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diff --git a/apps/Sensor Watch BME280 Project/app.h b/apps/Sensor Watch BME280 Project/app.h
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+++ b/apps/Sensor Watch BME280 Project/app.h
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+// Sensor Watch: Hiking Log Demo App
+// This app displays a clock and temperature data from a BME280 temperature and humidiity sensor.
+// It also logs up to 36 hours of temperature data for playback.
+// You can use this app on backcountry treks: take the watch off at night and place it outside your tent.
+// It will log overnight low temperatures for review in the morning and optional transfer to your notepad.
+
+#define MAX_DATA_POINTS 36
+
+typedef enum ApplicationMode {
+    MODE_CLOCK = 0, // Displays month, day and current time.
+    MODE_TEMP,      // (TE) Displays temperature and an optional humidity reading (0-10 representing 0-100%)
+    MODE_LOG,       // (LO) Plays back temperature data (temperature in seconds slot)
+    MODE_PREFS,     // (PR) Allows setting options for the application
+    MODE_SET,       // (ST) Set time and date
+    NUM_MODES       // Last item in the enum, it's the number of cases.
+} ApplicationMode;
+
+typedef struct SensorReading {
+    bool is_valid;
+    uint8_t hour;
+    int8_t temperature;
+} SensorReading;
+
+typedef struct ApplicationState {
+    // Internal application state
+    ApplicationMode mode;   // Current mode
+    bool mode_changed;      // Lets us perform one-time setup for a given mode
+    uint16_t mode_ticks;    // Timeout for the mode (returns to clock after timeout expires)
+    uint8_t light_ticks;    // Timeout for the light
+    bool led_on;            // Indicates that the LED is on
+    uint8_t page;           // Tracks the current page in log, prefs or settings.
+    bool is_fahrenheit;     // User preference, C or F
+
+    // Data logging
+    SensorReading logged_data[MAX_DATA_POINTS];
+
+    // User preference
+    bool show_humidity;     // Indicates that the LED is on
+
+    // BME280 calibration values
+    uint16_t dig_T1;
+    int16_t dig_T2;
+    int16_t dig_T3;
+    uint8_t dig_H1;
+    int16_t dig_H2;
+    uint8_t dig_H3;
+    int16_t dig_H4;
+    int16_t dig_H5;
+    int8_t dig_H6;
+} ApplicationState;
+
+float read_temperature(int32_t *p_t_fine);
+float read_humidity(int32_t t_fine);
+
+void log_data();
+
+void do_clock_mode();
+
+void do_temp_mode();
+void temp_mode_handle_primary_button();
+
+void do_log_mode();
+void log_mode_handle_primary_button();
+
+void do_prefs_mode();
+void prefs_mode_handle_primary_button();
+void prefs_mode_handle_secondary_button();
+
+void do_set_time_mode();
+void set_time_mode_handle_primary_button();
+void set_time_mode_handle_secondary_button();
+
+void cb_light_pressed();
+void cb_mode_pressed();
+void cb_alarm_pressed();
+void cb_tick();