diff --git a/src/adafruit_blinka/board/horizon/rdkx3.py b/src/adafruit_blinka/board/horizon/rdkx3.py
new file mode 100644
index 00000000..e132cb17
--- /dev/null
+++ b/src/adafruit_blinka/board/horizon/rdkx3.py
@@ -0,0 +1,54 @@
+# SPDX-FileCopyrightText: 2024 Hajime Fujimoto
+#
+# SPDX-License-Identifier: MIT
+"""Pin definitions for RDK-X3."""
+
+from adafruit_blinka.microcontroller.horizon.sunrise_x3 import pin
+
+D0 = pin.D0
+D1 = pin.D1
+
+D2 = pin.D2
+SDA = pin.SDA
+D3 = pin.D3
+SCL = pin.SCL
+
+D4 = pin.D4
+D5 = pin.D5
+D6 = pin.D6
+
+D7 = pin.D7
+CE1 = pin.D7
+D8 = pin.D8
+CE0 = pin.D8
+D9 = pin.D9
+MISO = pin.D9
+D10 = pin.D10
+MOSI = pin.D10
+D11 = pin.D11
+SCLK = pin.D11
+SCK = pin.D11
+
+D12 = pin.D12
+D13 = pin.D13
+
+D14 = pin.D14
+TXD = pin.D14
+D15 = pin.D15
+RXD = pin.D15
+# create alias for most of the examples
+TX = pin.D14
+RX = pin.D15
+
+D16 = pin.D16
+D17 = pin.D17
+D18 = pin.D18
+D19 = pin.D19
+D20 = pin.D20
+D21 = pin.D21
+D22 = pin.D22
+D23 = pin.D23
+D24 = pin.D24
+D25 = pin.D25
+D26 = pin.D26
+D27 = pin.D27
diff --git a/src/adafruit_blinka/microcontroller/horizon/pwmio/PWMOut.py b/src/adafruit_blinka/microcontroller/horizon/pwmio/PWMOut.py
new file mode 100644
index 00000000..b940b775
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/horizon/pwmio/PWMOut.py
@@ -0,0 +1,174 @@
+# SPDX-FileCopyrightText: 2024 Hajime Fujimoto
+#
+# SPDX-License-Identifier: MIT
+"""Custom PWMOut Wrapper for Hobot.GPIO PWM Class"""
+from Hobot import GPIO
+
+GPIO.setmode(GPIO.BCM)  # Use BCM pins D4 = GPIO #4
+GPIO.setwarnings(False)  # shh!
+GPIO.cleanup()
+
+
+# pylint: disable=unnecessary-pass
+class PWMError(IOError):
+    """Base class for PWM errors."""
+
+    pass
+
+
+# pylint: enable=unnecessary-pass
+
+
+class PWMOut:
+    """Pulse Width Modulation Output Class"""
+
+    def __init__(self, pin, *, frequency=48000, duty_cycle=0, variable_frequency=False):
+        self._pwmpin = None
+        self._period = 0
+        self._open(pin, duty_cycle, frequency, variable_frequency)
+
+    def __del__(self):
+        self.deinit()
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, t, value, traceback):
+        self.deinit()
+
+    def _open(self, pin, duty=0, freq=500, variable_frequency=False):
+        if pin == (0, 25):
+            gpio_pin = 12
+        elif pin == (0, 4):
+            gpio_pin = 13
+        else:
+            raise ValueError("PWM is only available on D12 or D13.")
+        self._pin = gpio_pin
+        GPIO.setmode(GPIO.BCM)
+        #        GPIO.setup(self._pin, GPIO.OUT)
+        self._pwmpin = GPIO.PWM(self._pin, freq)
+
+        if variable_frequency:
+            print("Variable Frequency is not supported, continuing without it...")
+
+        # set frequency
+        self.frequency = freq
+        # set duty
+        duty = 656 if duty <= 656 else duty
+        self.duty_cycle = duty
+
+        self.enabled = True
+
+    def deinit(self):
+        """Deinit the PWM."""
+        if self._pwmpin is not None:
+            self._pwmpin.stop()
+            GPIO.cleanup(self._pin)
+            self._pwmpin = None
+
+    def _is_deinited(self):
+        if self._pwmpin is None:
+            raise ValueError(
+                "Object has been deinitialize and can no longer "
+                "be used. Create a new object."
