diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
new file mode 100644
index 0000000..55565a0
--- /dev/null
+++ b/.devcontainer/Dockerfile
@@ -0,0 +1,50 @@
+FROM ubuntu:22.10
+
+# TODO: install emscripten (https://emscripten.org/docs/getting_started/downloads.html)
+
+# TODO: Clean this up once buildkit is supported gracefully in devcontainers
+# https://github.com/microsoft/vscode-remote-release/issues/1409
+
+ARG X86_64_TOOLCHAIN_FILENAME="gcc-arm-none-eabi-10.3-2021.07-x86_64-linux.tar.bz2"
+ARG X86_64_TOOLCHAIN="https://developer.arm.com/-/media/Files/downloads/gnu-rm/10.3-2021.07/gcc-arm-none-eabi-10.3-2021.07-x86_64-linux.tar.bz2"
+ARG X86_64_TOOLCHAIN_CHECKSUM="b56ae639d9183c340f065ae114a30202"
+
+ARG AARCH64_TOOLCHAIN_FILENAME="gcc-arm-none-eabi-10.3-2021.07-aarch64-linux.tar.bz2"
+ARG AARCH64_TOOLCHAIN="https://developer.arm.com/-/media/Files/downloads/gnu-rm/10.3-2021.07/gcc-arm-none-eabi-10.3-2021.07-aarch64-linux.tar.bz2"
+ARG AARCH64_TOOLCHAIN_CHECKSUM="c20b0535d01f8d4418341d893c62a782"
+
+WORKDIR /setup
+
+# Install required packages
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+    # make is used as the build system
+    make \
+    # git is used for fetching submodules & interactive development
+    git \
+    # bzip2 is required to extract the Arm toolchain
+    bzip2 \
+    # ca certs need to be available for fetching git submodules
+    ca-certificates \
+    # python is used to convert binaries to uf2 files
+    python3 python-is-python3
+
+# Download and verify both x86-64 and aarch64 toolchains. This is unfortunate and
+# slows down the build, but it's a clean-ish option until buildkit can be used.
+ADD $X86_64_TOOLCHAIN $X86_64_TOOLCHAIN_FILENAME
+ADD $AARCH64_TOOLCHAIN $AARCH64_TOOLCHAIN_FILENAME
+
+RUN echo "${X86_64_TOOLCHAIN_CHECKSUM} ${X86_64_TOOLCHAIN_FILENAME}" | md5sum --check
+RUN echo "${AARCH64_TOOLCHAIN_CHECKSUM} ${AARCH64_TOOLCHAIN_FILENAME}" | md5sum --check
+
+# Extract toolchain directly into /usr
+RUN /bin/sh -c 'set -ex && \
+    ARCH=`uname -m` && \
+    if [ "$ARCH" = "x86_64" ]; then \
+       tar --strip-components=1 -C /usr -xjf $X86_64_TOOLCHAIN_FILENAME ; \
+    else \
+       tar --strip-components=1 -C /usr -xjf $AARCH64_TOOLCHAIN_FILENAME ; \
+    fi'
+
+RUN rm $X86_64_TOOLCHAIN_FILENAME
+RUN rm $AARCH64_TOOLCHAIN_FILENAME
\ No newline at end of file
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..a71a0f2
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,17 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.231.6/containers/docker-existing-dockerfile
+{
+    "name": "GNU Arm Embedded Environment",
+    // Sets the run context to one level up instead of the .devcontainer folder.
+    "context": "..",
+    // Set the location of the dockerfile to use
+    "dockerFile": "Dockerfile",
+    // Set *default* container specific settings.json values on container create.
+    "settings": {},
+    // Add the IDs of extensions you want installed when the container is created.
+    "extensions": [
+        "ms-vscode.cpptools"
+    ]
+    // Uncomment to connect as a non-root user if you've added one. See https://aka.ms/vscode-remote/containers/non-root.
+    // "remoteUser": "vscode"
+}
\ No newline at end of file
diff --git a/apps/functional-test/app.c b/apps/functional-test/app.c
index b4ee041..179bea8 100644
--- a/apps/functional-test/app.c
+++ b/apps/functional-test/app.c
@@ -2,15 +2,6 @@
 #include <string.h>
 #include "watch.h"
 
-bool even = false;
-bool beep = false;
-uint32_t i = 0;
-
-static void cb_tick(void) {
-    beep = true;
-    even = !even;
-}
-
 void app_init(void) {
 }
 
@@ -22,30 +13,14 @@ void app_setup(void) {
 
     watch_enable_buzzer();
 
