Change humidity normalization function to something more tested

thgeorgiou · thgeorgiou · commit 0b4aacc10a56 · 2017-11-29T11:57:28.000+02:00
diff --git a/src/hackair.cpp b/src/hackair.cpp
@@ -179,7 +179,9 @@ void hackAIR::turnOff() {
     }
 }
 
+// Normalization function written by Zbyszek Kiliański, Piotr Paul
+// https://github.com/piotrkpaul/esp8266-sds011
 void humidityCompensation(hackAirData &data, float humidity) {
-    data.pm25 = data.pm25 / (3.72f * (1 + 7 * (humidity / 100.0f)));
-    data.pm10 = data.pm10 / (3.72f * (1 + 7 * (humidity / 100.0f)));
+  data.pm25 = data.pm25 / (1.0 + 0.48756 * pow((humidity / 100.0), 8.60068));
+  data.pm10 = data.pm10 / (1.0 + 0.81559 * pow((humidity / 100.0), 5.83411));
 }

Original file line number	Diff line number	Diff line change
`@@ -179,7 +179,9 @@ void hackAIR::turnOff() {`
`179`	`179`	`}`
`180`	`180`	`}`
`181`	`181`
	`182`	`+// Normalization function written by Zbyszek Kiliański, Piotr Paul`
	`183`	`+// https://github.com/piotrkpaul/esp8266-sds011`
`182`	`184`	`void humidityCompensation(hackAirData &data, float humidity) {`
`183`		`- data.pm25 = data.pm25 / (3.72f * (1 + 7 * (humidity / 100.0f)));`
`184`		`- data.pm10 = data.pm10 / (3.72f * (1 + 7 * (humidity / 100.0f)));`
	`185`	`+ data.pm25 = data.pm25 / (1.0 + 0.48756 * pow((humidity / 100.0), 8.60068));`
	`186`	`+ data.pm10 = data.pm10 / (1.0 + 0.81559 * pow((humidity / 100.0), 5.83411));`
`185`	`187`	`}`