soil_sensor.h

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#ifndef SOIL_SENSOR_H
#define SOIL_SENSOR_H
 
#include "driver/gpio.h"
#include "esp_err.h"
#include "general/adc.h"
 
#define SOIL_CALIB_DRY_MV 2700 // air
#define SOIL_CALIB_WET_MV 1100 // water
#define ADC_SAMPLE_NUM    10   // set higher lower depending on prio (current draw vs smooth values)
 
typedef struct
{
    adc_channel_t channel_pin;
    gpio_num_t power_pin;
    uint8_t percentage; // output goes here
 
    adc_sensor _adc; // set by init
} soil_sensor;
 
esp_err_t soil_sensor_init(soil_sensor* sensor);
 
esp_err_t soil_sensor_read(soil_sensor* sensor);
 
#endif