+            )
+
+    @property
+    def period(self):
+        """Get or set the PWM's output period in seconds.
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not int or float.
+
+        :type: int, float
+        """
+        return 1.0 / self.frequency
+
+    @period.setter
+    def period(self, period):
+        if not isinstance(period, (int, float)):
+            raise TypeError("Invalid period type, should be int or float.")
+
+        self.frequency = 1.0 / period
+
+    @property
+    def duty_cycle(self):
+        """Get or set the PWM's output duty cycle which is the fraction of
+        each pulse which is high. 16-bit
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not int or float.
+            ValueError: if value is out of bounds of 0.0 to 1.0.
+
+        :type: int, float
+        """
+        return int(self._duty_cycle * 65535)
+
+    @duty_cycle.setter
+    def duty_cycle(self, duty_cycle):
+        if not isinstance(duty_cycle, (int, float)):
+            raise TypeError("Invalid duty cycle type, should be int or float.")
+
+        if not 0 <= duty_cycle <= 65535:
+            raise ValueError("Invalid duty cycle value, should be between 0 and 65535")
+
+        # convert from 16-bit
+        duty_cycle /= 65535.0
+
+        self._duty_cycle = duty_cycle
+        self._pwmpin.ChangeDutyCycle(round(self._duty_cycle * 100))
+
+    @property
+    def frequency(self):
+        """Get or set the PWM's output frequency in Hertz.
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not int or float.
+
+        :type: int, float
+        """
+
+        return self._frequency
+
+    @frequency.setter
+    def frequency(self, frequency):
+        if not isinstance(frequency, (int, float)):
+            raise TypeError("Invalid frequency type, should be int or float.")
+
+        self._pwmpin.ChangeFrequency(round(frequency))
+        self._frequency = frequency
+
+    @property
+    def enabled(self):
+        """Get or set the PWM's output enabled state.
+
+        Raises:
+            PWMError: if an I/O or OS error occurs.
+            TypeError: if value type is not bool.
+
+        :type: bool
+        """
+        return self._enabled
+
+    @enabled.setter
+    def enabled(self, value):
+        if not isinstance(value, bool):
+            raise TypeError("Invalid enabled type, should be string.")
+
+        if value:
+            self._pwmpin.start(round(self._duty_cycle * 100))
+        else:
+            self._pwmpin.stop()
+
+        self._enabled = value
+
+    # String representation
+    def __str__(self):
+        return "pin %s (freq=%f Hz, duty_cycle=%f%%)" % (
+            self._pin,
+            self.frequency,
+            self.duty_cycle,
+        )
diff --git a/src/adafruit_blinka/microcontroller/horizon/sunrise_x3/pin.py b/src/adafruit_blinka/microcontroller/horizon/sunrise_x3/pin.py
new file mode 100644
index 00000000..0161633a
--- /dev/null
+++ b/src/adafruit_blinka/microcontroller/horizon/sunrise_x3/pin.py
@@ -0,0 +1,55 @@
+# SPDX-FileCopyrightText: 2024 Hajime Fujimoto
+#
+# SPDX-License-Identifier: MIT
+"""A Pin class for use with Horizon Sunrise X3."""
