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Fix DHT11 temperature calculation for temperature below 0°C.

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Renaud
2025-02-04 13:20:11 +08:00
parent efd5cd28c7
commit 6f4e46a36f
4 changed files with 17 additions and 20 deletions
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docs/32_errata.html
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@@ -196,13 +196,11 @@ And retest after the following modification.
dht11_tempc = values[ 2] ;
dht11_tempf = values[ 3] ;
if( dht11_tempf & 0x80) {
dht11_tempc *= -1 ;
dht11_tempf = 10 - ( dht11_tempf & 0x7F) ;
if( dht11_tempf == 10) {
dht11_tempc -= 1 ;
dht11_tempf = 0 ;
}
dht11_tempc = -( dht11_tempc + 1) ;
dht11_tempf ^= 0x80 ;
}
dht11_deciC = dht11_tempc * 10 + dht11_tempf ;
</pre>
<h2>Stability</h2>
@@ -239,6 +237,6 @@ or how bad the measurements are.
<a href="33_ds18b20.html">Next</a>, I will use another digital thermometer as a
reference.
<hr>© 2020-2024 Renaud Fivet
<hr>© 2020-2025 Renaud Fivet
</body>
</html>