[Keyboard] Add SENSE75 firmware (#18442)

16 files changed, 782 insertions, 0 deletions

diff --git a/keyboards/drop/sense75/board.h b/keyboards/drop/sense75/board.h
new file mode 100644
index 0000000000..fc227f69b1
--- /dev/null
+++ b/keyboards/drop/sense75/board.h
@@ -0,0 +1,8 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include_next "board.h"
+
+#undef STM32_HSECLK
+#define STM32_HSECLK 16000000U
diff --git a/keyboards/drop/sense75/config.h b/keyboards/drop/sense75/config.h
new file mode 100644
index 0000000000..b0196d0c44
--- /dev/null
+++ b/keyboards/drop/sense75/config.h
@@ -0,0 +1,67 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define I2C1_SCL_PIN B8
+#define I2C1_SDA_PIN B9
+
+#define EXTERNAL_EEPROM_I2C_BASE_ADDRESS 0b10101000
+#define EXTERNAL_EEPROM_WP_PIN B7
+#define EEPROM_I2C_24LC256
+
+#ifdef RGB_MATRIX_ENABLE
+#    define DRIVER_ADDR_1 0b1010000
+#    define DRIVER_ADDR_2 0b1011111
+#    define DRIVER_COUNT 2
+#    define DRIVER_LED_TOTAL (58 + 53)
+#    define ISSI_PWM_FREQUENCY 0b010 // 26k
+
+#    define RGB_DISABLE_TIMEOUT 0
+#    define RGB_DISABLE_WHEN_USB_SUSPENDED
+#    define RGB_MATRIX_STARTUP_MODE RGB_MATRIX_CYCLE_LEFT_RIGHT
+#    define RGB_MATRIX_KEYPRESSES
+#    define RGB_MATRIX_FRAMEBUFFER_EFFECTS
+#    define ENABLE_RGB_MATRIX_ALPHAS_MODS
+#    define ENABLE_RGB_MATRIX_GRADIENT_UP_DOWN
+#    define ENABLE_RGB_MATRIX_GRADIENT_LEFT_RIGHT
+#    define ENABLE_RGB_MATRIX_BREATHING
+#    define ENABLE_RGB_MATRIX_BAND_SAT
+#    define ENABLE_RGB_MATRIX_BAND_VAL
+#    define ENABLE_RGB_MATRIX_BAND_PINWHEEL_SAT
+#    define ENABLE_RGB_MATRIX_BAND_PINWHEEL_VAL
+#    define ENABLE_RGB_MATRIX_BAND_SPIRAL_SAT
+#    define ENABLE_RGB_MATRIX_BAND_SPIRAL_VAL
+#    define ENABLE_RGB_MATRIX_CYCLE_ALL
+#    define ENABLE_RGB_MATRIX_CYCLE_LEFT_RIGHT
+#    define ENABLE_RGB_MATRIX_CYCLE_UP_DOWN
+#    define ENABLE_RGB_MATRIX_RAINBOW_MOVING_CHEVRON
+#    define ENABLE_RGB_MATRIX_CYCLE_OUT_IN
+#    define ENABLE_RGB_MATRIX_CYCLE_OUT_IN_DUAL
+#    define ENABLE_RGB_MATRIX_CYCLE_PINWHEEL
+#    define ENABLE_RGB_MATRIX_CYCLE_SPIRAL
+#    define ENABLE_RGB_MATRIX_DUAL_BEACON
+#    define ENABLE_RGB_MATRIX_RAINBOW_BEACON
+#    define ENABLE_RGB_MATRIX_RAINBOW_PINWHEELS
+#    define ENABLE_RGB_MATRIX_RAINDROPS
+#    define ENABLE_RGB_MATRIX_JELLYBEAN_RAINDROPS
+#    define ENABLE_RGB_MATRIX_HUE_BREATHING
+#    define ENABLE_RGB_MATRIX_PIXEL_FRACTAL
+#    define ENABLE_RGB_MATRIX_PIXEL_FLOW
+#    define ENABLE_RGB_MATRIX_PIXEL_RAIN
+#    define ENABLE_RGB_MATRIX_HUE_PENDULUM
+#    define ENABLE_RGB_MATRIX_HUE_WAVE
+#    define ENABLE_RGB_MATRIX_TYPING_HEATMAP
+#    define ENABLE_RGB_MATRIX_DIGITAL_RAIN
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_SIMPLE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_WIDE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTIWIDE
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_CROSS
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTICROSS
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_NEXUS
+#    define ENABLE_RGB_MATRIX_SOLID_REACTIVE_MULTINEXUS
+#    define ENABLE_RGB_MATRIX_SPLASH
+#    define ENABLE_RGB_MATRIX_MULTISPLASH
+#    define ENABLE_RGB_MATRIX_SOLID_SPLASH
+#    define ENABLE_RGB_MATRIX_SOLID_MULTISPLASH
+#endif
diff --git a/keyboards/drop/sense75/halconf.h b/keyboards/drop/sense75/halconf.h
new file mode 100644
index 0000000000..b11f12ade7
--- /dev/null
+++ b/keyboards/drop/sense75/halconf.h
@@ -0,0 +1,7 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define HAL_USE_I2C TRUE
+
+#include_next <halconf.h>
diff --git a/keyboards/drop/sense75/info.json b/keyboards/drop/sense75/info.json
new file mode 100644
index 0000000000..8fd65c1bd7
--- /dev/null
+++ b/keyboards/drop/sense75/info.json
@@ -0,0 +1,235 @@
+{
+    "keyboard_name": "SENSE75", 
+    "manufacturer": "Drop Inc.",
+    "maintainer": "zvecr",
+    "processor": "STM32F303",
+    "bootloader": "stm32-dfu",
+    "diode_direction": "COL2ROW",
+    "matrix_pins": {
+        "cols": ["C15", "C14", "C13", "C12", "C11", "C10", "C9", "C8", "C7", "C6", "C5", "C4", "C3", "C2", "C1"],
+        "rows": ["B15", "B14", "B13", "B12", "B11", "B10"]
+    },
+    "usb": {
+        "vid": "0x359B",
+        "pid": "0x0001",
+        "device_version": "1.0.0"
+    },
+    "features": {
+        "rgb_matrix": true,
+        "encoder": true,
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                { "matrix": [0,  0], "label":"Esc", "x":0, "y":0},
+                { "matrix": [0,  1], "label":"F1", "x":1.25, "y":0},
+                { "matrix": [0,  2], "label":"F2", "x":2.25, "y":0},
+                { "matrix": [0,  3], "label":"F3", "x":3.25, "y":0},
+                { "matrix": [0,  4], "label":"F4", "x":4.25, "y":0},