-    watch_enable_digital_output(A0);
-    watch_enable_digital_output(SCL);
-    watch_enable_digital_output(SDA);
-    watch_enable_digital_output(A1);
-    watch_enable_digital_output(A2);
-    watch_enable_digital_output(A3);
-    watch_enable_digital_output(A4);
-
+    watch_enable_digital_output(RED);
+    watch_enable_digital_output(GREEN);
     watch_enable_digital_input(BTN_ALARM);
     watch_enable_digital_input(BTN_LIGHT);
     watch_enable_digital_input(BTN_MODE);
     watch_enable_pull_down(BTN_ALARM);
     watch_enable_pull_down(BTN_LIGHT);
     watch_enable_pull_down(BTN_MODE);
-
-    watch_set_pin_level(A0, false);
-    watch_set_pin_level(SCL, false);
-    watch_set_pin_level(SDA, false);
-    watch_set_pin_level(A1, false);
-    watch_set_pin_level(A2, false);
-    watch_set_pin_level(A3, false);
-    watch_set_pin_level(A4, false);
-
-    watch_rtc_register_periodic_callback(cb_tick, 2);
 }
 
 void app_prepare_for_standby(void) {
@@ -55,51 +30,44 @@ void app_wake_from_standby(void) {
 }
 
 bool app_loop(void) {
-    char buf[14];
+    static int last_button = 0;
+    static int button = 0;
+    static int8_t loop = 0;
 
-    if (beep) watch_buzzer_play_note(BUZZER_NOTE_E5, 100);
-
-    if (even) {
-        printf("Flashing even lights\n");
-        #ifdef WATCH_SWAP_LED_PINS
-        sprintf(buf, "WT%2d'blu_E", (uint8_t)(i++ % 40));
-        #else
-        sprintf(buf, "WT%2d'Grn_E", (uint8_t)(i++ % 40));
-        #endif
-        watch_set_led_green();
-        watch_set_pin_level(A0, true);
-        watch_set_pin_level(SCL, false);
-        watch_set_pin_level(SDA, true);
-        watch_set_pin_level(A1, false);
-        watch_set_pin_level(A2, true);
-        watch_set_pin_level(A3, false);
-        watch_set_pin_level(A4, true);
-    } else {
-        printf("Flashing odd lights\n");
-        sprintf(buf, "WT%2d-red~O", (uint8_t)(i++ % 40));
-        watch_display_string(buf, 0);
-        watch_set_led_red();
-        watch_set_pin_level(A0, false);
-        watch_set_pin_level(SCL, true);
-        watch_set_pin_level(SDA, false);
-        watch_set_pin_level(A1, true);
-        watch_set_pin_level(A2, false);
-        watch_set_pin_level(A3, true);
-        watch_set_pin_level(A4, false);
-    }
+    watch_set_pin_level(GREEN, false);
+    watch_set_pin_level(RED, false);
     if (watch_get_pin_level(BTN_ALARM)) {
-        buf[2] = 'a';
-        buf[3] = 'L';
+        watch_set_pin_level(GREEN, true);
+        button = 1;
+    } else if (watch_get_pin_level(BTN_LIGHT)) {
+        watch_set_pin_level(RED, true);
+        button = 2;
+    } else if (watch_get_pin_level(BTN_MODE)) {
+        watch_set_pin_level(GREEN, true);
+        watch_set_pin_level(RED, true);
+        button = 3;
     }
-    if (watch_get_pin_level(BTN_LIGHT)) {
-        buf[2] = '1';
-        buf[3] = 'i';
-    }
-    if (watch_get_pin_level(BTN_MODE)) {
-        buf[2] = '-';
-        buf[3] = 'O';
-    }
-    watch_display_string(buf, 0);
 
