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MAX31855: fix sign of readReferenceTemperature function #17

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Merged
merged 2 commits into from
Jun 21, 2024
Merged

MAX31855: fix sign of readReferenceTemperature function #17

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e916c9c
Update MAX31855.cpp
kolaha99 Jun 18, 2024
fe1f729
Update MAX31855.cpp
kolaha99 Jun 19, 2024
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4 changes: 2 additions & 2 deletions src/utility/THERMOCOUPLE/MAX31855.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -208,15 +208,15 @@ float MAX31855Class::readReferenceTemperature(int type)

// The cold junction reference temperature is stored in the first 11 word's bits
// sent by the Thermocouple-to-Digital Converter
rawword = rawword & 0x7FF;
rawword = rawword & 0xFFF;
// check sign bit and convert to negative value.
if (rawword & 0x800) {
ref = (0xF800 | (rawword & 0x7FF))*0.0625;
} else {
// multiply for the LSB value
ref = rawword * 0.0625f;
}
Serial.println(ref);

return ref;
}

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