+                { "matrix": [0,  5], "label":"F5", "x":5.5, "y":0},
+                { "matrix": [0,  6], "label":"F6", "x":6.5, "y":0}, 
+                { "matrix": [0,  7], "label":"F7", "x":7.5, "y":0},
+                { "matrix": [0,  8], "label":"F8", "x":8.5, "y":0},
+                { "matrix": [0,  9], "label":"F9", "x":9.75, "y":0},
+                { "matrix": [0, 10], "label":"F10", "x":10.75, "y":0},
+                { "matrix": [0, 11], "label":"F11", "x":11.75, "y":0},
+                { "matrix": [0, 12], "label":"F12", "x":12.75, "y":0},
+                { "matrix": [0, 13], "label":"PrtSc", "x":14, "y":0},
+                { "matrix": [0, 14], "label":"Mute", "x":15.25, "y":0},
+                { "matrix": [1,  0], "label":"~", "x":0, "y":1.25},
+                { "matrix": [1,  1], "label":"!", "x":1, "y":1.25},
+                { "matrix": [1,  2], "label":"@", "x":2, "y":1.25},
+                { "matrix": [1,  3], "label":"#", "x":3, "y":1.25},
+                { "matrix": [1,  4], "label":"$", "x":4, "y":1.25},
+                { "matrix": [1,  5], "label":"%", "x":5, "y":1.25},
+                { "matrix": [1,  6], "label":"^", "x":6, "y":1.25},
+                { "matrix": [1,  7], "label":"&", "x":7, "y":1.25},
+                { "matrix": [1,  8], "label":"*", "x":8, "y":1.25},
+                { "matrix": [1,  9], "label":"(", "x":9, "y":1.25},
+                { "matrix": [1, 10], "label":")", "x":10, "y":1.25},
+                { "matrix": [1, 11], "label":"_", "x":11, "y":1.25},
+                { "matrix": [1, 12], "label":"+", "x":12, "y":1.25},
+                { "matrix": [1, 13], "label":"Backspace", "x":13, "y":1.25, "w":2},
+                { "matrix": [1, 14], "label":"Del", "x":15.25, "y":1.25},
+                { "matrix": [2,  0], "label":"Tab", "x":0, "y":2.25, "w":1.5},
+                { "matrix": [2,  1], "label":"Q", "x":1.5, "y":2.25},
+                { "matrix": [2,  2], "label":"W", "x":2.5, "y":2.25},
+                { "matrix": [2,  3], "label":"E", "x":3.5, "y":2.25},
+                { "matrix": [2,  4], "label":"R", "x":4.5, "y":2.25},
+                { "matrix": [2,  5], "label":"T", "x":5.5, "y":2.25},
+                { "matrix": [2,  6], "label":"Y", "x":6.5, "y":2.25},
+                { "matrix": [2,  7], "label":"U", "x":7.5, "y":2.25},
+                { "matrix": [2,  8], "label":"I", "x":8.5, "y":2.25},
+                { "matrix": [2,  9], "label":"O", "x":9.5, "y":2.25},
+                { "matrix": [2, 10], "label":"P", "x":10.5, "y":2.25},
+                { "matrix": [2, 11], "label":"{", "x":11.5, "y":2.25},
+                { "matrix": [2, 12], "label":"}", "x":12.5, "y":2.25},
+                { "matrix": [2, 13], "label":"|", "x":13.5, "y":2.25, "w":1.5},
+                { "matrix": [2, 14], "label":"Page Up", "x":15.25, "y":2.25},
+                { "matrix": [3,  0], "label":"Caps Lock", "x":0, "y":3.25, "w":1.75},
+                { "matrix": [3,  1], "label":"A", "x":1.75, "y":3.25},
+                { "matrix": [3,  2], "label":"S", "x":2.75, "y":3.25},
+                { "matrix": [3,  3], "label":"D", "x":3.75, "y":3.25},
+                { "matrix": [3,  4], "label":"F", "x":4.75, "y":3.25},
+                { "matrix": [3,  5], "label":"G", "x":5.75, "y":3.25},
+                { "matrix": [3,  6], "label":"H", "x":6.75, "y":3.25},
+                { "matrix": [3,  7], "label":"J", "x":7.75, "y":3.25},
+                { "matrix": [3,  8], "label":"K", "x":8.75, "y":3.25},
+                { "matrix": [3,  9], "label":"L", "x":9.75, "y":3.25},
+                { "matrix": [3, 10], "label":":", "x":10.75, "y":3.25},
+                { "matrix": [3, 11], "label":"\"", "x":11.75, "y":3.25},
+                { "matrix": [3, 12], "label":"Enter", "x":12.75, "y":3.25, "w":2.25},
+                { "matrix": [3, 14], "label":"Page Down", "x":15.25, "y":3.25},
+                { "matrix": [4,  0], "label":"Shift", "x":0, "y":4.25, "w":2.25},
+                { "matrix": [4,  1], "label":"Z", "x":2.25, "y":4.25},
+                { "matrix": [4,  2], "label":"X", "x":3.25, "y":4.25},
+                { "matrix": [4,  3], "label":"C", "x":4.25, "y":4.25},
+                { "matrix": [4,  4], "label":"V", "x":5.25, "y":4.25},
+                { "matrix": [4,  5], "label":"B", "x":6.25, "y":4.25},
+                { "matrix": [4,  6], "label":"N", "x":7.25, "y":4.25},
+                { "matrix": [4,  7], "label":"M", "x":8.25, "y":4.25},
+                { "matrix": [4,  8], "label":"<", "x":9.25, "y":4.25},
+                { "matrix": [4,  9], "label":">", "x":10.25, "y":4.25},
+                { "matrix": [4, 10], "label":"?", "x":11.25, "y":4.25},
+                { "matrix": [4, 11], "label":"Shift", "x":12.25, "y":4.25, "w":1.75},