-    return true;
+    if (button != last_button) {
+        last_button = button;
+        watch_buzzer_play_note(BUZZER_NOTE_C8, 100);
+    }
+
+    static const bool segmap[3][24] = {
+       //0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
+        {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0},
+        {0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 1},
+        {1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1}
+    };
+
+    for(int com = 0; com < 3; com++) {
+        for(int seg = 0; seg < 24; seg++) {
+            if (segmap[com][seg]) (loop >= 0) ? watch_set_pixel(com, seg) : watch_clear_pixel(com, seg);
+            else (loop < 0) ? watch_set_pixel(com, seg) : watch_clear_pixel(com, seg);
+        }
+    }
+
+    loop++;
+
+    return false;
 }
diff --git a/apps/sensor-board-test/app.c b/apps/sensor-board-test/app.c
new file mode 100644
index 0000000..d7da190
--- /dev/null
+++ b/apps/sensor-board-test/app.c
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <string.h>
+#include "watch.h"
+
+bool even = false;
+
+static void cb_tick(void) {
+    even = !even;
+}
+
+void app_init(void) {
+}
+
+void app_wake_from_backup(void) {
+}
+
+void app_setup(void) {
+    watch_enable_digital_output(RED);
+    watch_enable_digital_output(GREEN);
+    watch_enable_digital_output(A0);
+    watch_enable_digital_output(SCL);
+    watch_enable_digital_output(SDA);
+    watch_enable_digital_output(A1);
+    watch_enable_digital_output(A2);
+    watch_enable_digital_output(A3);
+    watch_enable_digital_output(A4);
+
+    watch_set_pin_level(A0, false);
+    watch_set_pin_level(SCL, false);
+    watch_set_pin_level(SDA, false);
+    watch_set_pin_level(A1, false);
+    watch_set_pin_level(A2, false);
+    watch_set_pin_level(A3, false);
+    watch_set_pin_level(A4, false);
+
+    watch_rtc_register_periodic_callback(cb_tick, 2);
+}
+
+void app_prepare_for_standby(void) {
+}
+
+void app_wake_from_standby(void) {
+}
+
+bool app_loop(void) {
+    watch_date_time date_time = watch_rtc_get_date_time();
+    char buf[16];
+    sprintf(buf, "%2d:%02d:%02d: ", date_time.unit.hour, date_time.unit.minute, date_time.unit.second);
+    printf(buf);
+    if (even) {
+        printf("Even\n");
+        watch_set_pin_level(RED, false);
+        watch_set_pin_level(GREEN, true);
+        watch_set_pin_level(A0, true);
+        watch_set_pin_level(SCL, false);
+        watch_set_pin_level(SDA, true);
+        watch_set_pin_level(A1, false);
+        watch_set_pin_level(A2, true);
+        watch_set_pin_level(A3, false);
+        watch_set_pin_level(A4, true);
+    } else {
+        printf("Odd\n");
+        watch_set_pin_level(RED, true);
+        watch_set_pin_level(GREEN, false);
+        watch_set_pin_level(A0, false);
+        watch_set_pin_level(SCL, true);
+        watch_set_pin_level(SDA, false);
+        watch_set_pin_level(A1, true);
+        watch_set_pin_level(A2, false);
+        watch_set_pin_level(A3, true);
+        watch_set_pin_level(A4, false);
+    }
+
+    return true;
+}
diff --git a/apps/sensor-board-test/make/Makefile b/apps/sensor-board-test/make/Makefile
new file mode 100755
index 0000000..c66ad20
--- /dev/null
+++ b/apps/sensor-board-test/make/Makefile
@@ -0,0 +1,10 @@
+TOP = ../../..
+include $(TOP)/make.mk
+
+INCLUDES += \
+  -I../
+
+SRCS += \
+  ../app.c
+
+include $(TOP)/rules.mk
diff --git a/make.mk b/make.mk
index 07c6933..0792e64 100644
--- a/make.mk
+++ b/make.mk
@@ -9,17 +9,43 @@ endif
 ##############################################################################
 .PHONY: all directory clean size
 
+# OS detection, adapted from https://gist.github.com/sighingnow/deee806603ec9274fd47
+DETECTED_OS :=
+ifeq ($(OS),Windows_NT)
+  DETECTED_OS = WINDOWS
+else
+  UNAME_S := $(shell uname -s)
+  ifeq ($(UNAME_S),Linux)
+    DETECTED_OS = LINUX
+  endif
+  ifeq ($(UNAME_S),Darwin)
+    DETECTED_OS = OSX
+  endif
+endif
+$(if ${VERBOSE},$(info OS detected: $(DETECTED_OS)))
+
 ifeq ($(OS), Windows_NT)
   MKDIR = gmkdir
 else
   MKDIR = mkdir
 endif
 
+ifeq ($(DETECTED_OS), LINUX)
+  MAKEFLAGS += -j `nproc`
+endif
+ifeq ($(DETECTED_OS), OSX)
+  NPROCS = $(shell sysctl hw.ncpu  | grep -o '[0-9]\+')
+  MAKEFLAGS += -j $(NPROCS)
+endif
+ifeq ($(DETECTED_OS), WINDOWS)
+  MAKEFLAGS += -j $(NUMBER_OF_PROCESSORS)
+endif
+
 ifndef EMSCRIPTEN
 CC = arm-none-eabi-gcc
 OBJCOPY = arm-none-eabi-objcopy
 SIZE = arm-none-eabi-size
-UF2 = python $(TOP)/utils/uf2conv.py
+UF2 = python3 $(TOP)/utils/uf2conv.py
 
