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diff --git a/apps/Sensor Watch Starter Project/app.c b/apps/Sensor Watch Starter Project/app.c
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+#include <stdio.h>
+#include <string.h>
+#include "watch.h"
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// This section sets up types and storage for our application state.
+// You can tear this out and replace it with whatever you want.
+typedef enum ApplicationMode {
+    MODE_HELLO = 0,
+    MODE_THERE
+} ApplicationMode;
+
+typedef enum LightColor {
+    COLOR_RED = 0,
+    COLOR_GREEN,
+    COLOR_YELLOW
+} LightColor;
+
+typedef struct ApplicationState {
+    ApplicationMode mode;
+    LightColor color;
+    bool light_on;
+    uint8_t wake_count;
+    bool enter_deep_sleep;
+} ApplicationState;
+
+ApplicationState application_state;
+
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// This section defines the callbacks for our button press events (implemented at bottom).
+// Add any other callbacks you may need either here or in another file.
+void cb_light_pressed();
+void cb_mode_pressed();
+void cb_alarm_pressed();
+
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// This section contains the required functions for any watch app. You should tear out
+// all the code in these functions when writing your app, but you must implement all
+// of the functions, even if they are empty stubs. You can also replace the documentation
+// lines with documentation that describes what your functions do!
+
+/**
+ * @brief the app_init function is called before anything else. Use it to set up any
+ * internal data structures or application state required by your app.
+ */
+void app_init() {
+    memset(&application_state, 0, sizeof(application_state));
+}
+
+/**
+ * @brief the app_wake_from_deep_sleep function is only called if your app is waking from
+ * the ultra-low power BACKUP sleep mode. You may have chosen to store some state in the
+ * RTC's backup registers prior to entering this mode. You may restore that state here.
+ *
+ * @see watch_enter_deep_sleep()
+ */
+void app_wake_from_deep_sleep() {
+    // retrieve our application state from the backup registers
+    application_state.mode = (ApplicationMode)watch_get_backup_data(0);
+    application_state.color = (LightColor)watch_get_backup_data(1);
+    application_state.wake_count = (uint8_t)watch_get_backup_data(2) + 1;
+}
+
+/**
+ * @brief the app_setup function is like setup() in Arduino. It is called once when the
+ * program begins. You should set pin modes and enable any peripherals you want to
+ * set up (real-time clock, I2C, etc.) Depending on your application, you may or may not
+ * want to configure sensors on your sensor board here. For example, a low-power
+ * accelerometer that will run at all times should be configured here, whereas you may
+ * want to enable a more power-hungry environmental sensor only when you need it.
+ *
+ * @note If your app enters the ultra-low power BACKUP sleep mode, this function will
+ * be called again when it wakes from that deep sleep state. In this state, the RTC will
+ * still be configured with the correct date and time.
+ */
+void app_setup() {
+    watch_enable_leds();
+
+    watch_enable_external_interrupts();
+    // This starter app demonstrates three different ways of using the button interrupts.
+    // The BTN_MODE interrupt only triggers on a rising edge, so the mode changes once per press.
+    watch_register_interrupt_callback(BTN_MODE, cb_mode_pressed, INTERRUPT_TRIGGER_RISING);
+    // The BTN_LIGHT interrupt triggers on both rising and falling edges. The callback then checks
+    // the pin state when triggered: on a button down event, it increments the color and turns the
+    // LED on, whereas on a button up event, it turns the light off.
+    watch_register_interrupt_callback(BTN_LIGHT, cb_light_pressed, INTERRUPT_TRIGGER_BOTH);
+    // The BTN_ALARM callback is on an external wake pin; we can avoid using the EIC for this pin
+    // by using the extwake interrupt — but note that it can only trigger on either a rising or
+    // a falling edge, not both.
+    watch_register_extwake_callback(BTN_ALARM, cb_alarm_pressed, true);
+
+    watch_enable_display();
+}
+
+/**
+ * @brief the app_prepare_for_sleep function is called before the watch goes into the
+ * STANDBY sleep mode. In STANDBY mode, most peripherals are shut down, and no code
+ * will run until the watch receives an interrupt (generally either the 1Hz tick or
+ * a press on one of the buttons).
+ */
+void app_prepare_for_sleep() {
+}
+
+/**
+ * @brief the app_wake_from_sleep function is called after the watch wakes from the
+ * STANDBY sleep mode.
+ */
+void app_wake_from_sleep() {
+    application_state.wake_count++;
+}
+
+/**
+ * @brief the app_loop function is called once on app startup and then again each time
+ * the watch STANDBY sleep mode.
+ */
+bool app_loop() {
+    // set the LED to a color
+    if (application_state.light_on) {
+        switch (application_state.color) {
+            case COLOR_RED:
+                watch_set_led_red();
+                break;
+            case COLOR_GREEN:
+                watch_set_led_green();
+                break;
+            case COLOR_YELLOW:
+                watch_set_led_yellow();
+                break;
+        }
+    } else {
+        watch_set_led_off();
+    }
+
+    // Display the number of times we've woken up (modulo 32 to fit in 2 digits at top right)
+    char buf[3] = {0};
+    sprintf(buf, "%2d", application_state.wake_count % 32);
+    watch_display_string(buf, 2);
+
+    // display "Hello there" text
+    switch (application_state.mode) {
+        case MODE_HELLO:
+            watch_display_string("Hello", 5);
+            break;
+        case MODE_THERE:
+            watch_display_string("there", 5);
+            break;
+    }
+
+    if (application_state.enter_deep_sleep) {
+        application_state.enter_deep_sleep = false;
+
+        // stash our application state in the backup registers
+        watch_store_backup_data((uint32_t)application_state.mode, 0);
+        watch_store_backup_data((uint32_t)application_state.color, 1);
+        watch_store_backup_data((uint32_t)application_state.wake_count, 2);
+
+        // turn off the LED
+        watch_set_led_off();
+
+        // wait a moment for the user's finger to be off the button
+        delay_ms(1000);
+
+        // nap time :)
+        watch_enter_deep_sleep();
+    }
+
+    return true;
+}
+
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// Implementations for our callback functions. Replace these with whatever functionality
+// your app requires.
+void cb_light_pressed() {
+    // always turn the light off when the pin goes low
+    if (watch_get_pin_level(BTN_LIGHT) == 0) {
+        application_state.light_on = false;
+        return;
+    }
+    application_state.color = (application_state.color + 1) % 3;
+    application_state.light_on = true;
+}
+
+void cb_mode_pressed() {
+    application_state.mode = (application_state.mode + 1) % 2;
+}
+
+void cb_alarm_pressed() {
+    // boo: http://ww1.microchip.com/downloads/en/DeviceDoc/SAM_L22_Family_Errata_DS80000782B.pdf
+    // Reference 15010. doesn't say it applies to PA02 but it seems it does?
+    // anyway can't deep sleep now :(
+    // application_state.enter_deep_sleep = true;
+}