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select pow function

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gemu2015 2019-05-18 14:21:43 +02:00
parent 22a4410280
commit a866e610bd
1 changed files with 6 additions and 1 deletions
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7
sonoff/xsns_21_sgp30.ino
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@ -48,6 +48,9 @@ void sgp30_Init(void) {
} }
} }
//#define POW_FUNC pow
#define POW_FUNC FastPrecisePow
float sgp30_AbsoluteHumidity(float temperature, float humidity,char tempUnit) { float sgp30_AbsoluteHumidity(float temperature, float humidity,char tempUnit) {
//taken from https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/ //taken from https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/
//precision is about 0.1°C in range -30 to 35°C //precision is about 0.1°C in range -30 to 35°C
@ -66,7 +69,9 @@ float sgp30_AbsoluteHumidity(float temperature, float humidity,char tempUnit) {
temperature = (temperature - 32.0) * (5.0 / 9.0); /*conversion to [°C]*/ temperature = (temperature - 32.0) * (5.0 / 9.0); /*conversion to [°C]*/
} }
temp = pow(2.718281828, (17.67 * temperature) / (temperature + 243.5)); temp = POW_FUNC(2.718281828, (17.67 * temperature) / (temperature + 243.5));
//return (6.112 * temp * humidity * 2.1674) / (273.15 + temperature); //simplified version //return (6.112 * temp * humidity * 2.1674) / (273.15 + temperature); //simplified version
return (6.112 * temp * humidity * mw) / ((273.15 + temperature) * r); //long version return (6.112 * temp * humidity * mw) / ((273.15 + temperature) * r); //long version