+                { "matrix": [4, 13], "label":"\u2191", "x":14.25, "y":4.5},
+                { "matrix": [5,  0], "label":"Ctrl", "x":0, "y":5.25, "w":1.25},
+                { "matrix": [5,  1], "label":"Win", "x":1.25, "y":5.25, "w":1.25},
+                { "matrix": [5,  2], "label":"Alt", "x":2.5, "y":5.25, "w":1.25},
+                { "matrix": [5,  5], "label":" ", "x":3.75, "y":5.25, "w":6.25},
+                { "matrix": [5,  8], "label":"Alt", "x":10, "y":5.25},
+                { "matrix": [5,  9], "label":"Fn", "x":11, "y":5.25},
+                { "matrix": [5, 10], "label":"Ctrl", "x":12, "y":5.25},
+                { "matrix": [5, 12], "label":"\u2190", "x":13.25, "y":5.5},
+                { "matrix": [5, 13], "label":"\u2193", "x":14.25, "y":5.5},
+                { "matrix": [5, 14], "label":"\u2192", "x":15.25, "y":5.5}
+            ]
+        }
+    },
+    "rgb_matrix": {
+        "layout": [
+            { "flags": 2, "x": 2, "y": 0 },
+            { "flags": 2, "x": 22, "y": 0 },
+            { "flags": 2, "x": 42, "y": 0 },
+            { "flags": 2, "x": 62, "y": 0 },
+            { "flags": 2, "x": 82, "y": 0 },
+            { "flags": 2, "x": 102, "y": 0 },
+            { "flags": 2, "x": 122, "y": 0 },
+            { "flags": 2, "x": 142, "y": 0 },
+            { "flags": 2, "x": 162, "y": 0 },
+            { "flags": 2, "x": 182, "y": 0 },
+            { "flags": 2, "x": 202, "y": 0 },
+            { "flags": 2, "x": 222, "y": 0 },
+            { "flags": 2, "x": 0, "y": 7 },
+            { "flags": 4, "matrix": [0, 0], "x": 6, "y": 8 },
+            { "flags": 4, "matrix": [0, 1], "x": 24, "y": 8 },
+            { "flags": 4, "matrix": [0, 2], "x": 37, "y": 8 },
+            { "flags": 4, "matrix": [0, 3], "x": 51, "y": 8 },
+            { "flags": 4, "matrix": [0, 4], "x": 66, "y": 8 },
+            { "flags": 4, "matrix": [0, 5], "x": 82, "y": 8 },
+            { "flags": 4, "matrix": [0, 6], "x": 96, "y": 8 },
+            { "flags": 4, "matrix": [0, 7], "x": 110, "y": 8 },
+            { "flags": 4, "matrix": [0, 8], "x": 124, "y": 8 },
+            { "flags": 4, "matrix": [0, 9], "x": 141, "y": 8 },
+            { "flags": 4, "matrix": [0, 10], "x": 155, "y": 8 },
+            { "flags": 4, "matrix": [0, 11], "x": 169, "y": 8 },
+            { "flags": 4, "matrix": [0, 12], "x": 182, "y": 8 },
+            { "flags": 4, "matrix": [0, 13], "x": 199, "y": 8 },
+            { "flags": 2, "x": 224, "y": 4 },
+            { "flags": 2, "x": 0, "y": 12 },
+            { "flags": 4, "matrix": [1, 0], "x": 6, "y": 20 },
+            { "flags": 4, "matrix": [1, 1], "x": 20, "y": 20 },
+            { "flags": 4, "matrix": [1, 2], "x": 34, "y": 20 },
+            { "flags": 4, "matrix": [1, 3], "x": 48, "y": 20 },
+            { "flags": 4, "matrix": [1, 4], "x": 62, "y": 20 },
+            { "flags": 4, "matrix": [1, 5], "x": 75, "y": 20 },
+            { "flags": 4, "matrix": [1, 6], "x": 90, "y": 20 },
+            { "flags": 4, "matrix": [1, 7], "x": 103, "y": 20 },
+            { "flags": 4, "matrix": [1, 8], "x": 117, "y": 20 },
+            { "flags": 4, "matrix": [1, 9], "x": 130, "y": 20 },
+            { "flags": 4, "matrix": [1, 10], "x": 144, "y": 20 },
+            { "flags": 4, "matrix": [1, 11], "x": 158, "y": 20 },
+            { "flags": 4, "matrix": [1, 12], "x": 170, "y": 20 },
+            { "flags": 4, "matrix": [1, 13], "x": 192, "y": 20 },
+            { "flags": 4, "matrix": [1, 14], "x": 217, "y": 20 },
+            { "flags": 2, "x": 224, "y": 12 },
+            { "flags": 2, "x": 0, "y": 22 },
+            { "flags": 4, "matrix": [2, 0], "x": 10, "y": 30 },
+            { "flags": 4, "matrix": [2, 1], "x": 27, "y": 30 },
+            { "flags": 4, "matrix": [2, 2], "x": 41, "y": 30 },
+            { "flags": 4, "matrix": [2, 3], "x": 54, "y": 30 },
+            { "flags": 4, "matrix": [2, 4], "x": 69, "y": 30 },
+            { "flags": 4, "matrix": [2, 5], "x": 82, "y": 30 },
+            { "flags": 4, "matrix": [2, 6], "x": 96, "y": 30 },
+            { "flags": 4, "matrix": [2, 7], "x": 110, "y": 30 },
+            { "flags": 4, "matrix": [2, 8], "x": 123, "y": 30 },
+            { "flags": 4, "matrix": [2, 9], "x": 138, "y": 30 },
+            { "flags": 4, "matrix": [2, 10], "x": 151, "y": 30 },
+            { "flags": 4, "matrix": [2, 11], "x": 165, "y": 30 },
+            { "flags": 4, "matrix": [2, 12], "x": 179, "y": 30 },
+            { "flags": 4, "matrix": [2, 13], "x": 196, "y": 30 },
+            { "flags": 4, "matrix": [2, 14], "x": 217, "y": 30 },
+            { "flags": 2, "x": 224, "y": 22 },
+            { "flags": 4, "matrix": [3, 0], "x": 11, "y": 40 },
+            { "flags": 4, "matrix": [3, 1], "x": 30, "y": 40 },
