Mathematical conversion functions for NTC thermistor temperature. More...

#include <cmath>
#include <cstdint>

Include dependency graph for ntc_conversion.hpp:

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Namespaces
namespace	NTC

namespace	NTC::Constants

Functions
bool	NTC::ConvertResistanceToTemperatureBeta (float resistance_ohms, float resistance_at_25c, float beta_value, float *temperature_celsius) noexcept
	Convert resistance to temperature using beta parameter.

bool	NTC::ConvertTemperatureToResistanceBeta (float temperature_celsius, float resistance_at_25c, float beta_value, float *resistance_ohms) noexcept
	Convert temperature to resistance using beta parameter.

bool	NTC::ConvertResistanceToTemperatureSteinhartHart (float resistance_ohms, float coeff_a, float coeff_b, float coeff_c, float *temperature_celsius) noexcept
	Convert resistance to temperature using Steinhart-Hart equation.

bool	NTC::ConvertTemperatureToResistanceSteinhartHart (float temperature_celsius, float coeff_a, float coeff_b, float coeff_c, float *resistance_ohms) noexcept
	Convert temperature to resistance using Steinhart-Hart equation.

bool	NTC::ConvertResistanceToTemperatureDefault (float resistance_ohms, float *temperature_celsius) noexcept
	Convert resistance to temperature using default Steinhart-Hart coefficients.

bool	NTC::ConvertTemperatureToResistanceDefault (float temperature_celsius, float *resistance_ohms) noexcept
	Convert temperature to resistance using default Steinhart-Hart coefficients.

bool	NTC::CalculateThermistorResistance (float voltage_thermistor, float reference_voltage, float series_resistance, float *resistance_ohms) noexcept
	Calculate thermistor resistance from voltage divider.

bool	NTC::CalculateThermistorVoltage (float resistance_ohms, float reference_voltage, float series_resistance, float *voltage_thermistor) noexcept
	Calculate voltage across thermistor from resistance.

bool	NTC::CalculateVoltageDividerRatio (float resistance_ohms, float series_resistance, float *ratio) noexcept
	Calculate voltage divider ratio.

bool	NTC::ValidateResistance (float resistance_ohms, float min_resistance, float max_resistance) noexcept
	Validate resistance value.

bool	NTC::ValidateTemperature (float temperature_celsius, float min_temperature, float max_temperature) noexcept
	Validate temperature value.

bool	NTC::ValidateVoltage (float voltage_volts, float min_voltage, float max_voltage) noexcept
	Validate voltage value.

bool	NTC::ValidateBetaValue (float beta_value) noexcept
	Validate beta value.

bool	NTC::ValidateSteinhartHartCoefficients (float coeff_a, float coeff_b, float coeff_c) noexcept
	Validate Steinhart-Hart coefficients.

bool	NTC::CalculateBetaValue (float temp1_celsius, float resistance1_ohms, float temp2_celsius, float resistance2_ohms, float *beta_value) noexcept
	Calculate beta value from two temperature-resistance pairs.

bool	NTC::CalculateSteinhartHartCoefficients (float temp1_celsius, float resistance1_ohms, float temp2_celsius, float resistance2_ohms, float temp3_celsius, float resistance3_ohms, float coeff_a, float coeff_b, float *coeff_c) noexcept
	Calculate Steinhart-Hart coefficients from three temperature-resistance pairs.

bool	NTC::CalculateTemperatureAccuracy (float resistance_ohms, float resistance_at_25c, float beta_value, float resistance_tolerance, float beta_tolerance, float *accuracy_celsius) noexcept
	Worst-case temperature error from the R25 and B tolerances.

bool	NTC::CalculateTemperatureAccuracy (float resistance_ohms, float resistance_tolerance, float beta_tolerance, float *accuracy_celsius) noexcept
	Temperature error estimate for the default part (R25 = 10 kOhm, B = 3435 K)

bool	NTC::CalculateOptimalSeriesResistance (float thermistor_resistance_at_25c, float beta_value, float min_temperature, float max_temperature, float *optimal_resistance) noexcept
	Calculate optimal series resistance for voltage divider.

bool	NTC::CalculateOptimalSeriesResistance (float thermistor_resistance_at_25c, float min_temperature, float max_temperature, float *optimal_resistance) noexcept
	Optimal series resistance assuming B = 3435 K.

Variables
constexpr float	NTC::Constants::ABSOLUTE_ZERO_CELSIUS_ = -273.15F
	Absolute zero in Celsius.

constexpr float	NTC::Constants::KELVIN_OFFSET_
	Celsius to Kelvin conversion offset.

constexpr float	NTC::Constants::REFERENCE_TEMPERATURE_C_
	Reference temperature (25°C)

constexpr float	NTC::Constants::STEINHART_HART_A_
	Steinhart-Hart coefficient A (1/K)

constexpr float	NTC::Constants::STEINHART_HART_B_
	Steinhart-Hart coefficient B (1/K)

constexpr float	NTC::Constants::STEINHART_HART_C_
	Steinhart-Hart coefficient C (1/K)

constexpr float	NTC::Constants::MIN_RESISTANCE_OHMS_
	Minimum valid resistance (ohms)

constexpr float	NTC::Constants::MAX_RESISTANCE_OHMS_
	Maximum valid resistance (ohms)

constexpr float	NTC::Constants::MIN_TEMPERATURE_CELSIUS_
	Minimum valid temperature (°C)

constexpr float	NTC::Constants::MAX_TEMPERATURE_CELSIUS_
	Maximum valid temperature (°C)

constexpr float	NTC::Constants::MIN_BETA_VALUE_ = 1000.0F
	Minimum valid beta value (K)

constexpr float	NTC::Constants::MAX_BETA_VALUE_ = 5000.0F
	Maximum valid beta value (K)

constexpr float	NTC::Constants::EPSILON_FLOAT_ = 1e-6F
	Float comparison epsilon.

constexpr float	NTC::Constants::EPSILON_DOUBLE_ = 1e-12F
	Double precision epsilon.

constexpr float	NTC::Constants::ONE_FLOAT_ = 1.0F
	One as float.

constexpr float	NTC::Constants::ZERO_FLOAT_ = 0.0F
	Zero as float.

constexpr uint32_t	NTC::Constants::MILLISECONDS_PER_SECOND_
	Milliseconds per second.

constexpr float	NTC::Constants::CELSIUS_TO_FAHRENHEIT_MULTIPLIER_
	Celsius to Fahrenheit multiplier.

constexpr float	NTC::Constants::FAHRENHEIT_OFFSET_ = 32.0F
	Fahrenheit offset.

constexpr float	NTC::Constants::FAHRENHEIT_TO_CELSIUS_MULTIPLIER_
	Fahrenheit to Celsius multiplier.

Detailed Description

Mathematical conversion functions for NTC thermistor temperature.

Namespaces

Functions

Variables

Detailed Description