Fixing DHT22 temperature measurement not correct (#1008)

ca709850 · Laurent Ellerbach · GitHub · 181c930c · ca709850
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src/devices/Dhtxx/Devices/Dht22.cs src/devices/Dhtxx/Devices/Dht22.cs +1 -1

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--- a/src/devices/Dhtxx/Devices/Dht22.cs
+++ b/src/devices/Dhtxx/Devices/Dht22.cs
@@ -29,7 +29,7 @@ namespace Iot.Device.DHTxx

        internal override Temperature GetTemperature(byte[] readBuff)
        {
-            var temp = (readBuff[2] & 0x7F) + readBuff[3] * 0.1;
+            var temp = ((readBuff[2] & 0x7F) * 256 + readBuff[3]) * 0.1;
            // if MSB = 1 we have negative temperature
            temp = ((readBuff[2] & 0x80) == 0 ? temp : -temp);