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Fix float literals and implicit conversions #213

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Fix float literals and implicit conversions #213

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1c58e68
Fix float literals and implicit conversions
da-phil Jun 2, 2024
dd4cacb
Use correct float version of expensive math operations
da-phil Jun 2, 2024
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60 changes: 30 additions & 30 deletions DHT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -90,18 +90,18 @@ float DHT::readTemperature(bool S, bool force) {
case DHT11:
f = data[2];
if (data[3] & 0x80) {
f = -1 - f;
f = -1.F - f;
}
f += (data[3] & 0x0f) * 0.1;
f += (data[3] & 0x0f) * 0.1F;
if (S) {
f = convertCtoF(f);
}
break;
case DHT12:
f = data[2];
f += (data[3] & 0x0f) * 0.1;
f += (data[3] & 0x0f) * 0.1F;
if (data[2] & 0x80) {
f *= -1;
f *= -1.F;
}
if (S) {
f = convertCtoF(f);
Expand All @@ -110,9 +110,9 @@ float DHT::readTemperature(bool S, bool force) {
case DHT22:
case DHT21:
f = ((word)(data[2] & 0x7F)) << 8 | data[3];
f *= 0.1;
f *= 0.1F;
if (data[2] & 0x80) {
f *= -1;
f *= -1.F;
}
if (S) {
f = convertCtoF(f);
Expand All @@ -129,15 +129,15 @@ float DHT::readTemperature(bool S, bool force) {
* value in Celcius
* @return float value in Fahrenheit
*/
float DHT::convertCtoF(float c) { return c * 1.8 + 32; }
float DHT::convertCtoF(float c) { return c * 1.8F + 32.F; }

/*!
* @brief Converts Fahrenheit to Celcius
* @param f
* value in Fahrenheit
* @return float value in Celcius
*/
float DHT::convertFtoC(float f) { return (f - 32) * 0.55555; }
float DHT::convertFtoC(float f) { return (f - 32.F) * 0.55555F; }

/*!
* @brief Read Humidity
Expand All @@ -151,12 +151,12 @@ float DHT::readHumidity(bool force) {
switch (_type) {
case DHT11:
case DHT12:
f = data[0] + data[1] * 0.1;
f = data[0] + data[1] * 0.1F;
break;
case DHT22:
case DHT21:
f = ((word)data[0]) << 8 | data[1];
f *= 0.1;
f *= 0.1F;
break;
}
}
Expand Down Expand Up @@ -196,26 +196,26 @@ float DHT::computeHeatIndex(float temperature, float percentHumidity,
if (!isFahrenheit)
temperature = convertCtoF(temperature);

hi = 0.5 * (temperature + 61.0 + ((temperature - 68.0) * 1.2) +
(percentHumidity * 0.094));

if (hi > 79) {
hi = -42.379 + 2.04901523 * temperature + 10.14333127 * percentHumidity +
-0.22475541 * temperature * percentHumidity +
-0.00683783 * pow(temperature, 2) +
-0.05481717 * pow(percentHumidity, 2) +
0.00122874 * pow(temperature, 2) * percentHumidity +
0.00085282 * temperature * pow(percentHumidity, 2) +
-0.00000199 * pow(temperature, 2) * pow(percentHumidity, 2);

if ((percentHumidity < 13) && (temperature >= 80.0) &&
(temperature <= 112.0))
hi -= ((13.0 - percentHumidity) * 0.25) *
sqrt((17.0 - abs(temperature - 95.0)) * 0.05882);

else if ((percentHumidity > 85.0) && (temperature >= 80.0) &&
(temperature <= 87.0))
hi += ((percentHumidity - 85.0) * 0.1) * ((87.0 - temperature) * 0.2);
hi = 0.5F * (temperature + 61.0F + ((temperature - 68.0F) * 1.2F) +
(percentHumidity * 0.094F));

if (hi > 79.F) {
hi = -42.379F + 2.04901523F * temperature + 10.14333127F * percentHumidity +
-0.22475541F * temperature * percentHumidity +
-0.00683783F * powf(temperature, 2.F) +
-0.05481717F * powf(percentHumidity, 2.F) +
0.00122874F * powf(temperature, 2.F) * percentHumidity +
0.00085282F * temperature * powf(percentHumidity, 2.F) +
-0.00000199F * powf(temperature, 2.F) * powf(percentHumidity, 2.F);

if ((percentHumidity < 13.F) && (temperature >= 80.0F) &&
(temperature <= 112.0F))
hi -= ((13.0F - percentHumidity) * 0.25F) *
sqrtf((17.0F - abs(temperature - 95.0F)) * 0.05882F);

else if ((percentHumidity > 85.0F) && (temperature >= 80.0F) &&
(temperature <= 87.0F))
hi += ((percentHumidity - 85.0F) * 0.1F) * ((87.0F - temperature) * 0.2F);
}

return isFahrenheit ? hi : convertFtoC(hi);
Expand Down
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