+            { "flags": 4, "matrix": [3, 2], "x": 44, "y": 40 },
+            { "flags": 4, "matrix": [3, 3], "x": 57, "y": 40 },
+            { "flags": 4, "matrix": [3, 4], "x": 72, "y": 40 },
+            { "flags": 4, "matrix": [3, 5], "x": 85, "y": 40 },
+            { "flags": 4, "matrix": [3, 6], "x": 99, "y": 40 },
+            { "flags": 4, "matrix": [3, 7], "x": 113, "y": 40 },
+            { "flags": 4, "matrix": [3, 8], "x": 126, "y": 40 },
+            { "flags": 4, "matrix": [3, 9], "x": 140, "y": 40 },
+            { "flags": 4, "matrix": [3, 10], "x": 154, "y": 40 },
+            { "flags": 4, "matrix": [3, 11], "x": 169, "y": 40 },
+            { "flags": 4, "matrix": [3, 12], "x": 190, "y": 40 },
+            { "flags": 4, "matrix": [3, 14], "x": 217, "y": 40 },
+            { "flags": 2, "x": 0, "y": 42 },
+            { "flags": 4, "matrix": [4, 0], "x": 15, "y": 50 },
+            { "flags": 4, "matrix": [4, 1], "x": 37, "y": 50 },
+            { "flags": 4, "matrix": [4, 2], "x": 51, "y": 50 },
+            { "flags": 4, "matrix": [4, 3], "x": 66, "y": 50 },
+            { "flags": 4, "matrix": [4, 4], "x": 79, "y": 50 },
+            { "flags": 4, "matrix": [4, 5], "x": 93, "y": 50 },
+            { "flags": 4, "matrix": [4, 6], "x": 107, "y": 50 },
+            { "flags": 4, "matrix": [4, 7], "x": 120, "y": 50 },
+            { "flags": 4, "matrix": [4, 8], "x": 134, "y": 50 },
+            { "flags": 4, "matrix": [4, 9], "x": 148, "y": 50 },
+            { "flags": 4, "matrix": [4, 10], "x": 161, "y": 50 },
+            { "flags": 4, "matrix": [4, 11], "x": 180, "y": 50 },
+            { "flags": 4, "matrix": [4, 13], "x": 202, "y": 53 },
+            { "flags": 2, "x": 224, "y": 42 },
+            { "flags": 2, "x": 0, "y": 51 },
+            { "flags": 4, "matrix": [5, 0], "x": 8, "y": 60 },
+            { "flags": 4, "matrix": [5, 1], "x": 26, "y": 60 },
+            { "flags": 4, "matrix": [5, 2], "x": 42, "y": 60 },
+            { "flags": 4, "matrix": [5, 5], "x": 94, "y": 60 },
+            { "flags": 4, "matrix": [5, 8], "x": 144, "y": 60 },
+            { "flags": 4, "matrix": [5, 9], "x": 158, "y": 60 },
+            { "flags": 4, "matrix": [5, 10], "x": 172, "y": 60 },
+            { "flags": 4, "matrix": [5, 12], "x": 189, "y": 63 },
+            { "flags": 4, "matrix": [5, 13], "x": 202, "y": 63 },
+            { "flags": 4, "matrix": [5, 14], "x": 217, "y": 63 },
+            { "flags": 2, "x": 224, "y": 51 },
+            { "flags": 2, "x": 9,   "y": 64 },
+            { "flags": 2, "x": 38,  "y": 64 },
+            { "flags": 2, "x": 69,  "y": 64 },
+            { "flags": 2, "x": 96,  "y": 64 },
+            { "flags": 2, "x": 125, "y": 64 },
+            { "flags": 2, "x": 154, "y": 64 },
+            { "flags": 2, "x": 182, "y": 64 },
+            { "flags": 2, "x": 211, "y": 64 }
+        ]
+    },
+    "encoder": {
+        "rotary": [
+            { "pin_a": "B5", "pin_b": "B4", "resolution": 2 }
+        ]
+    }
+}
diff --git a/keyboards/drop/sense75/keymaps/default/keymap.c b/keyboards/drop/sense75/keymaps/default/keymap.c
new file mode 100644
index 0000000000..05b351f865
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/default/keymap.c
@@ -0,0 +1,52 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+     /*
+     * ┌───┐┌───┬───┬───┬───┐┌───┬───┬───┬───┐┌───┬───┬───┬───┐┌───┐┌───┐
+     * │Esc││F1 │F2 │F3 │F4 ││F5 │F6 │F7 │F8 ││F9 │F10│F11│F12││PSc││   │
+     * └───┘└───┴───┴───┴───┘└───┴───┴───┴───┴└───┴───┴───┴───┘└───┘└───┘
+     * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐┌───┐
+     * │ ` │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ 9 │ 0 │ - │ = │ Backsp││Del│
+     * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤├───┤
+     * │ Tab │ Q │ W │ E │ R │ T │ Y │ U │ I │ O │ P │ [ │ ] │  \  ││PgU│
+     * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┤├───┤
+     * │ Caps │ A │ S │ D │ F │ G │ H │ J │ K │ L │ ; │ ' │  Enter ││PgD│
+     * ├──────┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┘└───┘
+     * │ Shift  │ Z │ X │ C │ V │ B │ N │ M │ , │ . │ / │ Shift│┌───┐
+     * ├────┬───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴──┬┴──┬┴──┬───┘│ ↑ │
+     * │Ctrl│GUI │Alt │                        │Alt│GUI│Ctl│┌───┼───┼───┐
+     * └────┴────┴────┴────────────────────────┴───┴───┴───┘│ ← │ ↓ │ → │
+     *                                                      └───┴───┴───┘
+     */
+    [0] = LAYOUT(
+        KC_ESC,  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_PSCR,          KC_MUTE,
+        KC_GRV,  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_DEL,
+        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_PGUP,
+        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_ENT,           KC_PGDN,