 CFLAGS += -W -Wall -Wextra -Wmissing-prototypes -Wmissing-declarations
 CFLAGS += --std=gnu99 -Os
diff --git a/movement/alt_fw/focus.h b/movement/alt_fw/focus.h
index 865459e..ab5525a 100644
--- a/movement/alt_fw/focus.h
+++ b/movement/alt_fw/focus.h
@@ -32,6 +32,7 @@ const watch_face_t watch_faces[] = {
     tomato_face,
     stopwatch_face,
     countdown_face,
+    wake_face, // added by @joshber 2022-07-23, per @joeycastillo
 
     preferences_face,
     set_time_face,
diff --git a/movement/alt_fw/timers.h b/movement/alt_fw/timers.h
new file mode 100644
index 0000000..c4d27f5
--- /dev/null
+++ b/movement/alt_fw/timers.h
@@ -0,0 +1,43 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef MOVEMENT_CONFIG_H_
+#define MOVEMENT_CONFIG_H_
+
+#include "movement_faces.h"
+
+const watch_face_t watch_faces[] = {
+    simple_clock_face,
+    wake_face,
+    interval_face,
+    stopwatch_face,
+    sunrise_sunset_face,
+
+    preferences_face,
+    set_time_face,
+};
+
+#define MOVEMENT_NUM_FACES (sizeof(watch_faces) / sizeof(watch_face_t))
+
+#endif // MOVEMENT_CONFIG_H_
diff --git a/movement/make/Makefile b/movement/make/Makefile
index 1c880fc..05f3636 100755
--- a/movement/make/Makefile
+++ b/movement/make/Makefile
@@ -65,6 +65,9 @@ SRCS += \
   ../watch_faces/complication/orrery_face.c \
   ../watch_faces/complication/astronomy_face.c \
   ../watch_faces/complication/tomato_face.c \
+  ../watch_faces/complication/probability_face.c \
+  ../watch_faces/complication/wake_face.c \
+# wake_face.c: Josh Berson, 2022-07-04
 # New watch faces go above this line.
 
 # Leave this line at the bottom of the file; it has all the targets for making your project.
diff --git a/movement/movement.c b/movement/movement.c
index 3444a37..d79142e 100644
--- a/movement/movement.c
+++ b/movement/movement.c
@@ -226,6 +226,11 @@ void movement_cancel_background_task(void) {
     movement_state.has_scheduled_background_task = other_tasks_scheduled;
 }
 
+void movement_request_wake() {
+    movement_state.needs_wake = true;
+    _movement_reset_inactivity_countdown();
+}
+
 void movement_play_signal(void) {
     watch_buzzer_play_note(BUZZER_NOTE_C8, 75);
     watch_buzzer_play_note(BUZZER_NOTE_REST, 100);
@@ -233,7 +238,11 @@ void movement_play_signal(void) {
 }
 
 void movement_play_alarm(void) {
-    movement_state.alarm_ticks = 128 * 5 - 80; // 80 ticks short of 5 seconds, or 4.375 seconds (our beep is 0.375 seconds)
+    movement_request_wake();
+    // alarm length: 75 ticks short of 5 seconds, or 4.414 seconds:
+    // our tone is 0.375 seconds of beep and 0.625 of silence, repeated five times.
+    // so 4.375 + a few ticks to wake up from sleep mode.
+    movement_state.alarm_ticks = 128 * 5 - 75;
     _movement_enable_fast_tick_if_needed();
 }
 
@@ -325,6 +334,23 @@ void app_prepare_for_standby(void) {
 void app_wake_from_standby(void) {
 }
 
+static void _sleep_mode_app_loop(void) {
+    movement_state.needs_wake = false;
+    // as long as le_mode_ticks is -1 (i.e. we are in low energy mode), we wake up here, update the screen, and go right back to sleep.
+    while (movement_state.le_mode_ticks == -1) {
+        // we also have to handle background tasks here in the mini-runloop
+        if (movement_state.needs_background_tasks_handled) _movement_handle_background_tasks();
+
+        event.event_type = EVENT_LOW_ENERGY_UPDATE;
+        watch_faces[movement_state.current_watch_face].loop(event, &movement_state.settings, watch_face_contexts[movement_state.current_watch_face]);
+
+        // if we need to wake immediately, do it!
+        if (movement_state.needs_wake) return;
+        // otherwise enter sleep mode, and when the extwake handler is called, it will reset le_mode_ticks and force us out at the next loop.
+        else watch_enter_sleep_mode();
+    }
+}
+
 bool app_loop(void) {
     if (movement_state.watch_face_changed) {
         if (movement_state.settings.bit.button_should_sound) {
@@ -366,17 +392,10 @@ bool app_loop(void) {
         event.event_type = EVENT_NONE;
         event.subsecond = 0;
 
