analog_reader.h

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#ifndef SENSESP_SENSORS_ANALOG_READER_H_
#define SENSESP_SENSORS_ANALOG_READER_H_
 
#include "sensesp.h"
 
#include <cmath>
 
#include "Arduino.h"
 
namespace sensesp {
 
class BaseAnalogReader {
 public:
  virtual ~BaseAnalogReader() = default;
 
  virtual float read() = 0;
};
 
class ESP32AnalogReader : public BaseAnalogReader {
 public:
  static constexpr float kDefaultMaxVoltage = 3300.;
 
 protected:
  int pin_;
  float max_voltage_;
 
 public:
  ESP32AnalogReader(int pin, float max_voltage = kDefaultMaxVoltage)
      : pin_{pin}, max_voltage_{max_voltage} {
    if (!(max_voltage > 0.) || !std::isfinite(max_voltage)) {
      max_voltage_ = kDefaultMaxVoltage;
      ESP_LOGE(__FILENAME__,
               "Invalid max_voltage %f mV; using the default %f mV instead",
               max_voltage, max_voltage_);
    }
  }
 
  float read() override { return analogReadMilliVolts(pin_) / max_voltage_; }
};
typedef ESP32AnalogReader AnalogReader;
 
}  // namespace sensesp
 
#endif