaps/via/rules.mk
new file mode 100644
index 0000000000..1e5b99807c
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/keymaps/via/rules.mk
@@ -0,0 +1 @@
+VIA_ENABLE = yes
diff --git a/keyboards/cipulot/ec_660c/mcuconf.h b/keyboards/cipulot/ec_660c/mcuconf.h
new file mode 100644
index 0000000000..fa3c955e0d
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/mcuconf.h
@@ -0,0 +1,22 @@
+/* Copyright 2023 Cipulot
+ *
+ * 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 3 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_next
+
+#undef STM32_ADC_USE_ADC1
+#define STM32_ADC_USE_ADC1 TRUE
diff --git a/keyboards/cipulot/ec_660c/post_rules.mk b/keyboards/cipulot/ec_660c/post_rules.mk
new file mode 100644
index 0000000000..d726a112a8
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/post_rules.mk
@@ -0,0 +1,3 @@
+ifeq ($(strip $(VIA_ENABLE)), yes)
+ SRC += keyboards/cipulot/common/via_ec.c
+endif
diff --git a/keyboards/cipulot/ec_660c/readme.md b/keyboards/cipulot/ec_660c/readme.md
new file mode 100644
index 0000000000..c01bb3252e
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/readme.md
@@ -0,0 +1,26 @@
+# EC660C
+
+![EC660C PCB](https://i.imgur.com/HfTvrkph.jpg)
+
+Replacement PCB for the Leopold FC660C.
+
+* Keyboard Maintainer: [cipulot](https://github.com/cipulot)
+* Hardware Supported: EC660C PCB
+* Hardware Availability: TBD
+
+Make example for this keyboard (after setting up your build environment):
+
+ make cipulot/ec_660c:default
+
+Flashing example for this keyboard:
+
+ make cipulot/ec_660c:default:flash
+
+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).
+
+## Bootloader
+
+Enter the bootloader in 2 ways:
+
+* **Physical reset**: Long short the exposed pads on the top of the PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
diff --git a/keyboards/cipulot/ec_660c/rules.mk b/keyboards/cipulot/ec_660c/rules.mk
new file mode 100644
index 0000000000..ce525670a6
--- /dev/null
+++ b/keyboards/cipulot/ec_660c/rules.mk
@@ -0,0 +1,5 @@
+CUSTOM_MATRIX = lite
+ANALOG_DRIVER_REQUIRED = yes
+VPATH += keyboards/cipulot/common
+SRC += matrix.c ec_board.c ec_switch_matrix.c
+OPT = 3