diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/README.md b/ports/rp2/boards/NULLBITS_BIT_C_PRO/README.md
new file mode 100644
index 0000000000..0849108413
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/README.md
@@ -0,0 +1,17 @@
+# nullbits Bit-C PRO
+
+The nullbits Bit-C PRO Board is based on the Raspberry Pi RP2040, and comes in the Arduino Pro Micro footprint.
+
+
+## Board-specific modules
+
+The `board` module contains definitions for the onboard RGB LED.
+
+Example:
+
+```python
+>>> import board
+>>> board.led_red.on()
+>>> board.led_green.on()
+>>> board.led_blue.on()
+```
diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/board.json b/ports/rp2/boards/NULLBITS_BIT_C_PRO/board.json
new file mode 100644
index 0000000000..2aff0580d8
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/board.json
@@ -0,0 +1,20 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "Breadboard Friendly",
+        "RGB LED",
+        "USB-C",
+        "SPI Flash"
+    ],
+    "images": [
+        "nullbits_bit_c_pro.jpg"
+    ],
+    "mcu": "rp2040",
+    "product": "Bit-C PRO",
+    "thumbnail": "",
+    "url": "https://nullbits.co/bit-c-pro",
+    "vendor": "nullbits"
+}
diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/board.py b/ports/rp2/boards/NULLBITS_BIT_C_PRO/board.py
new file mode 100644
index 0000000000..9ee8cc806f
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/board.py
@@ -0,0 +1,7 @@
+from machine import Pin, Signal
+
+led_red = Signal("LED_RED", Pin.OUT, invert=True, value=0)
+led_green = Signal("LED_GREEN", Pin.OUT, invert=True, value=0)
+led_blue = Signal("LED_BLUE", Pin.OUT, invert=True, value=0)
+
+del Pin
diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/manifest.py b/ports/rp2/boards/NULLBITS_BIT_C_PRO/manifest.py
new file mode 100644
index 0000000000..3a6af47a16
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/manifest.py
@@ -0,0 +1,2 @@
+include("$(PORT_DIR)/boards/manifest.py")
+module("board.py")
diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/mpconfigboard.cmake b/ports/rp2/boards/NULLBITS_BIT_C_PRO/mpconfigboard.cmake
new file mode 100644
index 0000000000..050ca347be
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/mpconfigboard.cmake
@@ -0,0 +1,10 @@
+# cmake file for nullbits Bit-C PRO
+
+# The Bit-C PRO is not yet in upstream pico-sdk, so define it here
+# See also: https://github.com/raspberrypi/pico-sdk/tree/master/src/boards/include/boards
+list(APPEND PICO_BOARD_HEADER_DIRS ${MICROPY_BOARD_DIR})
+
+set(PICO_BOARD "nullbits_bit_c_pro")
+
+# Freeze board.py
+set(MICROPY_FROZEN_MANIFEST ${MICROPY_BOARD_DIR}/manifest.py)
diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/mpconfigboard.h b/ports/rp2/boards/NULLBITS_BIT_C_PRO/mpconfigboard.h
new file mode 100644
index 0000000000..e28c379fa7
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/mpconfigboard.h
@@ -0,0 +1,9 @@
+// https://nullbits.co/bit-c-pro
+
