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add beep and light to BME280 app

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This commit is contained in:
Joey Castillo 2021-08-14 19:20:42 -04:00
parent f172763bf2
commit 84e179de88
1 changed files with 35 additions and 5 deletions
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40
Sensor Watch BME280 Project/app.c
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@ -11,7 +11,9 @@ typedef enum ApplicationMode {
typedef struct ApplicationState {
ApplicationMode mode;
bool light_on;
int light_ticks;
bool led_on;
bool needs_beep;
uint16_t dig_T1;
int16_t dig_T2;
int16_t dig_T3;
@ -25,7 +27,7 @@ typedef struct ApplicationState {
ApplicationState application_state;
void cb_light_pressed();
void cb_mode_pressed();
void cb_tick();
@ -51,6 +53,10 @@ void app_wake_from_deep_sleep() {
void app_setup() {
watch_enable_buttons();
watch_register_button_callback(BTN_MODE, cb_mode_pressed);
watch_register_button_callback(BTN_LIGHT, cb_light_pressed);
watch_enable_buzzer();
watch_enable_led(false);
// pin A0 powers the sensor on this board.
watch_enable_digital_output(A0);
@ -104,6 +110,25 @@ bool app_loop() {
float humidity;
char buf[11] = {0};
if (application_state.needs_beep) {
watch_buzzer_play_note(BUZZER_NOTE_A6, 100);
application_state.needs_beep = false;
}
if (application_state.light_ticks > 0 && !application_state.led_on) {
watch_set_led_yellow();
application_state.led_on = true;
}
if (application_state.led_on && application_state.light_ticks == 0) {
if (watch_get_pin_level(BTN_LIGHT)) {
application_state.light_ticks = 3;
} else {
watch_set_led_off();
application_state.led_on = false;
}
}
switch (application_state.mode) {
case MODE_TEMPERATURE:
// take one reading
@ -169,11 +194,9 @@ float read_temperature(int32_t *p_t_fine) {
*/
float read_humidity(int32_t t_fine) {
int32_t adc_value = watch_i2c_read16(BME280_ADDRESS, BME280_REGISTER_HUMID_DATA);
// the sensor returns this as big-endian, so swap the bytes.
adc_value = (adc_value >> 8) | (adc_value << 8);
// again, cribbed from Adafruit's BME280 driver. they sell a great breakout board for this sensor!
int32_t v_x1_u32r = v_x1_u32r = (t_fine - ((int32_t)76800));
int32_t v_x1_u32r = (t_fine - ((int32_t)76800));
v_x1_u32r = (((((adc_value << 14) - (((int32_t)application_state.dig_H4) << 20) - (((int32_t)application_state.dig_H5) * v_x1_u32r)) +
((int32_t)16384)) >> 15) * (((((((v_x1_u32r * ((int32_t)application_state.dig_H6)) >> 10) * (((v_x1_u32r * ((int32_t)application_state.dig_H3)) >> 11) +
((int32_t)32768))) >> 10) + ((int32_t)2097152)) * ((int32_t)application_state.dig_H2) + 8192) >> 14));
@ -187,8 +210,15 @@ float read_humidity(int32_t t_fine) {
void cb_mode_pressed() {
application_state.mode = (application_state.mode + 1) % 3;
application_state.needs_beep = true;
}
void cb_tick() {
if (application_state.light_ticks > 0) {
application_state.light_ticks--;
}
}
void cb_light_pressed() {
application_state.light_ticks = 3;
}