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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();
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