polymachine/b-parasite-esp32
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First draft for Photoresistor

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the code now should setup and use the photoresistor and read it's value by the adc.
the returned value is 0 just as a place holder until the correct values are measured.
This commit is contained in:
chentadot 2021-07-05 21:59:39 +03:00 • committed by rbaron
parent 64b2bcc6c6
commit c9b05859e4
4 changed files with 47 additions and 1 deletions
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4
code/b-parasite/config/prst_config.h
View file

@ -6,6 +6,10 @@
// Built-in LED.
#define PRST_LED_PIN NRF_GPIO_PIN_MAP(0, 28)
// Photo Sensor
#define PRST_PHOTO_V NRF_GPIO_PIN_MAP(1, 11)
#define PRST_PHOTO_OUT NRF_GPIO_PIN_MAP(0, 2)
// Deep sleep.
#define PRST_DEEP_SLEEP_IN_SECONDS 300

7
code/b-parasite/src/main.c
View file

@ -62,8 +62,13 @@ static void rtc_callback() {
prst_adc_soil_moisture_t soil_read = prst_adc_soil_read(batt_read.voltage);
prst_pwm_stop();
nrf_gpio_pin_clear(PRST_FAST_DISCH_PIN);
nrf_gpio_pin_set(PRST_PHOTO_V); // set GPIO for photoresistor HIGH
prst_adc_photo_sensor prst_adc_photo_read(double battery_voltage); // read PHOTO SENSOR value
nrf_gpio_pin_clear(PRST_PHOTO_V); // not sure need this one
prst_ble_update_adv_data(batt_read.millivolts, temp_humi.temp_millicelcius,
temp_humi.humidity, soil_read.relative, run_counter);
temp_humi.humidity, soil_read.relative, prst_adc_photo_sensor.lux, run_counter);
prst_adv_start();
nrf_delay_ms(PRST_BLE_ADV_TIME_IN_MS);
prst_adv_stop();

29
code/b-parasite/src/prst/adc.c
View file

@ -17,6 +17,9 @@
#define PRST_ADC_SOIL_INPUT NRF_SAADC_INPUT_AIN1
#define PRST_ADC_SOIL_CHANNEL 1
#define PRST_ADC_PHOTO_INPUT NRF_SAADC_INPUT_AIN0
#define PRST_ADC_PHOTO_CHANNEL 2
static nrf_saadc_value_t sample_adc_channel(uint8_t channel) {
nrf_saadc_value_t result;
// *WARNING* this function is blocking, which is ot ideal but okay, but it
@ -64,6 +67,12 @@ void prst_adc_init() {
APP_ERROR_CHECK(
nrf_drv_saadc_channel_init(PRST_ADC_SOIL_CHANNEL, &soil_channel_config));
nrf_saadc_channel_config_t photo_channel_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(PRST_ADC_PHOTO_INPUT);
APP_ERROR_CHECK(
nrf_drv_saadc_channel_init(PRST_ADC_PHOTO_CHANNEL, &photo_channel_config));
}
prst_adc_batt_read_t prst_adc_batt_read() {
@ -118,5 +127,25 @@ prst_adc_soil_moisture_t prst_adc_soil_read(double battery_voltage) {
" %% (percentage); %u (relative)",
ret.raw, NRF_LOG_FLOAT(percentage * 100), ret.relative);
#endif
return ret;
}
static inline double get_lux_level(double battery_voltage, nrf_saadc_value_t raw_adc_output) {
const double x = battery_voltage;
// todo: add DEBUG lines
return 0; // place holder. need to map values to lux level.
}
prst_adc_photo_sensor prst_adc_photo_read(double battery_voltage) {
nrf_saadc_value_t raw_adc_output = sample_adc_channel(PRST_ADC_PHOTO_CHANNEL);
const uint16_t lux = get_lux_level(battery_voltage, raw_adc_output);
prst_adc_photo_sensor ret;
ret.raw = raw_adc_output;
ret.lux = lux;
// todo: add DEBUG lines
return ret;
}

8
code/b-parasite/src/prst/adc.h
View file

@ -16,10 +16,18 @@ typedef struct prst_adc_soil_moisture {
double percentage;
} prst_adc_soil_moisture_t;
typedef struct prst_adc_photo_sensor {
int16_t raw;
// Should check minimum and maximum values
uint16_t lux;
} prst_adc_photo_sensor;
void prst_adc_init();
prst_adc_batt_read_t prst_adc_batt_read();
prst_adc_soil_moisture_t prst_adc_soil_read(double battery_voltage);
prst_adc_photo_sensor prst_adc_photo_read(double battery_voltage);
#endif // _PRST_ADC_H_