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Fix for below 0C measurements with nominal resistance other than 100 ohms #9

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Jan 8, 2020
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Fix for below 0C measurements with nominal resistance other than 100 ohms #9

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5 changes: 5 additions & 0 deletions adafruit_max31865.py
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,11 @@ def temperature(self):
temp = (math.sqrt(temp) + Z1) / Z4
if temp >= 0:
return temp

# For the following math to work, nominal RTD resistance must be normalized to 100 ohms
raw_reading /= self.rtd_nominal
raw_reading *= 100

rpoly = raw_reading
temp = -242.02
temp += 2.2228 * rpoly
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