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esp-weatherstation
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pressure compensation

main
Hendrik Langer 5 years ago
parent
eb4a13a205
commit
af9793636c
1 changed files with 2 additions and 2 deletions
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  1. 4
      src/main.cpp

4
src/main.cpp
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@ -80,7 +80,7 @@ static constexpr uint8_t GEIGER_PIN = D6;
static constexpr float CONV_FACTOR = 0.008120; static constexpr float CONV_FACTOR = 0.008120;
static constexpr float OWN_BACKGROUND_CPS = 0.2; // documentation says 0.2 (make sure value doesn't get negative if subtracting!) static constexpr float OWN_BACKGROUND_CPS = 0.2; // documentation says 0.2 (make sure value doesn't get negative if subtracting!)
static constexpr float HEIGHT = 142; static constexpr float HEIGHT = 135;
#ifndef EXTERNAL_POWER #ifndef EXTERNAL_POWER
ADC_MODE(ADC_VCC); ADC_MODE(ADC_VCC);
@ -157,7 +157,7 @@ void ICACHE_FLASH_ATTR getValuesJSON(char* buffer, const size_t buf_len, int for
// https://de.wikipedia.org/wiki/Barometrische_H%C3%B6henformel#Reduktion_auf_Meeresh%C3%B6he // https://de.wikipedia.org/wiki/Barometrische_H%C3%B6henformel#Reduktion_auf_Meeresh%C3%B6he
// https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/ // https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/
float absolute_humidity = (6.112*exp((17.67*sd.temperature)/(sd.temperature+243.5))*(sd.humidity/100)*18.02)/((273.15+sd.temperature)*1000*0.08314); float absolute_humidity = (6.112*exp((17.67*sd.temperature)/(sd.temperature+243.5))*(sd.humidity/100)*18.02)/((273.15+sd.temperature)*1000*0.08314);
float pressure_compensation_factor = exp((9.80665/(287.05*(sd.temperature+273.15+0.12*(((absolute_humidity*461.5*(sd.temperature+273.15))/100)/100)+0.0065*(HEIGHT/2))))*HEIGHT); float pressure_compensation_factor = exp((9.80665/(287.05*(sd.temperature+273.15+0.12*((absolute_humidity*461.5*(sd.temperature+273.15)/100)/100)+0.0065*(HEIGHT/2))))*HEIGHT);
if (format == 1) { if (format == 1) {
JsonArray array = jsonDoc.to<JsonArray>(); JsonArray array = jsonDoc.to<JsonArray>();

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