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150 lines
5.0 KiB
C++
150 lines
5.0 KiB
C++
#pragma once
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//
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// FILE: temperature.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.7
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// DATE: 2015-03-29
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// PURPOSE: collection temperature functions
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// URL: https://github.com/RobTillaart/Temperature
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#include "Arduino.h"
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#define TEMPERATURE_LIB_VERSION (F("0.3.7"))
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#define TEMPERATURE_VERSION (F("0.3.7")) // obsolete in 0.4.0
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float Fahrenheit(float celsius);
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float Celsius(float Fahrenheit);
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float Kelvin(float celsius);
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// reference:
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// [1] https://wahiduddin.net/calc/density_algorithms.htm
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// [2] https://web.archive.org/web/20100528030817/https://www.colorado.edu/geography/weather_station/Geog_site/about.htm
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// dewPoint function based on code of [2]
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// calculation of the saturation vapour pressure part is based upon NOAA ESGG(temp)
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float dewPoint(float celsius, float humidity);
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// dewPointFast() is > 5x faster than dewPoint() - run dewpoint_test.ino
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// delta mdewPointFastax with dewPoint() - run dewpoint_test.ino ==> ~0.347
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// (earlier version mentions ~0.6544 but that test code is gone :(
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// http://en.wikipedia.org/wiki/Dew_point
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float dewPointFast(float celsius, float humidity);
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// https://en.wikipedia.org/wiki/Humidex
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float humidex(float celsius, float dewPoint);
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// 0.3.0 => https://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml
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// previous https://en.wikipedia.org/wiki/Heat_index
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// TF = temp in Fahrenheit
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// RH = relative humidity in %
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float heatIndex(float TF, float RH);
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// 0.3.0 => https://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml
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// previous https://en.wikipedia.org/wiki/Heat_index
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// TC = temp in Celsius
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// RH = relative humidity in %
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float heatIndexC(float TC, float RH);
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// https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/
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// Absolute Humidity (grams/m3) = 6.112 × e^[(17.67 × T)/(T+243.5)] × rh × 2.1674
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// -----------------------------------------------
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// (273.15+T)
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float absoluteHumidity(float Celsius, float relHumidity);
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// https://en.wikipedia.org/wiki/Wind_chill
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// US = Fahrenheit / miles / hour
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// METRIC = Celsius / meter / hour (sec)
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// wind speed @ 10 meter,
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// if convert is true => wind speed will be converted to 1.5 meter
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// else ==> formula assumes wind speed @ 1.5 meter
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// US
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float WindChill_F_mph(const float Fahrenheit, const float milesPerHour, const bool convert = true);
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// METRIC - standard wind chill formula for Environment Canada
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float WindChill_C_kmph(const float Celsius, const float kilometerPerHour, const bool convert = true);
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float WindChill_C_mps(const float Celsius, const float meterPerSecond, const bool convert = true);
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// https://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html
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// Does not have the temperature correction ==> it has almost the -5.257 exponent
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// https://www.omnicalculator.com/physics/air-pressure-at-altitude
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// similar to https://en.wikipedia.org/wiki/Barometric_formula
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//
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// Note: altitude in meters.
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float baroToSeaLevelC( float pressure, float celsius, float altitude);
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// https://www.omnicalculator.com/physics/air-pressure-at-altitude
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// temperature (Celsius) at altitude (meter)
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float seaLevelToAltitude( float pressureSeaLevel, float celsius, float altitude);
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float altitudeToSeaLevel( float pressure, float celsius, float altitude);
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// https://en.wikipedia.org/wiki/High-altitude_cooking
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// temperature at which water cooks
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// 1 feet = 0.3048 meter
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float boilingFahrenheit(float feet); // feet = 0..15000
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float boilingCelsius(float meter); // meter = 0..4500
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// inverse function
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// Celsius = 80°..100°
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float boilingMeter(float Celsius);
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///////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// TEMPERATURE CONVERTER CLASS
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//
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class temperatureConverter
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{
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// used Celsius as internal unit, to minimize math
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public:
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temperatureConverter() { _temp = 0; };
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void setKelvin(float value = 0) { _temp = value - 273.15; };
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void setCelsius(float value = 0) { _temp = value; };
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void setFahrenheit(float value = 0) { _temp = (value - 32.0) / 1.8; };
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void setReamur(float value = 0) { _temp = value * 1.25; };
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void setRankine(float value = 0) { _temp = (value - 491.67) / 1.8; };
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void setDelisle(float value = 0) { _temp = (value + 100) / 1.5; };
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void setNewton(float value = 0) { _temp = value / 0.33; };
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void setRomer(float value = 0) { _temp = (value - 7.5) / 0.525; };
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float getKelvin() { return _temp + 273.15; };
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float getCelsius() { return _temp; };
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float getFahrenheit() { return _temp * 1.8 + 32; };
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float getReamur() { return _temp * 0.8; };
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float getRankine() { return _temp * 1.8 + 491.67; };
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float getDelisle() { return _temp * 1.5 - 100.0; };
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float getNewton() { return _temp * 0.33; };
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float getRomer() { return _temp * 0.525 + 7.5; };
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private:
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float _temp = 0;
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};
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// -- END OF FILE --
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