+#define MICROPY_HW_BOARD_NAME       "nullbits Bit-C PRO"
+#define MICROPY_HW_FLASH_STORAGE_BYTES (PICO_FLASH_SIZE_BYTES - (1 * 512 * 1024)) // 512K reserved
+
+// RGB LED, active low
+// Red LED   16
+// Green LED 17
+// Blue LED  18
diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/nullbits_bit_c_pro.h b/ports/rp2/boards/NULLBITS_BIT_C_PRO/nullbits_bit_c_pro.h
new file mode 100644
index 0000000000..2e8b03a430
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/nullbits_bit_c_pro.h
@@ -0,0 +1,96 @@
+// Board definition for the nullbits Bit-C PRO
+
+#ifndef _BOARDS_NULLBITS_BIT_C_PRO_H
+#define _BOARDS_NULLBITS_BIT_C_PRO_H
+
+// For board detection
+#define NULLBITS_BIT_C_PRO
+
+// On some samples, the xosc can take longer to stabilize than is usual
+#ifndef PICO_XOSC_STARTUP_DELAY_MULTIPLIER
+#define PICO_XOSC_STARTUP_DELAY_MULTIPLIER 64
+#endif
+
+// --- BOARD SPECIFIC ---
+#define BIT_C_PRO_LED_R_PIN 16
+#define BIT_C_PRO_LED_G_PIN 17
+#define BIT_C_PRO_LED_B_PIN 18
+
+// ------------- UART -------------//
+#ifndef PICO_DEFAULT_UART
+#define PICO_DEFAULT_UART 0
+#endif
+
+#ifndef PICO_DEFAULT_UART_TX_PIN
+#define PICO_DEFAULT_UART_TX_PIN 0
+#endif
+
+#ifndef PICO_DEFAULT_UART_RX_PIN
+#define PICO_DEFAULT_UART_RX_PIN 1
+#endif
+
+// --- LED ---
+// Set the default LED to the Bit-C PRO's B led
+#ifndef PICO_DEFAULT_LED_PIN
+#define PICO_DEFAULT_LED_PIN BIT_C_PRO_LED_B_PIN
+#endif
+
+#ifndef PICO_DEFAULT_LED_PIN_INVERTED
+#define PICO_DEFAULT_LED_PIN_INVERTED 1
+#endif
+// no PICO_DEFAULT_WS2812_PIN
+
+// ------------- I2C -------------//
+#ifndef PICO_DEFAULT_I2C
+#define PICO_DEFAULT_I2C 0
+#endif
+
+#ifndef PICO_DEFAULT_I2C_SDA_PIN
+#define PICO_DEFAULT_I2C_SDA_PIN 2
+#endif
+
+#ifndef PICO_DEFAULT_I2C_SCL_PIN
+#define PICO_DEFAULT_I2C_SCL_PIN 3
+#endif
+
+// ------------- SPI -------------//
+#ifndef PICO_DEFAULT_SPI
+#define PICO_DEFAULT_SPI 0
+#endif
+
+#ifndef PICO_DEFAULT_SPI_TX_PIN
+#define PICO_DEFAULT_SPI_TX_PIN 23
+#endif
+
+#ifndef PICO_DEFAULT_SPI_RX_PIN
+#define PICO_DEFAULT_SPI_RX_PIN 20
+#endif
+
+#ifndef PICO_DEFAULT_SPI_SCK_PIN
+#define PICO_DEFAULT_SPI_SCK_PIN 22
+#endif
+
+#ifndef PICO_DEFAULT_SPI_CSN_PIN
+#define PICO_DEFAULT_SPI_CSN_PIN 21
+#endif
+
+// ------------- FLASH -------------//
+
+// Best performance/compatibility with selected flash
+#define PICO_BOOT_STAGE2_CHOOSE_W25X10CL 1
+
+#ifndef PICO_FLASH_SPI_CLKDIV
+#define PICO_FLASH_SPI_CLKDIV 2
+#endif
+
+// Bit-C PRO has 4MB SPI flash
+#ifndef PICO_FLASH_SIZE_BYTES
+#define PICO_FLASH_SIZE_BYTES (4 * 1024 * 1024)
+#endif
+
+// All boards have B1+ RP2040
+#ifndef PICO_RP2040_B0_SUPPORTED
+#define PICO_RP2040_B0_SUPPORTED 0
+#endif
+
+#endif
diff --git a/ports/rp2/boards/NULLBITS_BIT_C_PRO/pins.csv b/ports/rp2/boards/NULLBITS_BIT_C_PRO/pins.csv
new file mode 100644
index 0000000000..1274effaef
--- /dev/null
+++ b/ports/rp2/boards/NULLBITS_BIT_C_PRO/pins.csv
@@ -0,0 +1,4 @@
+LED,GPIO16
+LED_RED,GPIO16
+LED_GREEN,GPIO17
+LED_BLUE,GPIO18