SensorManager Class Reference

Collaboration diagram for SensorManager:

Public Member Functions
void	Init (Ads1115< 2 > *ads, Aht20 *aht, Bmp280 *bmp, CompGuiX *gui)
float	GetTemperature () const
float	GetLight () const
float	GetHumidity () const
float	GetCompensatedTemperature () const
float	GetPressure () const

Private Attributes
Aht20 *	aht_ = nullptr
Bmp280 *	bmp_ = nullptr
CompGuiX *	gui_ = nullptr
float	temperature_ = 0.0f
float	light_ = 0.0f
std::deque< float >	light_queue_

Detailed Description

Definition at line 15 of file sensor_manager.hpp.

Member Function Documentation

GetCompensatedTemperature()

float SensorManager::GetCompensatedTemperature ( ) const

inline

Definition at line 83 of file sensor_manager.hpp.

                                          {
    return aht_ ? aht_->GetTemperature() : 0.0f;
  }

GetHumidity()

float SensorManager::GetHumidity ( ) const

inline

Definition at line 80 of file sensor_manager.hpp.

{ return aht_ ? aht_->GetHumidity() : 0.0f; }

GetLight()

float SensorManager::GetLight ( ) const

inline

Definition at line 77 of file sensor_manager.hpp.

{ return light_; }

GetPressure()

float SensorManager::GetPressure ( ) const

inline

Definition at line 88 of file sensor_manager.hpp.

{ return bmp_ ? bmp_->ReadPressure() : 0.0f; }

GetTemperature()

float SensorManager::GetTemperature ( ) const

inline

Definition at line 74 of file sensor_manager.hpp.

{ return temperature_; }

Init()

void SensorManager::Init ( Ads1115< 2 > *  ads, Aht20 *  aht, Bmp280 *  bmp, CompGuiX *  gui  )

inline

Definition at line 18 of file sensor_manager.hpp.

                                                                     {
    aht_ = aht;
    bmp_ = bmp;
    gui_ = gui;
 
    // Register callback for channel 0: NTC thermistor (external temperature)
    ads->RegisterChannelCallback(0, [this](float voltage) {
      constexpr float VCC = 3.3f;         // Supply voltage
      constexpr float R_REF = 100000.0f;  // Reference resistor value (Ω)
      float r_ntc =
          R_REF * voltage / (VCC - voltage);  // Calculate NTC resistance
 
      // Steinhart-Hart approximation constants for thermistor
      constexpr float B = 3950.0f;    // B-value of thermistor
      constexpr float T0 = 298.15f;   // Reference temperature (Kelvin)
      constexpr float R0 = 10000.0f;  // Reference resistance at T0
 
      // Convert resistance to temperature in Celsius
      float temp = 1.0f / (1.0f / T0 + (1.0f / B) * log(r_ntc / R0)) - 273.15f;
      temperature_ = temp;
    });
 
    // Register callback for channel 1: Photodiode (ambient light sensor)
    ads->RegisterChannelCallback(1, [this](float voltage) {
      constexpr float VCC = 3.3f;
      constexpr float R_REF = 100000.0f;
      float r_photo =
          R_REF * voltage / (VCC - voltage);  // Calculate resistance
 
      // Empirical constants for light sensor calibration
      constexpr float K = 1500000.0f;
      constexpr float GAMMA = 1.5f;
      float lux = K / pow(r_photo, GAMMA);  // Convert resistance to lux
 
      // Maintain a moving average with a deque of last 50 readings
      light_queue_.push_front(lux);
      if (light_queue_.size() > 50) {
        float avg = 0.0f;
        for (auto l : light_queue_) avg += l;
        avg /= light_queue_.size();
        light_ = avg;
 
        // Reduce GUI update rate using a counter
        static int counter = 0;
        if (++counter > 5) {
          if (gui_) gui_->SetLight(static_cast<uint8_t>(light_ / 20 + 1));
          counter = 0;
        }
 
        // Keep the queue size within limit
        light_queue_.pop_back();
      }
    });
  }

Field Documentation

aht_

Aht20* SensorManager::aht_ = nullptr

private

Definition at line 92 of file sensor_manager.hpp.

bmp_

Bmp280* SensorManager::bmp_ = nullptr

private

Definition at line 93 of file sensor_manager.hpp.

gui_

CompGuiX* SensorManager::gui_ = nullptr

private

Definition at line 94 of file sensor_manager.hpp.

light_

float SensorManager::light_ = 0.0f

private

Definition at line 98 of file sensor_manager.hpp.

light_queue_

std::deque<float> SensorManager::light_queue_

private

Definition at line 101 of file sensor_manager.hpp.

temperature_

float SensorManager::temperature_ = 0.0f

private

Definition at line 97 of file sensor_manager.hpp.

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The documentation for this class was generated from the following file:

• src/controller/sensor_manager.hpp