-        // this is a little mini-runloop.
-        // as long as le_mode_ticks is -1 (i.e. we are in low energy mode), we wake up here, update the screen, and go right back to sleep.
-        while (movement_state.le_mode_ticks == -1) {
-            // we also have to handle background tasks here in the mini-runloop
-            if (movement_state.needs_background_tasks_handled) _movement_handle_background_tasks();
-
-            event.event_type = EVENT_LOW_ENERGY_UPDATE;
-            watch_faces[movement_state.current_watch_face].loop(event, &movement_state.settings, watch_face_contexts[movement_state.current_watch_face]);
-            watch_enter_sleep_mode();
-        }
-        // as soon as le_mode_ticks is reset by the extwake handler, we bail out of the loop and reactivate ourselves.
+        // _sleep_mode_app_loop takes over at this point and loops until le_mode_ticks is reset by the extwake handler,
+        // or wake is requested using the movement_request_wake function.
+        _sleep_mode_app_loop();
+        // as soon as _sleep_mode_app_loop returns, we reactivate ourselves.
         event.event_type = EVENT_ACTIVATE;
         // this is a hack tho: waking from sleep mode, app_setup does get called, but it happens before we have reset our ticks.
         // need to figure out if there's a better heuristic for determining how we woke up.
diff --git a/movement/movement.h b/movement/movement.h
index a29c446..0442f60 100644
--- a/movement/movement.h
+++ b/movement/movement.h
@@ -257,6 +257,7 @@ typedef struct {
     // background task handling
     bool needs_background_tasks_handled;
     bool has_scheduled_background_task;
+    bool needs_wake;
 
     // low energy mode countdown
     int32_t le_mode_ticks;
@@ -287,6 +288,8 @@ void movement_schedule_background_task(watch_date_time date_time);
 // movement will associate the scheduled task with the currently active face.
 void movement_cancel_background_task(void);
 
+void movement_request_wake(void);
+
 void movement_play_signal(void);
 void movement_play_alarm(void);
 
diff --git a/movement/movement_faces.h b/movement/movement_faces.h
index e7e78ff..e18f368 100644
--- a/movement/movement_faces.h
+++ b/movement/movement_faces.h
@@ -52,6 +52,9 @@
 #include "orrery_face.h"
 #include "astronomy_face.h"
 #include "tomato_face.h"
+#include "probability_face.h"
+#include "wake_face.h"
+// #include "interval_face.h"
 // New includes go above this line.
 