+        KC_LSFT,          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, MO(1),   KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [1] = LAYOUT(
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          KC_MPLY,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, QK_BOOT,          _______,
+        _______, RGB_TOG, RGB_VAI, RGB_SPI, RGB_HUI, RGB_SAI, _______, _______, _______, _______, _______, _______, _______, _______,          KC_HOME,
+        _______, RGB_MOD, RGB_VAD, RGB_SPD, RGB_HUD, RGB_SAD, _______, _______, _______, _______, _______, _______,          _______,          KC_END,
+        _______,          RGB_M_P, RGB_M_B, RGB_M_R, RGB_M_SW,_______, NK_TOGG, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______,                            EE_CLR,                             _______, _______, _______, _______, _______, _______
+    )
+};
+
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][2] = {
+    [0] = { ENCODER_CCW_CW(KC_VOLD, KC_VOLU) },
+    [1] = { ENCODER_CCW_CW(KC_MPRV, KC_MNXT) }
+};
+#endif
+
+void rgb_matrix_indicators_user(void) {
+    if (host_keyboard_led_state().caps_lock) {
+        rgb_matrix_set_color(62, RGB_WHITE);
+    }
+}
diff --git a/keyboards/drop/sense75/keymaps/default/rules.mk b/keyboards/drop/sense75/keymaps/default/rules.mk
new file mode 100644
index 0000000000..ee32568148
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/default/rules.mk
@@ -0,0 +1 @@
+ENCODER_MAP_ENABLE = yes
diff --git a/keyboards/drop/sense75/keymaps/default_md/keymap.c b/keyboards/drop/sense75/keymaps/default_md/keymap.c
new file mode 100644
index 0000000000..eb8b6b1f4b
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/default_md/keymap.c
@@ -0,0 +1,136 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include QMK_KEYBOARD_H
+
+enum custom_keycodes {
+    TEST_1 = SAFE_RANGE,
+    TEST_2,
+    TEST_3,
+    TEST_4,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+     /*
+     * ┌───┐┌───┬───┬───┬───┐┌───┬───┬───┬───┐┌───┬───┬───┬───┐┌───┐┌───┐
+     * │Esc││F1 │F2 │F3 │F4 ││F5 │F6 │F7 │F8 ││F9 │F10│F11│F12││PSc││   │
+     * └───┘└───┴───┴───┴───┘└───┴───┴───┴───┴└───┴───┴───┴───┘└───┘└───┘
+     * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐┌───┐
+     * │ ` │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ 9 │ 0 │ - │ = │ Backsp││Del│
+     * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤├───┤
+     * │ Tab │ Q │ W │ E │ R │ T │ Y │ U │ I │ O │ P │ [ │ ] │  \  ││PgU│
+     * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┤├───┤
+     * │ Caps │ A │ S │ D │ F │ G │ H │ J │ K │ L │ ; │ ' │  Enter ││PgD│
+     * ├──────┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┘└───┘
+     * │ Shift  │ Z │ X │ C │ V │ B │ N │ M │ , │ . │ / │ Shift│┌───┐
+     * ├────┬───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴──┬┴──┬┴──┬───┘│ ↑ │
+     * │Ctrl│GUI │Alt │                        │Alt│GUI│Ctl│┌───┼───┼───┐
+     * └────┴────┴────┴────────────────────────┴───┴───┴───┘│ ← │ ↓ │ → │
+     *                                                      └───┴───┴───┘
+     */
+    [0] = LAYOUT(
+        KC_ESC,  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_PSCR,          KC_MUTE,
+        KC_GRV,  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_DEL,
+        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_PGUP,
+        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_ENT,           KC_PGDN,
+        KC_LSFT,          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, MO(1),   KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [1] = LAYOUT(
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          KC_MPLY,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, QK_BOOT,          _______,
+        _______, RGB_TOG, RGB_VAI, RGB_SPI, RGB_HUI, RGB_SAI, _______, _______, _______, _______, _______, _______, _______, _______,          KC_HOME,
+        _______, RGB_MOD, RGB_VAD, RGB_SPD, RGB_HUD, RGB_SAD, _______, _______, _______, _______, _______, _______,          _______,          KC_END,
+        _______,          RGB_M_P, RGB_M_B, RGB_M_R, RGB_M_SW,_______, NK_TOGG, _______, _______, _______, _______,          _______, _______,
+        MO(2),   _______, _______,                            EE_CLR,                             _______, _______, _______, _______, _______, _______
+    ),
+    [2] = LAYOUT(
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,
+        _______, TEST_1,  TEST_2,  TEST_3,  TEST_4,  _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, AG_TOGG, _______, _______, _______, CL_TOGG,          _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,          _______,