+
+from adafruit_blinka.microcontroller.generic_linux.libgpiod_pin import Pin
+
+D0 = Pin((0, 15))
+D1 = Pin((0, 14))
+D2 = Pin((0, 9))
+D3 = Pin((0, 8))
+D4 = Pin((0, 101))
+D5 = Pin((0, 119))
+D6 = Pin((0, 118))
+D7 = Pin((0, 28))
+D8 = Pin((0, 5))
+D9 = Pin((0, 7))
+D10 = Pin((0, 6))
+D11 = Pin((0, 3))
+D12 = Pin((0, 25))
+D13 = Pin((0, 4))
+D14 = Pin((0, 111))
+D15 = Pin((0, 112))
+D16 = Pin((0, 20))
+D17 = Pin((0, 12))
+D18 = Pin((0, 102))
+D19 = Pin((0, 103))
+D20 = Pin((0, 104))
+D21 = Pin((0, 108))
+D22 = Pin((0, 30))
+D23 = Pin((0, 27))
+D24 = Pin((0, 22))
+D25 = Pin((0, 29))
+D26 = Pin((0, 117))
+D27 = Pin((0, 13))
+
+SDA = D2
+SCL = D3
+MISO = D9
+MOSI = D10
+SCLK = D11
+SCK = D11
+TXD = D14
+RXD = D15
+
+spiPorts = ((1, SCLK, MOSI, MISO),)
+
+uartPorts = ((0, TXD, RXD),)
+
+i2cPorts = ((0, SCL, SDA),)
+
+pwmOuts = (
+    ((0, 0), D12),
+    ((3, 0), D13),
+)
diff --git a/src/board.py b/src/board.py
index c0d141e9..19356388 100644
--- a/src/board.py
+++ b/src/board.py
@@ -440,6 +440,9 @@
 elif board_id == ap_board.INDIEDROID_NOVA:
     from adafruit_blinka.board.ameridroid.indiedroid_nova import *
 
+elif board_id == ap_board.RDK_X3:
+    from adafruit_blinka.board.horizon.rdkx3 import *
+
 elif "sphinx" in sys.modules:
     pass
 
diff --git a/src/digitalio.py b/src/digitalio.py
index 6f04984c..66c0c108 100644
--- a/src/digitalio.py
+++ b/src/digitalio.py
@@ -121,6 +121,8 @@
     from adafruit_blinka.microcontroller.thead.th1520.pin import Pin
 elif detector.chip.K1:
     from adafruit_blinka.microcontroller.spacemit.k1.pin import Pin
+elif detector.chip.SUNRISE_X3:
+    from adafruit_blinka.microcontroller.horizon.sunrise_x3.pin import Pin
 # Special Case Boards
 elif detector.board.ftdi_ft232h:
     from adafruit_blinka.microcontroller.ftdi_mpsse.ft232h.pin import Pin
diff --git a/src/microcontroller/__init__.py b/src/microcontroller/__init__.py
index 2792e7bd..e56d4879 100644
--- a/src/microcontroller/__init__.py
+++ b/src/microcontroller/__init__.py
@@ -159,6 +159,8 @@ def delay_us(delay):
     from adafruit_blinka.microcontroller.thead.th1520 import *
 elif chip_id == ap_chip.K1:
     from adafruit_blinka.microcontroller.spacemit.k1 import *
+elif chip_id == ap_chip.SUNRISE_X3:
+    from adafruit_blinka.microcontroller.horizon.sunrise_x3 import *
 elif chip_id == ap_chip.GENERIC_X86:
     print("WARNING: GENERIC_X86 is not fully supported. Some features may not work.")
 elif chip_id == ap_chip.OS_AGNOSTIC:
diff --git a/src/microcontroller/pin.py b/src/microcontroller/pin.py
index 3d4a560d..da211e5b 100644
--- a/src/microcontroller/pin.py
+++ b/src/microcontroller/pin.py
@@ -153,6 +153,8 @@
     from adafruit_blinka.microcontroller.rockchip.rv1103.pin import *
 elif chip_id == ap_chip.RV1106:
     from adafruit_blinka.microcontroller.rockchip.rv1106.pin import *
+elif chip_id == ap_chip.SUNRISE_X3:
+    from adafruit_blinka.microcontroller.horizon.sunrise_x3.pin import *
 elif "sphinx" in sys.modules:
     # pylint: disable=unused-import
     from adafruit_blinka.microcontroller.generic_micropython import Pin
diff --git a/src/pwmio.py b/src/pwmio.py
index 72ce0d89..0e029a53 100644
--- a/src/pwmio.py
+++ b/src/pwmio.py
@@ -50,6 +50,8 @@
     from adafruit_blinka.microcontroller.generic_linux.sysfs_pwmout import PWMOut
 elif detector.board.any_starfive_id:
     from adafruit_blinka.microcontroller.starfive.JH7110.pwmio import PWMOut
+elif detector.board.any_horizon_board:
+    from adafruit_blinka.microcontroller.horizon.pwmio.PWMOut import PWMOut
 elif detector.board.OS_AGNOSTIC_BOARD:
     from adafruit_blinka.microcontroller.generic_agnostic_board.PWMOut import PWMOut
 elif (