 #endif // MOVEMENT_FACES_H_
diff --git a/movement/watch_faces/complication/probability_face.c b/movement/watch_faces/complication/probability_face.c
new file mode 100644
index 0000000..7b056b3
--- /dev/null
+++ b/movement/watch_faces/complication/probability_face.c
@@ -0,0 +1,182 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Spencer Bywater
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+// Emulator only: need time() to seed the random number generator.
+#if __EMSCRIPTEN__
+#include <time.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include "probability_face.h"
+
+#define DEFAULT_DICE_SIDES 2
+#define PROBABILITY_ANIMATION_TICK_FREQUENCY 8
+const uint16_t NUM_DICE_TYPES = 8; // Keep this consistent with # of dice types below
+const uint16_t DICE_TYPES[] = {2, 4, 6, 8, 10, 12, 20, 100};
+
+
+// --------------
+// Custom methods
+// --------------
+
+static void display_dice_roll(probability_state_t *state) {
+    char buf[8];
+    if (state->rolled_value == 0) {
+        if (state->dice_sides == 100) {
+            sprintf(buf, " C    ");
+        } else {
+            sprintf(buf, "%2d    ", state->dice_sides);
+        }
+    } else if (state->dice_sides == 2) {
+        if (state->rolled_value == 1) {
+            sprintf(buf, "%2d   H", state->dice_sides);
+        } else {
+            sprintf(buf, "%2d   T", state->dice_sides);
+        }
+    } else if (state->dice_sides == 100) {
+        sprintf(buf, " C %3d", state->rolled_value);
+    } else {
+        sprintf(buf, "%2d %3d", state->dice_sides, state->rolled_value);
+    }
+    watch_display_string(buf, 4);
+}
+
+static void generate_random_number(probability_state_t *state) {
+    // Emulator: use rand. Hardware: use arc4random.
+    #if __EMSCRIPTEN__
+    state->rolled_value = rand() % state->dice_sides + 1;
+    #else
+    state->rolled_value = arc4random_uniform(state->dice_sides) + 1;
+    #endif
+}
+
+static void display_dice_roll_animation(probability_state_t *state) {
+    if (state->is_rolling) {
+        if (state->animation_frame == 0) {
+            watch_display_string("   ", 7);
+            watch_set_pixel(1, 4);
+            watch_set_pixel(1, 6);
+            state->animation_frame = 1;
+        } else if (state->animation_frame == 1) {
+            watch_clear_pixel(1, 4);
+            watch_clear_pixel(1, 6);
+            watch_set_pixel(2, 4);
+            watch_set_pixel(0, 6);
+            state->animation_frame = 2;
+        } else if (state->animation_frame == 2) {
+            watch_clear_pixel(2, 4);
+            watch_clear_pixel(0, 6);
+            watch_set_pixel(2, 5);
+            watch_set_pixel(0, 5);
+            state->animation_frame = 3;
+        } else if (state->animation_frame == 3) {
+            state->animation_frame = 0;
+            state->is_rolling = false;
+            movement_request_tick_frequency(1);
+            display_dice_roll(state);
+        }
+    }
+}
+
+
+// ---------------------------
+// Standard watch face methods
+// ---------------------------
+void probability_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
+    (void) settings;
+    (void) watch_face_index;
+    if (*context_ptr == NULL) {
+        *context_ptr = malloc(sizeof(probability_state_t));
+        memset(*context_ptr, 0, sizeof(probability_state_t));
+    }
+    // Emulator only: Seed random number generator
+    #if __EMSCRIPTEN__
+    srand(time(NULL));
+    #endif
+}
+
+void probability_face_activate(movement_settings_t *settings, void *context) {
+    (void) settings;
+    probability_state_t *state = (probability_state_t *)context;
+
+    state->dice_sides = DEFAULT_DICE_SIDES;
+    state->rolled_value = 0;
+    watch_display_string("PR", 0);
+}
+
+bool probability_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
+    (void) settings;
+    probability_state_t *state = (probability_state_t *)context;
+
+    if (state->is_rolling && event.event_type != EVENT_TICK) {
+        return true;
+    }
+
+    switch (event.event_type) {
+        case EVENT_ACTIVATE:
+            display_dice_roll(state);
+            break;
+        case EVENT_TICK:
+            display_dice_roll_animation(state);
+            break;
+        case EVENT_MODE_BUTTON_UP:
+            movement_move_to_next_face();
+            break;
+        case EVENT_LIGHT_BUTTON_UP:
+            // Change how many sides the die has
+            for (int i = 0; i < NUM_DICE_TYPES; i++) {
+                if (DICE_TYPES[i] == state->dice_sides) {
+                    if (i == NUM_DICE_TYPES - 1) {
+                        state->dice_sides = DICE_TYPES[0];
+                    } else {
+                        state->dice_sides = DICE_TYPES[i + 1];
+                    }
+                    break;
+                }
+            }
+            state->rolled_value = 0;
+            display_dice_roll(state);
+            break;
+        case EVENT_ALARM_BUTTON_UP:
+            // Roll the die
+            generate_random_number(state);
+            state->is_rolling = true;
+            // Dice rolling animation begins on next tick and new roll will be displayed on completion
+            movement_request_tick_frequency(PROBABILITY_ANIMATION_TICK_FREQUENCY);
+            break;
+        case EVENT_LOW_ENERGY_UPDATE:
+            watch_display_string("SLEEP ", 4);
+            break;
+        default:
+            break;
+    }
+
+    return true;
+}
+
+void probability_face_resign(movement_settings_t *settings, void *context) {
+    (void) settings;
+    (void) context;
+}
diff --git a/movement/watch_faces/complication/probability_face.h b/movement/watch_faces/complication/probability_face.h
new file mode 100644
index 0000000..c6d3638
--- /dev/null
+++ b/movement/watch_faces/complication/probability_face.h
@@ -0,0 +1,51 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Spencer Bywater
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef PROBABILITY_FACE_H_
+#define PROBABILITY_FACE_H_
+
+#include "movement.h"
+
+typedef struct {
+    uint8_t dice_sides;
+    uint8_t rolled_value;
+    uint8_t animation_frame;
+    bool is_rolling;
+} probability_state_t;
+
+void probability_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void probability_face_activate(movement_settings_t *settings, void *context);