+        _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______,                            _______,                            _______, _______, _______, _______, _______, _______
+    )
+};
+
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][2] = {
+    [0] = { ENCODER_CCW_CW(KC_VOLD, KC_VOLU) },
+    [1] = { ENCODER_CCW_CW(KC_MPRV, KC_MNXT) },
+    [2] = { ENCODER_CCW_CW(_______, _______) }
+};
+#endif
+
+static bool test_mode = false;
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    if (!record->event.pressed) {
+        switch (keycode) {
+            case TEST_1:
+                rgb_matrix_mode_noeeprom(RGB_MATRIX_SOLID_COLOR);
+                rgb_matrix_sethsv_noeeprom(HSV_RED);
+                test_mode = true;
+                break;
+            case TEST_2:
+                rgb_matrix_mode_noeeprom(RGB_MATRIX_SOLID_COLOR);
+                rgb_matrix_sethsv_noeeprom(HSV_GREEN);
+                test_mode = true;
+                break;
+            case TEST_3:
+                rgb_matrix_mode_noeeprom(RGB_MATRIX_SOLID_COLOR);
+                rgb_matrix_sethsv_noeeprom(HSV_BLUE);
+                test_mode = true;
+                break;
+            case TEST_4:
+                rgb_matrix_mode_noeeprom(RGB_MATRIX_SOLID_COLOR);
+                rgb_matrix_sethsv_noeeprom(HSV_WHITE);
+                test_mode = true;
+                break;
+            case RGB_TOG:
+                switch (rgb_matrix_get_flags()) {
+                    case LED_FLAG_ALL:
+                        rgb_matrix_set_flags(LED_FLAG_KEYLIGHT | LED_FLAG_MODIFIER | LED_FLAG_INDICATOR);
+                        break;
+                    case (LED_FLAG_KEYLIGHT | LED_FLAG_MODIFIER | LED_FLAG_INDICATOR):
+                        rgb_matrix_set_flags(LED_FLAG_UNDERGLOW);
+                        break;
+                    case LED_FLAG_UNDERGLOW:
+                        rgb_matrix_set_flags(LED_FLAG_NONE);
+                        break;
+                    default:
+                        rgb_matrix_set_flags(LED_FLAG_ALL);
+                        break;
+                }
+                return false;
+        }
+    }
+    return true;
+};
+
+void rgb_matrix_indicators_user(void) {
+    if (host_keyboard_led_state().caps_lock) {
+        rgb_matrix_set_color(62, RGB_WHITE);
+    } else if ((rgb_matrix_get_flags() & (LED_FLAG_KEYLIGHT | LED_FLAG_MODIFIER | LED_FLAG_INDICATOR)) == 0) {
+        rgb_matrix_set_color(62, RGB_OFF);
+    }
+
+    if (get_highest_layer(layer_state) == 2) {
+        if (!test_mode) {
+            rgb_matrix_set_color_all(RGB_OFF);
+        }
+
+        if (keymap_config.swap_lalt_lgui) {
+            rgb_matrix_set_color(55, RGB_GREEN);
+        } else {
+            rgb_matrix_set_color(55, RGB_RED);
+        }
+        if (keymap_config.swap_control_capslock) {
+            rgb_matrix_set_color(59, RGB_GREEN);
+        } else {
+            rgb_matrix_set_color(59, RGB_RED);
+        }
+    } else if ((rgb_matrix_get_flags() & (LED_FLAG_KEYLIGHT | LED_FLAG_MODIFIER | LED_FLAG_INDICATOR)) == 0) {
+        rgb_matrix_set_color(55, RGB_OFF);
+        rgb_matrix_set_color(59, RGB_OFF);
+    }
+}
diff --git a/keyboards/drop/sense75/keymaps/default_md/readme.md b/keyboards/drop/sense75/keymaps/default_md/readme.md
new file mode 100644
index 0000000000..d954886bcd
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/default_md/readme.md
@@ -0,0 +1 @@
+# The stock firmware the keyboard ships with
diff --git a/keyboards/drop/sense75/keymaps/default_md/rules.mk b/keyboards/drop/sense75/keymaps/default_md/rules.mk
new file mode 100644
index 0000000000..ee32568148
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/default_md/rules.mk
@@ -0,0 +1 @@
+ENCODER_MAP_ENABLE = yes
diff --git a/keyboards/drop/sense75/keymaps/via/config.h b/keyboards/drop/sense75/keymaps/via/config.h
new file mode 100644
index 0000000000..2b0c8330d0
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/via/config.h
@@ -0,0 +1,5 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define DYNAMIC_KEYMAP_LAYER_COUNT 8
diff --git a/keyboards/drop/sense75/keymaps/via/keymap.c b/keyboards/drop/sense75/keymaps/via/keymap.c
new file mode 100644
index 0000000000..c1e3c4edf3
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/via/keymap.c
@@ -0,0 +1,79 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+     /*
+     * ┌───┐┌───┬───┬───┬───┐┌───┬───┬───┬───┐┌───┬───┬───┬───┐┌───┐┌───┐
+     * │Esc││F1 │F2 │F3 │F4 ││F5 │F6 │F7 │F8 ││F9 │F10│F11│F12││PSc││   │
+     * └───┘└───┴───┴───┴───┘└───┴───┴───┴───┴└───┴───┴───┴───┘└───┘└───┘
+     * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐┌───┐
+     * │ ` │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ 9 │ 0 │ - │ = │ Backsp││Del│
+     * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤├───┤
