diff --git a/kmk/common/macros/rotary_encoder.py b/kmk/common/macros/rotary_encoder.py
new file mode 100644
index 0000000..ca6361d
--- /dev/null
+++ b/kmk/common/macros/rotary_encoder.py
@@ -0,0 +1,76 @@
+import math
+
+from kmk.common.event_defs import (hid_report_event, keycode_down_event,
+                                   keycode_up_event)
+from kmk.common.keycodes import Media
+from kmk.common.rotary_encoder import RotaryEncoder
+
+VAL_FALSE = False + 1
+VAL_NONE = True + 2
+VAL_TRUE = True + 1
+VOL_UP_PRESS = keycode_down_event(Media.KC_AUDIO_VOL_UP)
+VOL_UP_RELEASE = keycode_up_event(Media.KC_AUDIO_VOL_UP)
+VOL_DOWN_PRESS = keycode_down_event(Media.KC_AUDIO_VOL_DOWN)
+VOL_DOWN_RELEASE = keycode_up_event(Media.KC_AUDIO_VOL_DOWN)
+
+
+class RotaryEncoderMacro:
+    def __init__(self, pos_pin, neg_pin, slop_history=24, slop_threshold=0.7):
+        self.encoder = RotaryEncoder(pos_pin, neg_pin)
+        self.max_history = slop_history
+        self.history = bytearray(slop_history)
+        self.history_idx = 0
+        self.history_threshold = math.floor(slop_threshold * slop_history)
+
+    def scan(self):
+        # Anti-slop logic
+        self.history[self.history_idx] = 0
+
+        reading = self.encoder.direction()
+        self.history[self.history_idx] = VAL_NONE if reading is None else reading + 1
+
+        self.history_idx += 1
+
+        if self.history_idx >= self.max_history:
+            self.history_idx = 0
+
+        nones = 0
+        trues = 0
+        falses = 0
+
+        for val in self.history:
+            if val == VAL_NONE:
+                nones += 1
+            elif val == VAL_TRUE:
+                trues += 1
+            elif val == VAL_FALSE:
+                falses += 1
+
+        if nones >= self.history_threshold:
+            return None
+
+        if trues >= self.history_threshold:
+            return self.on_increase()
+
+        if falses >= self.history_threshold:
+            return self.on_decrease()
+
+    def on_decrease(self):
+        pass
+
+    def on_increase(self):
+        pass
+
+
+class VolumeRotaryEncoder(RotaryEncoderMacro):
+    def on_decrease(self):
+        yield VOL_DOWN_PRESS
+        yield hid_report_event
+        yield VOL_DOWN_RELEASE
+        yield hid_report_event
+
+    def on_increase(self):
+        yield VOL_UP_PRESS
+        yield hid_report_event
+        yield VOL_UP_RELEASE
+        yield hid_report_event
diff --git a/kmk/firmware.py b/kmk/firmware.py
index 706b05c..7aaddb6 100644
--- a/kmk/firmware.py
+++ b/kmk/firmware.py
@@ -19,6 +19,9 @@ class Firmware:
         logger = logging.getLogger(__name__)
         logger.setLevel(log_level)
 
+        import kmk_keyboard_user
+        self.encoders = getattr(kmk_keyboard_user, 'encoders', [])
+
         self.hydrated = False
 
         self.store = Store(kmk_reducer, log_level=log_level)
@@ -58,3 +61,10 @@ class Firmware:
 
             if update:
                 self.store.dispatch(update)
+
+            for encoder in self.encoders:
+                eupdate = encoder.scan()
+
+                if eupdate:
+                    for event in eupdate:
+                        self.store.dispatch(event)
diff --git a/upy-unix-stubs/machine/__init__.py b/upy-unix-stubs/machine/__init__.py
index 20f4ebf..6199bc0 100644
--- a/upy-unix-stubs/machine/__init__.py
+++ b/upy-unix-stubs/machine/__init__.py
@@ -11,9 +11,12 @@ class Anything:
     def __repr__(self):
         return 'Anything<{}>'.format(self.name)
 
+    def init(self, *args, **kwargs):
+        pass
+
     @property
     def value(self):
-        return None
+        return False
 
 
 class Passthrough:
@@ -23,6 +26,10 @@ class Passthrough:
 
 class Pin:
     board = Passthrough()
+    IN = 'IN'
+    OUT = 'OUT'
+    PULL_DOWN = 'PULL_DOWN'
+    PULL_UP = 'PULL_UP'
 
     def __call__(self, *args, **kwargs):
         return self.board
diff --git a/user_keymaps/klardotsh/itsybitsy_m4_express/threethree.py b/user_keymaps/klardotsh/itsybitsy_m4_express/threethree.py
index 74f945e..148a2f5 100644
--- a/user_keymaps/klardotsh/itsybitsy_m4_express/threethree.py
+++ b/user_keymaps/klardotsh/itsybitsy_m4_express/threethree.py
@@ -1,5 +1,6 @@
 from kmk.common.consts import DiodeOrientation, UnicodeModes
 from kmk.common.keycodes import KC
+from kmk.common.macros.rotary_encoder import VolumeRotaryEncoder
 from kmk.common.macros.simple import send_string, simple_key_sequence
 from kmk.common.macros.unicode import unicode_string_sequence
 from kmk.common.pins import Pin as P
@@ -15,6 +16,10 @@ rows = (P.D12, P.D11, P.D10)
 diode_orientation = DiodeOrientation.COLUMNS
 unicode_mode = UnicodeModes.LINUX
 
+encoders = [
+    VolumeRotaryEncoder(P.A3, P.A2),
+]
+
 emoticons = AttrDict({
     # Emojis
     'BEER': r'🍺',