+bool probability_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void probability_face_resign(movement_settings_t *settings, void *context);
+
+#define probability_face ((const watch_face_t){ \
+    probability_face_setup, \
+    probability_face_activate, \
+    probability_face_loop, \
+    probability_face_resign, \
+    NULL, \
+})
+
+#endif // PROBABILITY_FACE_H_
+
diff --git a/movement/watch_faces/complication/wake_face.c b/movement/watch_faces/complication/wake_face.c
new file mode 100644
index 0000000..4c265c7
--- /dev/null
+++ b/movement/watch_faces/complication/wake_face.c
@@ -0,0 +1,159 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Josh Berson, building on Wesley Ellis’ countdown_face.c
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+//-----------------------------------------------------------------------------
+
+#include <stdlib.h>
+#include <string.h>
+// #include <threads.h>
+
+#include "wake_face.h"
+#include "watch.h"
+#include "watch_utility.h"
+
+/*
+    UI Notes
+    º Light advances hour by 1
+    º Light long press advances hour by 6
+    º Alarm advances minute by 10
+    º Alarm long press cycles through signal modes (just one at the moment)
+*/
+
+//
+// Private
+//
+
+static
+void _wake_face_update_display(movement_settings_t *settings, wake_face_state_t *state) {
+    (void) settings;
+    uint8_t hour = state->hour;
+
+    watch_clear_display();
+    if ( settings->bit.clock_mode_24h )
+        watch_set_indicator(WATCH_INDICATOR_24H);
+    else {
+        if ( hour >= 12 )
+            watch_set_indicator(WATCH_INDICATOR_PM);
+        hour = hour % 12 ? hour % 12 : 12;
+    }
+
+    if ( state->mode )
+        watch_set_indicator(WATCH_INDICATOR_BELL);
+
+    static char lcdbuf[11];
+    sprintf(lcdbuf, "WA  %2d%02d  ", hour, state->minute);
+
+    watch_set_colon();
+    watch_display_string(lcdbuf, 0);
+}
+
+//
+// Exported
+//
+
+void wake_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void **context_ptr) {
+    (void) settings;
+    (void) watch_face_index;
+
+    if (*context_ptr == NULL) {
+        *context_ptr = malloc(sizeof(wake_face_state_t));
+        wake_face_state_t *state = (wake_face_state_t *)*context_ptr;
+        memset(*context_ptr, 0, sizeof(wake_face_state_t));
+
+        state->hour = 5;
+        state->minute = 0;
+        state->mode = 0;
+    }
+}
+
+void wake_face_activate(movement_settings_t *settings, void *context) {
+    (void) settings;
+    (void) context;
+}
+void wake_face_resign(movement_settings_t *settings, void *context) {
+    (void) settings;
+    (void) context;
+}
+
+bool wake_face_wants_background_task(movement_settings_t *settings, void *context) {
+    (void) settings;
+    wake_face_state_t *state = (wake_face_state_t *)context;
+
+    bool rc = false;
+    if ( state->mode ) {
+        watch_date_time now = watch_rtc_get_date_time();
+        rc = state->hour==now.unit.hour && state->minute==now.unit.minute;
+        // We’re at the mercy of the wants_background_task handler
+        // In Safari, the emulator triggers at the ›end‹ of the minute
+        // Converting to Unix timestamps and taking a difference between now and wake
+        // is not an easy win — because the timestamp for wake has to rely on now
+        // for its date. So first we’d have to see if the TOD of wake is after that
+        // of now. If it is, take tomorrow’s date, calculating month and year rollover
+        // if need be.
+    }
+    return rc;
+}
+
+bool wake_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
+    (void) settings;
+    wake_face_state_t *state = (wake_face_state_t *)context;
+
+    switch (event.event_type) {
+    case EVENT_ACTIVATE:
+    case EVENT_TICK:
+        _wake_face_update_display(settings, state);
+        break;
+    case EVENT_LIGHT_BUTTON_UP:
+        state->hour = (state->hour + 1) % 24;
+        _wake_face_update_display(settings, state);
+        break;
+    case EVENT_LIGHT_LONG_PRESS:
+        state->hour = (state->hour + 6) % 24;
+        _wake_face_update_display(settings, state);
+        break;
+    case EVENT_ALARM_BUTTON_UP:
+        state->minute = (state->minute + 10) % 60;
+        _wake_face_update_display(settings, state);
+        break;
+    case EVENT_ALARM_LONG_PRESS:
+        state->mode ^= 1;
+        _wake_face_update_display(settings, state);
+        break;
+    case EVENT_BACKGROUND_TASK:
+        movement_play_alarm();
+            // 2022-07-23: Thx @joeycastillo for the dedicated “alarm” signal
+        break;
+    case EVENT_MODE_BUTTON_UP:
+        movement_move_to_next_face();
+        break;
+    case EVENT_TIMEOUT:
+        movement_move_to_face(0);
+        break;
+    case EVENT_LOW_ENERGY_UPDATE:
+    default:
+      break;
+    }
+
+    return true;
+}
\ No newline at end of file
diff --git a/movement/watch_faces/complication/wake_face.h b/movement/watch_faces/complication/wake_face.h
new file mode 100644
index 0000000..c091c8f
--- /dev/null
+++ b/movement/watch_faces/complication/wake_face.h
@@ -0,0 +1,53 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Josh Berson
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+//-----------------------------------------------------------------------------
+
+#ifndef WAKE_FACE_H_
+#define WAKE_FACE_H_
+
+#include "movement.h"
+
+typedef struct {
+    uint32_t hour : 5;
+    uint32_t minute : 6;
+    uint32_t mode : 1;
+} wake_face_state_t;
+
+void wake_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void **context_ptr);
+void wake_face_activate(movement_settings_t *settings, void *context);
+bool wake_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void wake_face_resign(movement_settings_t *settings, void *context);
+bool wake_face_wants_background_task(movement_settings_t *settings, void *context);
+
+#define wake_face ((const watch_face_t){ \
+    wake_face_setup, \
+    wake_face_activate, \
+    wake_face_loop, \
+    wake_face_resign, \
+    wake_face_wants_background_task \
+})
+
+#endif // WAKE_FACE_H_
+
diff --git a/rules.mk b/rules.mk
index 2f2f392..8de3fc1 100644
--- a/rules.mk
+++ b/rules.mk
@@ -7,9 +7,9 @@ SUBMODULES = tinyusb
 COBRA = cobra -f
 
