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Substitute pow(a,b) with exp(b*log(a)) to make it compatible with ESP… #15

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Substitute pow(a,b) with exp(b*log(a)) to make it compatible with ESP… #15

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10 changes: 8 additions & 2 deletions Adafruit_BMP085_U.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -368,7 +368,10 @@ float Adafruit_BMP085_Unified::pressureToAltitude(float seaLevel, float atmosphe
// at high altitude. See this thread for more information:
// http://forums.adafruit.com/viewtopic.php?f=22&t=58064

return 44330.0 * (1.0 - pow(atmospheric / seaLevel, 0.1903));
// return 44330.0 * (1.0 - pow(atmospheric / seaLevel, 0.1903));
// Pow is not compatible with ESP8266 Arduino IDE. This is a workaround
// See http://stackoverflow.com/questions/4985221/how-will-you-implement-powa-b-in-c-condition-follows
return 44330.0 * (1.0 - exp(0.1903 * log(atmospheric / seaLevel)));
}

/**************************************************************************/
Expand Down Expand Up @@ -410,7 +413,10 @@ float Adafruit_BMP085_Unified::seaLevelForAltitude(float altitude, float atmosph
// at high altitude. See this thread for more information:
// http://forums.adafruit.com/viewtopic.php?f=22&t=58064

return atmospheric / pow(1.0 - (altitude/44330.0), 5.255);
// return atmospheric / pow(1.0 - (altitude/44330.0), 5.255);
// Pow is not compatible with ESP8266 Arduino IDE. This is a workaround
// See http://stackoverflow.com/questions/4985221/how-will-you-implement-powa-b-in-c-condition-follows
return atmospheric / exp(5.255 * log(1.0 - (altitude/44330.0)));
}

/**************************************************************************/
Expand Down