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[DHT22] modified interpretation of temperature values in byte 2 and 3, such that negative temperature values are handled correctly #223

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[DHT22] modified interpretation of temperature values in byte 2 and 3, such that negative temperature values are handled correctly #223

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7 changes: 7 additions & 0 deletions DHT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,7 @@ void DHT::begin(uint8_t usec) {
*/
float DHT::readTemperature(bool S, bool force) {
float f = NAN;
short s = 0;

if (read(force)) {
switch (_type) {
Expand All @@ -108,6 +109,12 @@ float DHT::readTemperature(bool S, bool force) {
}
break;
case DHT22:
s = ((short) data[2]) << 8 | data[3];
f = s * 0.1;
if (S) {
f = convertCtoF(f);
}
break;
case DHT21:
f = ((word)(data[2] & 0x7F)) << 8 | data[3];
f *= 0.1;
Expand Down