 ifndef EMSCRIPTEN
-all: directory $(SUBMODULES) $(BUILD)/$(BIN).elf $(BUILD)/$(BIN).hex $(BUILD)/$(BIN).bin $(BUILD)/$(BIN).uf2 size
+all: $(BUILD)/$(BIN).elf $(BUILD)/$(BIN).hex $(BUILD)/$(BIN).bin $(BUILD)/$(BIN).uf2 size
 else
-all: directory $(SUBMODULES) $(BUILD)/$(BIN).html
+all: $(BUILD)/$(BIN).html
 endif
 
 $(BUILD)/$(BIN).html: $(OBJS)
@@ -35,13 +35,14 @@ $(BUILD)/$(BIN).uf2: $(BUILD)/$(BIN).bin
 	@echo UF2CONV $@
 	@$(UF2) $^ -co $@
 
+.phony: $(SUBMODULES)
 $(SUBMODULES):
 	git submodule update --init
 
 install:
 	@$(UF2) -D $(BUILD)/$(BIN).uf2
 
-%.o:
+$(BUILD)/%.o: | $(SUBMODULES) directory
 	@echo CC $@
 	@$(CC) $(CFLAGS) $(filter %/$(subst .o,.c,$(notdir $@)), $(SRCS)) -c -o $@
 
@@ -59,4 +60,6 @@ clean:
 analyze:
 	@$(COBRA) basic $(INCLUDES) $(DEFINES) $(SRCS)
 
--include $(wildcard $(BUILD)/*.d)
+DEPFILES := $(SRCS:%.c=$(BUILD)/%.d)
+
+-include $(wildcard $(DEPFILES))
diff --git a/watch-library/hardware/watch/watch_private.c b/watch-library/hardware/watch/watch_private.c
index a197e52..cd607b8 100644
--- a/watch-library/hardware/watch/watch_private.c
+++ b/watch-library/hardware/watch/watch_private.c
@@ -142,7 +142,7 @@ void _watch_enable_tcc(void) {
     #endif
     // The buzzer will set the period depending on the tone it wants to play, but we have to set some period here to
     // get the LED working. Almost any period will do, tho it should be below 20000 (i.e. 50 Hz) to avoid flickering.
-    hri_tcc_write_PER_reg(TCC0, 4096);
+    hri_tcc_write_PER_reg(TCC0, 1024);
     // Set the duty cycle of all pins to 0: LED's off, buzzer not buzzing.
     hri_tcc_write_CC_reg(TCC0, WATCH_BUZZER_TCC_CHANNEL, 0);
     hri_tcc_write_CC_reg(TCC0, WATCH_RED_TCC_CHANNEL, 0);