+     * │ Tab │ Q │ W │ E │ R │ T │ Y │ U │ I │ O │ P │ [ │ ] │  \  ││PgU│
+     * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┤├───┤
+     * │ Caps │ A │ S │ D │ F │ G │ H │ J │ K │ L │ ; │ ' │  Enter ││PgD│
+     * ├──────┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴────┬───┘└───┘
+     * │ Shift  │ Z │ X │ C │ V │ B │ N │ M │ , │ . │ / │ Shift│┌───┐
+     * ├────┬───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴──┬┴──┬┴──┬───┘│ ↑ │
+     * │Ctrl│GUI │Alt │                        │Alt│GUI│Ctl│┌───┼───┼───┐
+     * └────┴────┴────┴────────────────────────┴───┴───┴───┘│ ← │ ↓ │ → │
+     *                                                      └───┴───┴───┘
+     */
+    [0] = LAYOUT(
+        KC_ESC,  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_PSCR,          KC_MUTE,
+        KC_GRV,  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_DEL,
+        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_PGUP,
+        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_ENT,           KC_PGDN,
+        KC_LSFT,          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, MO(1),   KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [1] = LAYOUT(
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          KC_MPLY,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, QK_BOOT,          _______,
+        _______, RGB_TOG, RGB_VAI, RGB_SPI, RGB_HUI, RGB_SAI, _______, _______, _______, _______, _______, _______, _______, _______,          KC_HOME,
+        _______, RGB_MOD, RGB_VAD, RGB_SPD, RGB_HUD, RGB_SAD, _______, _______, _______, _______, _______, _______,          _______,          KC_END,
+        _______,          RGB_M_P, RGB_M_B, RGB_M_R, RGB_M_SW,_______, NK_TOGG, _______, _______, _______, _______,          _______, _______,
+        MO(2),   _______, _______,                            EE_CLR,                             _______, _______, _______, _______, _______, _______
+    ),
+    [2] = LAYOUT(
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, AG_TOGG, _______, _______, _______, CL_TOGG,          _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,          _______,
+        _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______,                            _______,                            _______, _______, _______, _______, _______, _______
+    )
+};
+
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][2] = {
+    [0] = { ENCODER_CCW_CW(KC_VOLD, KC_VOLU) },
+    [1] = { ENCODER_CCW_CW(KC_MPRV, KC_MNXT) },
+    [2] = { ENCODER_CCW_CW(_______, _______) }
+};
+#endif
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    if (!record->event.pressed) {
+        switch (keycode) {
+            case RGB_TOG:
+                switch (rgb_matrix_get_flags()) {
+                    case LED_FLAG_ALL:
+                        rgb_matrix_set_flags(LED_FLAG_KEYLIGHT | LED_FLAG_MODIFIER | LED_FLAG_INDICATOR);
+                        break;
+                    case (LED_FLAG_KEYLIGHT | LED_FLAG_MODIFIER | LED_FLAG_INDICATOR):
+                        rgb_matrix_set_flags(LED_FLAG_UNDERGLOW);
+                        break;
+                    case LED_FLAG_UNDERGLOW:
+                        rgb_matrix_set_flags(LED_FLAG_NONE);
+                        break;
+                    default:
+                        rgb_matrix_set_flags(LED_FLAG_ALL);
+                        break;
+                }
+                return false;
+        }
+    }
+    return true;
+};
diff --git a/keyboards/drop/sense75/keymaps/via/rules.mk b/keyboards/drop/sense75/keymaps/via/rules.mk
new file mode 100644
index 0000000000..f1adcab005
--- /dev/null
+++ b/keyboards/drop/sense75/keymaps/via/rules.mk
@@ -0,0 +1,2 @@
+VIA_ENABLE = yes
+ENCODER_MAP_ENABLE = yes
diff --git a/keyboards/drop/sense75/mcuconf.h b/keyboards/drop/sense75/mcuconf.h
new file mode 100644
index 0000000000..e8a0486ce0
--- /dev/null
+++ b/keyboards/drop/sense75/mcuconf.h
@@ -0,0 +1,14 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include_next <mcuconf.h>
+
+#undef STM32_PLLM_VALUE
+#define STM32_PLLM_VALUE 16
+
+#undef STM32_PREDIV_VALUE
+#define STM32_PREDIV_VALUE 2
+
+#undef STM32_I2C_USE_I2C1
+#define STM32_I2C_USE_I2C1 TRUE
diff --git a/keyboards/drop/sense75/readme.md b/keyboards/drop/sense75/readme.md
new file mode 100644
index 0000000000..bb0bb72a05
--- /dev/null
+++ b/keyboards/drop/sense75/readme.md
@@ -0,0 +1,24 @@
+# SENSE75
+
+![SENSE75](https://massdrop-s3.imgix.net/img_thread/1660887363422.771277068120058315243585-5419copycrop.jpg?auto=format&fm=jpg&fit=max&w=500&h=868&dpr=2)
+
+* Keyboard Maintainer: [zvecr](https://github.com/zvecr)
+* Hardware Availability: <https://drop.com/buy/drop-sense75-mechanical-keyboard>
+
+Make example for this keyboard (after setting up your build environment):
+
+    make drop/sense75:default
+
+Flashing example for this keyboard:
+
+    make drop/sense75: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 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Press and hold the button under the space bar
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
diff --git a/keyboards/drop/sense75/rules.mk b/keyboards/drop/sense75/rules.mk
new file mode 100644
index 0000000000..781ba9b35a
--- /dev/null
+++ b/keyboards/drop/sense75/rules.mk
@@ -0,0 +1,2 @@
+EEPROM_DRIVER = i2c
+RGB_MATRIX_DRIVER = IS31FL3733
diff --git a/keyboards/drop/sense75/sense75.c b/keyboards/drop/sense75/sense75.c
new file mode 100644
index 0000000000..8087f5c72e
--- /dev/null
+++ b/keyboards/drop/sense75/sense75.c
@@ -0,0 +1,148 @@
+// Copyright 2022 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include "rgb_matrix.h"
+
+#ifdef RGB_MATRIX_ENABLE
+const is31_led PROGMEM g_is31_leds[DRIVER_LED_TOTAL] = {
+// top underglow sd2-sd17
+    { 0, B_2,  A_2,  C_2  },
+    { 0, B_3,  A_3,  C_3  },
+    { 0, B_5,  A_5,  C_5  },
+    { 0, B_6,  A_6,  C_6  },
+    { 0, B_7,  A_7,  C_7  },
+    { 0, B_9,  A_9,  C_9  },
+    { 0, B_10, A_10, C_10 },
+    { 0, B_12, A_12, C_12 },
+    { 0, B_13, A_13, C_13 },
+    { 0, B_14, A_14, C_14 },
+    { 0, B_16, A_16, C_16 },
+    { 1, B_12, A_12, C_12 },
+
+// sd1 + function + sd18
+    { 0, B_1,  A_1,  C_1  },
+    { 0, E_2,  D_2,  F_2  },
+    { 0, E_3,  D_3,  F_3  },
+    { 0, E_4,  D_4,  F_4  },
+    { 0, E_5,  D_5,  F_5  },
+    { 0, E_6,  D_6,  F_6  },
+    { 0, E_7,  D_7,  F_7  },
+    { 0, E_8,  D_8,  F_8  },
+    { 0, E_9,  D_9,  F_9  },
+    { 0, E_10, D_10, F_10 },
+    { 0, E_11, D_11, F_11 },
+    { 0, E_12, D_12, F_12 },
+    { 0, E_13, D_13, F_13 },
+    { 0, E_14, D_14, F_14 },
+    { 0, E_15, D_15, F_15 },
+    // <enc gap>
+    { 1, B_13, A_13, C_13 },
+
+// sd45 + num + sd20
+    { 0, H_1,  G_1,  I_1  },
+    { 0, H_2,  G_2,  I_2  },
+    { 0, H_3,  G_3,  I_3  },
+    { 0, H_4,  G_4,  I_4  },
+    { 0, H_5,  G_5,  I_5  },
+    { 0, H_6,  G_6,  I_6  },
+    { 0, H_7,  G_7,  I_7  },
+    { 0, H_8,  G_8,  I_8  },
+    { 0, H_9,  G_9,  I_9  },
+    { 0, H_10, G_10, I_10 },
+    { 0, H_11, G_11, I_11 },
+    { 0, H_12, G_12, I_12 },
+    { 0, H_13, G_13, I_13 },
+    { 0, H_14, G_14, I_14 },
+    { 0, H_15, G_15, I_15 },
+    { 0, H_16, G_16, I_16 },
+    { 1, B_15, A_15, C_15 },
+
+// 44+ qwer 21
+    { 0, K_1,  J_1,  L_1  },
+    { 0, K_2,  J_2,  L_2  },
+    { 0, K_3,  J_3,  L_3  },
+    { 0, K_4,  J_4,  L_4  },
+    { 0, K_5,  J_5,  L_5  },
+    { 0, K_6,  J_6,  L_6  },
+    { 0, K_7,  J_7,  L_7  },
+    { 0, K_8,  J_8,  L_8  },
+    { 0, K_9,  J_9,  L_9  },
+    { 0, K_10, J_10, L_10 },
+    { 0, K_11, J_11, L_11 },
+    { 0, K_12, J_12, L_12 },
+    { 0, K_13, J_13, L_13 },
+    { 0, K_14, J_14, L_14 },
+    { 0, K_15, J_15, L_15 },
+    { 0, K_16, J_16, L_16 },
+    { 1, B_16, A_16, C_16 },
+
+// asdf
+    { 1, B_2,  A_2,  C_2  },
+    { 1, B_3,  A_3,  C_3  },
+    { 1, B_4,  A_4,  C_4  },
+    { 1, B_5,  A_5,  C_5  },
+    { 1, B_6,  A_6,  C_6  },
+    { 1, B_7,  A_7,  C_7  },
+    { 1, B_8,  A_8,  C_8  },
+    { 1, B_9,  A_9,  C_9  },
+    { 1, B_10, A_10, C_10 },
+    { 1, B_11, A_11, C_11 },
+    { 1, E_12, D_12, F_12 },
+    { 1, E_13, D_13, F_13 },
+    { 1, E_14, D_14, F_14 },
+    { 1, H_15, G_15, I_15 },
+
+// 43 + zxcv + 22
+    { 1, B_1,  A_1,  C_1  },
+    { 1, E_2,  D_2,  F_2  },
+    { 1, E_3,  D_3,  F_3  },
+    { 1, E_4,  D_4,  F_4  },
+    { 1, E_5,  D_5,  F_5  },
+    { 1, E_6,  D_6,  F_6  },
+    { 1, E_7,  D_7,  F_7  },
+    { 1, E_8,  D_8,  F_8  },
+    { 1, E_9,  D_9,  F_9  },
+    { 1, E_10, D_10, F_10 },
+    { 1, E_11, D_11, F_11 },
+    { 1, H_12, G_12, I_12 },
+    { 1, H_13, G_13, I_13 },
+    { 1, H_14, G_14, I_14 },
+    { 1, E_15, D_15, F_15 },
+
+// 41 + mods + 23
+    { 1, H_1,  G_1,  I_1  },
+    { 1, H_2,  G_2,  I_2  },
+    { 1, H_3,  G_3,  I_3  },
+    { 1, H_4,  G_4,  I_4  },
+    { 1, H_5,  G_5,  I_5  },
+    { 1, H_6,  G_6,  I_6  },
+    { 1, H_7,  G_7,  I_7  },
+    { 1, H_8,  G_8,  I_8  },
+    { 1, H_9,  G_9,  I_9  },
+    { 1, H_10, G_10, I_10 },
+    { 1, H_11, G_11, I_11 },
+    { 1, E_16, D_16, F_16 },
+
+// bottom underglow 24 - 39
+    { 1, K_2,  J_2,  L_2  },
+    { 1, K_3,  J_3,  L_3  },
+    { 1, K_4,  J_4,  L_4  },
+    { 1, K_6,  J_6,  L_6  },
+    { 1, K_10, J_10, L_10 },
+    { 1, K_13, J_13, L_13 },
+    { 1, K_15, J_15, L_15 },
+    { 1, H_16, G_16, I_16 }
+};
+#endif
+
+#ifdef ENCODER_ENABLE
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!encoder_update_user(index, clockwise)) return false;
+
+    if (clockwise) {
+        tap_code(KC_VOLU);
+    } else {
+        tap_code(KC_VOLD);
+    }
+    return false; 
+}
+#endif